EXPLORE SCIENTIFIC Zero X Field Flattener 2''/M48 for ED80, ED102 and ED127 APO

Field flattener for Explore Scientific ED80, ED102 and ED127 APOCHROMATS, correcting field curvature for up to full-frame camera sensors

  • Flattener for Explore Scientific ED80, ED102 and ED127 APO telescopes
  • Removes field curvature from telescopes
  • Produces round stars even at the edge of the image field
  • Correction for up to full-frame camera sensors (24x36 mm)
  • Camera side with large M48 threaded connector
  • Image field flattener without reduction factor
  • Working distance of 55 mm between flattener and camera sensor
  • For telescopes with a focal length of approx. 480 to 952 mm and focal ratios of F=6.0 and F=7.5
  • Fully multi-coating on all lens surfaces
  • Housing made of lightweight aluminium, black anodised

£169.00*

Available, delivery time: 1-3 days

Product number: 0510380
EAN: 4007922064147
WEEE-Reg.-Nr.: DE 34323861

With BRESSER, you can enjoy a smooth introduction to the vast world of astronomy. Our detailed information ("Telescope Guide") provides valuable tips for beginners—but even experienced astronomers can use the information we provide (e.g., tables for the geographical latitude of all major world cities) as a reference.

Here is the table of contents of the comprehensive BRESSER Telescope Guide:

Sky Guides by Bresser

The Sky Guide provides comprehensive information on constellations, planetary positions, and astronomical events – perfect for planning your observations and delving deeper into astronomy.
Visit the guide directly here to make the most of your observations!
Product information "EXPLORE SCIENTIFIC Zero X Field Flattener 2''/M48 for ED80, ED102 and ED127 APO"
Field flattener without reduction factor for Explore Scientific ED80 , ED102 and ED127 APO Refractors
The imaging plane of many telescopes is not flat but curved. This means that only the area in the centre is perfectly focused - the edge becomes blurred. The human eye can usually compensate for this image property, but a camera shows increasing blurriness towards the edge of the image field. The Explore Scientific Zero X field flattener eliminates the field curvature in many telescopes with a focal length of approx. 480 to 952 mm. The Zero X field flattener was calculated and developed for Explore Scientific ED80, ED102 and ED127 apochromats with focal ratios of F=6.0 and F=7.5. The image sharpness at the edge is dramatically increased. The stars appear round and no longer distorted - a clear benefit for the whole image aesthetics. The Zero X image flattener can be used not only with Explore Scientific Apos, but also with many other Apos. This flattener does not change the focal length of the telescope.

Correction for up to full-frame camera sensors (24x36mm)
The Explore Scientific Zero X image flattener has been developed due to the rapid development of ever larger camera sensors. With it, there is finally a field flattener available that illuminates and corrects the field of view for full-frame camera sensors up to 24x36 mm.

How to use the Zero X field flattener with M48 thread connection
This field flattener has a 2 inch (50.8 mm) plug-in connection on the telescope side, with which it is inserted into the telescope instead of an eyepiece or star diagonal mirror. On the camera side, there is a standardised M48 x 0.75 mm connection thread. This M48 connection thread offers a larger free inner diameter than the usual T2 (M42) thread and prevents vignetting when using large camera sensors. With an optionally available and camera-specific adapter ring, a DSLR camera can be connected to it. The working distance is already set at 55 mm. Of course, mirrorless cameras or special astro cameras can also be used with the M48 thread connection. For this, the appropriate M48 spacer sleeves or adapters are additionally required to set the right working distance of 55 mm. This must always be done with every corrector or field flattener so that the best possible field flattening is achieved.

Filter thread on telescope side available
The telescope-side 2.0 inch plug-in sleeve has an M48x0.75 filter thread (internal thread). Individual 2.0 inch colour or nebula filters can be inserted here to increase the contrast of the images.


FEATURES
  • Field flattener for Explore Scientific ED80, ED102 and ED127 APO telescopes
  • Removes field curvature from telescopes
  • Produces round stars even at the edge of the image field
  • Image sharpness at the edge is drastically increased
  • A clear benefit for the whole image aesthetics
  • Correction of field curvature for up to full-frame camera sensors (24x36 mm)
  • Image field flattener without reduction factor
  • On the telescope side with 2 inch (50.8 mm) plug-in connection and M48x0.75mm filter thread
  • Camera side with large M48 threaded connector
  • Working distance of 55 mm between field flattener and camera sensor
  • For telescopes with a focal length of approx. 480 to 952 mm
  • Optimised for telescopes with focal ratios from F=6.0 to F=7.5
  • Can also be used for various other APOs
  • Fully multi-coating on all lens surfaces
  • Housing made of lightweight aluminium, black anodised
  • Aluminium dust cap for M48 thread


SCOPE OF DELIVERY

  • Zero X field flattener (1 piece)
  • Dust caps


Batteries required: No
Colour: black
Diameter (mm): 56
Extended warranty (years): 10
Material: Aluminium
Net Weight total (incl. accessories) (g): 200
Net weight (without access.) (g): 180
Total length (mm): 82

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Produkt- und Sicherheitshinweise


Manufacturer: 
Bresser GmbH, Gutenbergstraße 2, 46414 Rhede

Contact: 
www.bresser.de


Warning notes
  • General safety instructions DANGER Risk of eye injuries! Never look directly at the sun or near the sun through this device. There is a risk of blindness! Children should only use the device under supervision. Keep packaging materials (plastic bags, rubber bands, etc.) away from children! There is a risk of suffocation! FIRE HAZARD! Do not expose the device – especially the lenses – to direct sunlight! The light concentration could cause fires. RISK of material damage! Do not dismantle the device! In case of a defect, please contact your dealer. They will contact the service center and may send the device in for repair. Do not expose the device to temperatures above 60°C!
  • Never look at the sun through an eyepiece/telescope without a certified protection filter. A moon filter can never be used for solar observation. The moon filter is only suitable for moon observation. The solar filter must be mounted in front of the telescope opening, not at the eyepiece. Otherwise, the concentrated light beam through the optics will immediately destroy the filter foil, leading to severe eye damage, including permanent blindness.
  • Never leave the optics unattended. Children and inexperienced adults could point the telescope at the sun without proper precautions and lose their eyesight.
  • Do not expose the device to high temperatures.

Accessories

EXPLORE SCIENTIFIC Camera-Ring M48x0.75 for Canon EOS
Camera specific bayonet adapter (camera ring) for Canon EOS DSLR with M48x0.75 mm internal thread for astrophotography. By using the large thread M48x0.75 mm, the vignetting of e.g. a DSLR full format sensor is effectively avoided. Compared to the small T2 thread M42x0.75, this adapter has a free inner diameter of 47.5 mm. This camera ring is made of matt black anodised aluminium and weighs only 40 grams. The light path (overall length) is 10.0 mm. FEATURES Camera-specific bayonet adapter Canon EOS Large female thread M48x0.75 mm Free inner diameter of 47,5mm No vignetting for full format sensors Light path (overall length) is 10.0 mm Made of matt black anodized aluminium Weight only 40 grams SCOPE OF DELIVERY Camera ring for Canon EOS (1 piece)

£23.00*
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EXPLORE SCIENTIFIC Camera-Ring M48x0.75 for Nikon
Camera specific bayonet adapter (camera ring) for Nikon DSLR with M48x0.75 mm internal thread for astrophotography. By using the large thread M48x0.75 mm, the vignetting of e.g. a DSLR full format sensor is effectively avoided. Compared to the small T2 thread M42x0.75, this adapter has a free inner diameter of 41.2 mm. This camera ring is made of matt black anodised aluminium and weighs only 30 grams. The light path (overall length) is 8.0 mm. FEATURES Camera-specific bayonet adapter NikonLarge female thread M48x0.75 mm Free inner diameter of 41,2mm No vignetting for full format sensors Light path (overall length) is 8.0 mm Made of matt black anodized aluminium Weight only 30 grams SCOPE OF DELIVERY Camera ring for Nikon (1 piece)

£20.00* £24.90* (19.68% saved)
EXPLORE SCIENTIFIC Extension Ring Set M48x0.75 - 5 pieces (30, 20, 15, 10 and 5 mm)
Five extension tubes from 30 to 5mm length with thread connection M48x0,75mm in a set. For adjusting different distances of the camera to the focal plane of the telescope or the corrector/field flattener. There is an M48.0,75 internal and external thread in each individual tube. The M48x0.75 thread is also called large T2 photo thread or 2.0 inch filter thread. Camera specific bayonet adapters or color and nebula filters can be used. Included are 5 different tubes with the steps 30, 20, 15, 10 and 5 mm. The larger free inner diameter of 45.0 mm effectively prevents undesired vignetting of the camera sensor. The outer diameter of the sleeves is exactly 50.65 mm and can therefore be mounted directly in any 2 inch diameter eyepiece adapter. FEATURES Extension sleeves M48x0,75 in set Five extension sleeves: 30, 20, 15, 10, 5 mm Use with correctors and field flatteners Distance adjustment from camera to focal plane Suitable for camera-specific bayonet adapters Also suitable for 2.0 inch colour and nebular filters Internal and external thread M48x0.75 mm (large T2 thread) Large inner diameter of 45.0 mm Outer diameter is 50.65 mm (2 inches) Black matt anodized aluminium Total weight 85 grams SCOPE OF DELIVERY Extension sleeves M48x0.75 (5 pieces)

£51.00*
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EXPLORE SCIENTIFIC T2 Reduction Adapter M48x0.75 to M42x0.75
For connecting T2 camera accessories with the smaller M42x0.75 thread to the larger M48x0.75 thread. Also ideal for adapting 2 inch colour and nebula filters between camera and telescope. FEATURES Connection of accessories with different T2 thread sizes Adaptation of 2 inch color and nebula filters between camera and telescope Internal thread M48x0.75 mm (large T2 thread) External thread M42x0.75 mm (small T2 thread) Free inner diameter of 39.0 mm Outer diameter is 50.65 mm (2 inches) Black matt anodized aluminium Weight is only 10 grams SCOPE OF DELIVERY Reduction adapter (1 piece)

£20.00* £24.90* (19.68% saved)
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EXPLORE SCIENTIFIC OPTOLONG 2'' L-eXtreme Deep-Sky Light Pollution Filter
L-eXtreme Filter for deep sky nebula photography from the city The relentless spread or urbanization and its associated light pollution have become a growing problem for all amateur astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel. Especially with inexpensive but fast newtonian telescopes, double-lens ED refractors or even achromats, the L-eXtreme filters open up completely new possibilities for high-class astronomical images even from the light polluted city. CMOS cameras can deliver images like monochrome cameras. This new generation of filters makes it possible to take amazing astrophotos directly from the heavily light-polluted city with all its artificial light sources. The dual narrow bandpass for the wavelengths of O-III and H-Alpha and the almost complete attenuation of the interfering light sources of these new filters make this an ideal solution. L-eXtreme Description L-eXtreme is a two 7nm narrow bandpass filter which can be used with one-shot color cameras like DSLRs (digital SLR), color CMOS and monochrome CCD cameras. The convenience and cost-effectiveness of this filter allows amateurs to photograph rich emission nebulas, even in bright, heavily light-polluted skies. The L-eXtreme filter is the better choice for fast optical systems at a competitive price. It isolates the H-Alpha and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae are maximized. The design of our L-eNhance filter is a technical innovation among filters. For people who live in heavily light polluted areas or when the moon is out, the L-eXtreme is a very good choice. Main Use and Performance This new generation of filters makes it possible to take amazing astrophotos directly from the light-polluted city with all its artificial light sources. The narrow bandpass for the wavelengths of O-III and H-Alpha and the almost complete attenuation of the interfering light sources do not require very large or extremely expensive telescopes. No, especially with inexpensive but fast newtonian telescopes, double-lens ED refractors or even achromats, these filters open up completely new possibilities for high-class astronomical images. Furthermore, with these filters CMOS colour cameras can deliver an image quality that comes close to CCD monochrome cameras. WARNING: These nebula filters are not designed for sun observation. DO NOT LOOK AT THE SUN WITH THIS FILTER. You will go BLIND if you ignore this warning. Coating technology L-eXtreme has a multiple anti-reflective coating on the optical substrate. The L-eXtreme filter uses a precision coating based on ion deposition coating technology. This ensures durability and scratch resistance as well as stability on the CWL (central wavelength), which is not affected by temperature changes. Absolute precision and homogeneity of the coatings as well as maximum values for transmission in the passband and optical density in the off-band range are guaranteed for all filters.  FEATURESProfessional photographic filter for astronomyImproves deep sky emission nebula photography Best choice for extreme light pollution suppression For taking pictures also from highly light-polluted areas Dual-narrow-band filter with high transmission for O-III and H-Alpha linesDoes not require very large or extremely expensive telescopesExcellent results also with fast inexpensive newtonian telescopes, double-lens ED refractors or even achromatsL-eXtreme filter is the better choice for fast systems at a competitive priceCMOS colour cameras can deliver an image quality that comes close to CCD monochrome cameras Filter diameter: 2.0 inches / 50.8 mmConnecting thread: M48x0.75mmSelected optical glass material Spectrum: 300-1000nm Off-Band Blocking: > 99 % Surface Quality: 60/40 (Refer to MIL-O-13830) Fine-optically polished to ensure accurate 1/4 wavefront and highest parallelism over the both surfacesHigh transmission at major nebula emission lines (i.e. H-alpha 656nm and OIII 496nm&500nm)SCOPE OF DELIVERY L-eXtreme filter (1 pc) Dust protection box (1 pc)

£255.00* £319.00* (20.06% saved)

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EXPLORE SCIENTIFIC Camera-Ring M48x0.75 for Canon EOS
Camera specific bayonet adapter (camera ring) for Canon EOS DSLR with M48x0.75 mm internal thread for astrophotography. By using the large thread M48x0.75 mm, the vignetting of e.g. a DSLR full format sensor is effectively avoided. Compared to the small T2 thread M42x0.75, this adapter has a free inner diameter of 47.5 mm. This camera ring is made of matt black anodised aluminium and weighs only 40 grams. The light path (overall length) is 10.0 mm. FEATURES Camera-specific bayonet adapter Canon EOS Large female thread M48x0.75 mm Free inner diameter of 47,5mm No vignetting for full format sensors Light path (overall length) is 10.0 mm Made of matt black anodized aluminium Weight only 40 grams SCOPE OF DELIVERY Camera ring for Canon EOS (1 piece)

£23.00*
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EXPLORE SCIENTIFIC ED80 APO iEXOS-100 PMC-Eight GoTo Telescope Set
This set, consisting of a high-quality 80 mm ED apochromat and modern EXOS-100 PMC-Eight mount, provides a powerful setup that will make your stargazing experiences unforgettable! The compact telescope, with a 480 mm focal length, impresses with its triple-element design and Hoya FCD01-ED special glass, delivering razor-sharp images and superior optical performance. The iEXOS-100 mount with the PMC-Eight™ GoTo system allows for precise tracking and intuitive control through the ExploreStars app. Also included is a 62° LER eyepiece with 20 mm focal length and argon filling, as well as an excellent 8x50 illuminated finder with an upright image. This is a superb telescope set for both visual and photographic sky explorations at the highest level! The Telescope The triple-element ED special glass apochromats from EXPLORE SCIENTIFIC offer everything an amateur astronomer could wish for—and all at a moderate price. The triple-element design with Hoya FCD01 ED special glass and two air spaces delivers correction far superior to the two-element ED apochromats that are typically available in this price range.A calculated Polystrehl of over 0.9 clearly stands out compared to the 0.8x achievable with two lenses. This superior optical performance, combined with a solid mechanical build, leaves nothing to be desired. Additionally, for photography, a field flattener is available as optional accessory, making the instrument fully suitable for astrophotography.The tube length has been optimized so that accessories with a critical focal position can also be used. In all EXPLORE SCIENTIFIC ED apochromats, a triplet lens with air space and Hoya FCD-1 special glass ensures excellent performance for both visual and photographic use. The Mount The iEXOS-100 is a high-quality astronomical telescope mount with a practical Wi-Fi GoTo function and the revolutionary EXPLORE SCIENTIFIC PMC-Eight™ tracking system. This makes navigating the night sky, finding objects, and precise tracking particularly easy. Control is via the free ExploreStars app, available for Windows, Android, and iOS, offering convenient operation from your laptop or tablet. Additionally, the free ASCOM POTH client from EXPLORE SCIENTIFIC is available for download, allowing compatibility with almost any sky software that supports the ASCOM standard. Accurate tracking and intuitive control The German equatorial design of the iEXOS-100 enables accurate tracking, allowing observers to keep an object centred in the eyepiece for long periods. This helps astrophotographers to overcome typical challenges in long-exposure photography, such as field rotation or star trails. The unique strength of the PMC-Eight™ system lies in its eight independently operating CPUs. This provides excellent responsiveness, efficiency, and precise tracking to compensate for Earth’s rotation. The intuitive user interface of the ExploreStars app makes telescope alignment and navigation of the night sky easier, delivering interesting information on tens of thousands of celestial objects, which are regularly updated. Versatile equipment for easy, universal use Additional benefits of the mount include ergonomic and easy-to-use axis clamps, a stepless fine adjustment for polar height, and a polar alignment tunnel for quick polar alignment with Polaris. A built-in bubble level helps with tripod levelling. Several fluorescent elements on parts of the mount and tripod make it easier to operate in the dark. The attachment of optics is via a standard GP dovetail, making the iEXOS-100 a universally usable mount. FEATURES TELESCOPE Triple-element ED air-spaced apochromat Hoya FCD01 ED special glass Polystrehl over 0.9 Lens diameter: 80 mm / Focal length: 480 mm / f/6 Weight: 2.6 kg Focal position: 165 mm from the connection FEATURES MOUNT Integrated EXPLORE SCIENTIFIC PMC-Eight™ Wi-Fi GoTo system User-friendly and visually appealing ExploreStars OpenGoto app Wi-Fi control via tablet, notebook or desktop PC with at least 7" display and Wi-Fi function (not included) Compatible operating systems: WIN8.1, WIN10/11, iOS or Android 4.4 and higher Classic control with directional buttons or virtual joystick for guiding, centring, correcting, and slewing via touchscreen Intuitive 2-star and 3-star alignment for GoTo setup Polar alignment tunnel for rough polar alignment Standard dovetail mount (Vixen-style) for attaching telescope/camera Multiprocessor microcontroller with 8 CPUs Microstep motors and worm gears on both axes Quiet belt drive Mini-USB interface for INDI/ASCOM wired PC connection ST-4 compatible autoguider port INDI and ASCOM drivers available, supports pulse-guiding Option to create and load your own firmware and object lists into the PMC-8 GPS compatible / Settings dependent on the computer or tablet used Fluorescent elements on the mount and tripod Weight of tripod head: 4.0 kg; Weight of tripod: 2.5 kg Load capacity: up to 5 kg total weight SCOPE OF DELIVERY Optical tube 2" star diagonal mirror, 99% reflection Dovetail bar & universal finder shoe Dust caps for lens & focuser 8x50 finder (illuminated, upright image) 62° LER eyepiece, 20 mm argon-filled iEXOS-100 mount with OpenGoTo PMC-8 Stainless steel tripod with built-in bubble level 3x counterweights, 1.0 kg each Spiral cable for DEC motor 12V battery compartment with holder (8 x C batteries not included) Fluorescent elements on mount and tripod ExploreStars app available via free software download User manual

£1,298.00* £1,611.00* (19.43% saved)
EXPLORE SCIENTIFIC ED APO 80mm f/6 FCD-100 Alu HEX
Highly corrected 80mm air-spaced triplet apochromat (with three lenses) and aluminium tube and a 2.5" high-precision HEXAFOC focuser.   Apochromats are the ultimate choice in small to medium sized telescopes: the combination of compactness, transportability, very high image contrast and sharpness together with the possibility to make excellent astrophotos cannot be bested. The advances in glass manufacturing during the last few years have made true apochromats available to more astronomy enthusiasts than ever before. The new Explore Scientific FCD-100 Alu Hex represents another major improvement in this field - the overall correction (color and spherical) is setting new standards in this price class. The optical design shows a polystrehl value of 0,97 indicating a level of correction that is absolutely top of the line.This small excellent apochromat is a very versatile telescope: the fast f-ratio makes short exposure times possible. The high contrast and sharpness of the image provide breathtaking views of large objects like the North america nebula or the Andromeda galaxy as well as tack sharp planetary images. The telescope is lightweight and compact - the dew shield slides down the tube to minimize size for transportation. Revolutionary glass and precision manufacturing created a telescope that offers observing joy on the highest level. This does not only qualify this telescope as the ideal travel scope, it is also the perfect choice for fast observations and for astrophotography. The excellent 2,5" HEXAFOC focuser with 10:1 reduction is perfect for this - the large inner diameter of 65mm prevents vignetting by the focuser when the telescope is used for astrophotography with large sensors.These very popular EXPLORE SCIENTIFIC Triplet ED APO Refractors we do offer in 3 different product lines:Essential Line: HOYA FCD-1 Glass lens, AL-Tube, 2.0" Rack&Pinion Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112084(AL), 0112106(AL), 0112132(AL)), 0112155(CF + 3"FT)) Professional Line: HOYA FCD-100 Glas lens, AL/CF-Tube, 2.5" HEXAFOC Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112086(AL), 0112108(AL), 0112109(CF), 0112134(AL), 0112135(CF))High-End Line: OHARA FPL-53 Glass lens, Carbon(CF) Tube, 3.0" Feather-Touch Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112165(CF))SPECIFICATIONSAperture: 80mmFocal Length: 480mmFocal ratio: f/6Weigth: 2,6kgBackfocus: 150mm above 2" adaptorDesign: Apochromat with three lenses, two air spaces and FCD-100 glassSCOPE OF DELIVERY Optical tube with retractable dew-shield 2.5" HEX focuser with 1:10 gear reduction 2" Star Diagonal 99% reflectivity Universal dovetail - GP levelDust caps for front-lens and focuser Universal finder slot

£1,178.00*
EXPLORE SCIENTIFIC ED APO 80mm f/6 FCD-1 Alu 2" R&P Focuser
The three-lens design of the EXPLORE SCIENTIFIC ED-Apochromats provides everything an amateur astronomer desires - at a reasonable price. The construction with Hoya FCD-1 ED glass has two air spaces and provides a level of correction so superior to the two-lens constructions, that are common in this price class, that you will see the difference immediately. This excellent optical performance teams up with a high precision mechanics - the result is a telescope on a level that is setting a new standard in it´s price class. Astrophotographers will love this telescope - a optional field flattner is available and makes the telescope perfect even for cameras with a large chip format.These very popular EXPLORE SCIENTIFIC Triplet ED APO Refractors we do offer in 3 different product lines:Essential Line: HOYA FCD-1 Glass lens, AL-Tube, 2.0" Rack&Pinion Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112084(AL), 0112106(AL), 0112132(AL)), 0112155(CF + 3"FT)) Professional Line: HOYA FCD-100 Glas lens, AL/CF-Tube, 2.5" HEXAFOC Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112086(AL), 0112108(AL), 0112109(CF), 0112134(AL), 0112135(CF))High-End Line: OHARA FPL-53 Glass lens, Carbon(CF) Tube, 3.0" Feather-Touch Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112165(CF))FEATURESthree lens air-spaced ED-apochromatHoya FCD01-ED glasspolystrehl of above 0.9weight: 2,6kgbackfocus: 165mm above 2" adaptorSCOPE OF DELIVERYOptics with dovetail plate and finder slot 2" Star Diagonal 99% reflectivityDust caps for front-lens and focuser

£753.00*

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Vixen adjustment shaft, 300 mm, flexible
300 mm adjustment shaft with flexible design for comfortable observations with the Porta II and the Mini Porta.The large adjustment knobs allow you to make smooth, fine adjustments to the axles.Also compatible with a wide range of other mounts from other manufacturers.FEATURESComfortable tracking by handLarge adjustment knobs for fine tuningDesigned for wide range of mountsLength: 300 mmDELIVERY CONTENT300 mm adjustment shaft

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EXPLORE SCIENTIFIC 82° Ar Eyepiece 18mm (2")
Explore Scientific 82° Series™ extreme wide field eyepieces are optimized to produce high contrast, high resolution, and superior flat field characteristics. The visual effect of these eyepieces with their long eye-relief and their 82° apparent field is truly a full-immersion experience. Your eye is relaxed, allowing you to easily use the "averted vision" technique to study faint details across a huge field-of-view. The 82° Series eyepieces come with a twist-up rubber eye-guard that raise to the desired height for the comfort of the observer, and as experienced astronomers know, eye comfort is critical when trying to observe at the visual limits of the telescope. To keep internal reflections to a minimum, all internal surfaces of the eyepiece barrel are flat black, as well as the edges of the lenses themselves to minimize the scattering of light within the lenses themselves. All 82° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.

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LUNT B3400 Blocking-Filter in 2 inch extension tube
Blocking-filter in straight extension tube, for telescopes up to 3060mm focal length. Can only be used together with a LUNT H-alpha filter, or with a LUNT H-alpha telescope!Lunt Solar Systems offers blocking-filters in different sizes, and alternatively in 90° star-diagonal housings or straight extension tubes. You can choose what blocking-filter you will use at your LUNT H-alpha Etalon system.The B3400 is installed in a straight extension tube, for 2 inch (50.8mm) focuser on the telescope side, and with 2 inch eyepiece connection and 1.25 inch (31.7mm) adapter on the eyepiece side. The B3400 can be used at LUNT H-alpha systems, if the used telescope has up to 3060mm focal length.The blocking-filter can not be used without additional H-alpha filter system from Lunt Solar Systems! Blocking-filters are absolutely required for the safety and performance of H-alpha telescopes for solar observing. Lunt Solar Systems blocking-filters contain a unique filter system. We can only warranty safety or performance, if blocking-filter is paired with a H-alpha filter or H-alpha telescope of Lunt Solar Systems.At the tab "Accessories" you will find H-Alpha telescopes and filters with which this blocking filter can be combined.FEATURESBlocking-filter only usable at additional H-alpha filter systemFilter diameter: 34mmUsable at telescopes up to 3060mm focalIn straight extension tubeFor 2 inch focuserConnection for 2 inch eyepiecesAdapter for 1.25 inch eyepiecesSCOPE OF DELIVERYBlocking-filter B3400 in 2 inch straight extension tubeAdapter for 1.25 inch eyepieces

£3,498.00*