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Refractor (Lens)

$Robtics | Refractor Telescopen$ Een refractor is een telescoop waar aan de voorzijde een lens zit die het binnenkomende licht opvangt en door lichtbreking het licht naar een brandpunt toe brengt. Een ander woord voor lichtbreking is refractie. Andere woorden voor een refractor is lenzenkijker of lenzentelescoop. Er zijn ruwweg twee soorten refractoren; achromatische en apochromatische refractoren.

Achromatische refractoren bestaan uit een tweelenzig objectief. Achromaten kunnen last hebben van een zogenaamde kleurfout (chromatische abberatie) en dat ziet eruit als kleine regenboogjes om heldere objecten zoals de maan en heldere sterren. Dit komt omdat dit systeem niet in staat is om alle kleuren van het spectrum op exact het zelfde punt te laten samenvallen in een brandpunt. Let op: dit is niet goed en niet slecht; het is een natuurlijke eigenschap van dit ontwerp. Achromatische refractoren zijn over het algemeen prima geschikt voor visuele waarnemingen met beperkte vergrotingen. Voor fotografie zijn ze minder geschikt.

Apochromatische refractoren hebben een objectief dat bestaat uit drie of meer elementen. Hiermee is het mogelijk om al het licht wel op exact het zelfde punt te laten samenvallen in een brandpunt. We spreken dan over een kleurgecorrigeerd systeem. Apochromaten zijn goed geschikt voor visuele waarnemingen en astrofotografie.

Alle refractor telescopen hebben een gekromd beeldveld. Visueel is dat geen probleem, maar voor fotografisch gebruik moet dit worden gecorrigeerd met behulp van een optische corrector: de zogenaamde field flattener.

In deze sectie zijn alle verschillende smaken refractor telescopen terug te vinden!

Kunt u niet vinden wat u zoekt of wilt u hulp bij het selecteren van de voor u meest geschikte telescoop? Neem contact op met Robtics! We helpen u graag!

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Refractor (Lens)

Askar FRA600 F5.6 108mm quintuplet astrograph OTA

The ASKAR FRA600 is a 5-element apochromat according to Petzval with 600 mm focal length and the focal ratio f/5.6. The aperture is 108 mm. The triplet lenshas two special ED glasses for an image free of chromatic aberration. The 2-element corrector is permanently installed in the tube and corrects an image circle up to 66 mm in diameter. And a lot of...

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Refractor (Lens)

Askar SQA85 - 85mm F4.8 408mm Quintuplet Petzval Astrophotography APO

High-quality quintuplet air-spaced SD glass Petzval Astrograph. Aperture: 85mm Focal Length: 408mm Focal Ratio: F4.8 Format specification: Full Frame Optical Design: Quintuplet Petzval APO (Two pieces of SD glass) Dual speed focusing mechanism Rotating mechanism Internal 2" filter thread Extractable dew-shield Weight: 3.64 kg Carrying case

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Refractor (Lens)

Askar 60F Flat Field Quadruplet 60mm F6.8 408mm APO OTA

A compact, ultra-portable, and powerful quadruplet self-flattened Askar astrograph. The Askar 60F is an OTA with an aperture of 60mm, a focal length of 408mm, and a native focal ratio of F6.8, designed for astronomy enthusiasts who prioritize portability and high image quality. The Askar 60F features a quadruplet optical lens design, including one piece...

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Askar Guide Scope 32mm F4 - Silver

Guide Scope All-metal design Standard Finder Shoe connection Aperture: 32mm Focal length: 128mm Focal ratio: F4 Weight: 300 gram Helical focuser 20 mm travel T2 (M42x0.75) and 1.25" connections Silver

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Refractor (Lens)

Askar 130PHQ 130mm F7.7 Quadruplet Flat-Field Astrograph OTA

Askar 130PHQ is a long-focal-ratio, flatfield astrograph. Instead of buying extra flatteners, calculating the backfocus of flattener or making tedious connection to match the distance, astrophotographers can simply equip it with any possible imaging devices, make the target stay at the focus, and then the whole optical system is perfect for imaging....

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Refractor (Lens)

Askar FMA180PRO F180mm/4.5 Astrograph Lens - D40mm F5.5 triplet APO with triplet F4.5...

Askar FMA180PRO adds a finder base and a 360° rotator to the popular Askar FMA180. ASKAR FMA180PRO objective lens features Triplet air-spaced APO design including two pieces of ED (extra-low dispersion) glass, providing excellent correction of chromatic aberration which lays the foundation for high quality astrophotography and observation. The Askar...

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Refractor (Lens)

Askar 140APO 140mm F7 980mm triplet APO OTA

Whether you're an amateur astronomer or a professional astrophotographer, the Askar 140APO will provide you with a high-quality user experience and help you go deeper into the mysteries of the universe. The Askar 140APO has a triplet air-spaced APO lens design, including one piece of ED glass with140mm aperture, 980mm focal length, and F7 native focal...

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-€ 250,00

Refractor (Lens)

Askar 103APO 103mm F6.8 700mm triplet APO OTA

€ 1.340,00 € 1.590,00

After a long preparation, we launch the new Askar 103APO, dedicated to enabling more amateurs to own a high-performance astrograph and explore the mysteries of the universe to their heart's content without worrying about the price. The Askar 103APO has a triplet air-spaced APO lens design, including one piece of ED glass with 103mm aperture, 700mm focal...

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Refractor (Lens)

Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA

Askar FRA500 It boasts a quintuplet air-spaced APO optical structure, a "three plus two" Petzval lens combination. The 90mm front lens group consists of three lenses (including two pieces of ED glass) for excellent correction of aberrations. The flatfield corrector is composed of two lenses with an image circle of 55mm, at a focal length of 500 mm.

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Refractor (Lens)

Askar 65PHQ 65mm F6.4 Flatfield Quintuplet Astrograph OTA

Askar 65PHQ is a flatfield astrograph with a focal ratio of f/6.4 and a focal length of 416mm. It supports the full-frame image circle and has a fine spot diagram with tiny distortions of the peripheral stars. Aperture size: 65mm Focal length: 416mm Focal ratio: f/6.4 Objective lens: Quintuplet air-spaced APO (including two ED glasses) Image circle: 44mm

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Refractor (Lens)

Askar 71F Flat Field Quadruplet 71mm F6.9 APO OTA

Lightweight, compact, affordable, quadruplet flat-field, Astrograph which can be used for visual observing and astrophotography. The Askar 71F is an OTA with an aperture of 71mm, a focal length of 490mm, and a native focal ratio of F6.9. The Askar 71F adopts a quadruplet air-spaced APO lens design, including one piece of ED glass, which can effectively...

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Refractor (Lens)

Askar 160APO 140mm F7 1120mm triplet APO OTA

The Askar 160APO sits nicely between the Askar 140 APO and the Askar 185 APO, offering a wide aperture while maintaining portability and ease of use. The Askar 160APO has a triplet air-spaced APO lens design, including one piece of ED glass with 160mm aperture, 1120mm focal length, and F7 native focal ratio. The Askar 160APO comes with tube rings, handle,...

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-€ 85,00

Refractor (Lens)

Askar FRA300 Pro 60mm F5 300mm quintuplet astrograph OTA

€ 1.090,00 € 1.175,00

The Askar FRA300 Pro is a small but powerful 60mm F/5 Petzval astrograph. 60mm aperture, 300mm focal length at F5. The star image is sharp and delicate. At the center of its field of view, the RMS radius can reach 2um! It performs excellent with full-frame chips and supports 44mm imaging, which is a breakthrough for astrographs for amateur astronomers in...

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Refractor (Lens)

Askar SQA55 - 55mm F4.8 264mm Quintuplet Petzval Astrophotography APO

Quintuplet air-spaced SD glass Petzval astrograph, which can be used for astrophotography and daily photography. Aperture: 55mm Focal Length: 264mm Focal Ratio: F4.8 - F22 Illuminated and corrected field: 44mm Optical Design: Quintuplet Petzval (One piece of SD glass and one piece of ED glass) Dual speed focusing mechanism Dual rotating mechanism...

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Autoguiding

Askar Guide Scope 32mm F4 - Black

Guide Scope All-metal design Standard Finder Shoe connection Aperture: 32mm Focal length: 128mm Focal ratio: F4 Weight: 300 gram Helical focuser 20 mm travel T2 (M42x0.75) and 1.25" connections Black

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Refractor (Lens)

Askar FRA400 72mm F5.6 400mm quintuplet astrograph OTA

The Askar FRA400 is a 72 mm F5.6 (400mm) quintuplet astrograph which has adopted a modern optical triplet design with 2 ED lenses and a 2 ED element flattener that gives a flatfield of 44 mm.

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Askar 52mm Super ED Guide Scope - Silver

Multifunctional 52mm Guide Scope with SD glass. Optical design: doublet with one SD element Usable for photographic and visual use Aperture: 52mm Focal Length: 249mm Focal Ratio: F4.8 Weight: 740g Integrated helical focuser with 25mm travel Universal finder slot base and 1/4" and M4 threaded holes for easy attachment Included adapters: 1.25" adapter, M42...

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Refractor (Lens)

Askar SQA70 - 70mm F4.8 336mm Quintuplet Petzval Astrophotography APO

High-quality quintuplet air-spaced SD glass Petzval Astrograph. Aperture: 70mm Focal Length: 336mm Focal Ratio: F4.8 Format specification: Full Frame Optical Design: Quintuplet Petzval APO (Two pieces of SD glass) Dual speed focusing mechanism Rotating mechanism Internal 2" filter thread Extractable dew-shield Weight: 2.68 kg Carrying oxford cloth case

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Refractor (Lens)

Askar FMA180 F180mm/4.5 Astrograph Lens - D40mm F5.5 triplet APO with triplet F4.5 full...

ASKAR FMA180 objective lens features Triplet air-spaced APO design including two pieces of ED (extra-low dispersion) glass, providing excellent correction of chromatic aberration which lays the foundation for high quality astrophotography and observation. The Askar FMA180 has an aperture of 40mm, a focal length of 220mm and a focal ratio of f/5.5....

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Refractor (Lens)

Askar SQA106 - 106mm F4.8 509mm Quintuplet Petzval Astrophotography APO

High-quality quintuplet air-spaced SD glass Petzval Astrograph. Aperture: 106mm Focal Length: 509mm Focal Ratio: F4.8 Fromat specification: Full Frame Optical Design: Quintuplet Petzval APO (Two pieces of SD glass) Dual speed focusing mechanism Rotating mechanism Internal 2" filter thread Extractable dew-shield Weight: 5.82 kg Carrying case

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Autoguiding

Askar 52mm F4 Guide Scope - Black

Guide Scope All-metal design Standard Finder Shoe connection Aperture: 52mm Focal length: 208mm Focal ratio: F4 Weight: 631 gram Helical focuser T2 (M42x0.75) and 1.25" connections Black

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Refractor (Lens)

Askar 80ED - 80mm F7 doublet ED refractor OTA

Doublet refractor with one ED element 80mm aperture 560mm focal length F7 focal ratio Dual speed rack and pinion focuser Reversible dew cap Telescope rings Vixen dovetail Carry handle Optional available: field flattener, 085x and 0.7x reducers

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Refractor (Lens)

Askar FMA135 135mm f/4.5 APO flatfield Telephoto Lens (APCS format)

The ASKAR FMA135 is a 30mm ED triplet to deliver superb images. The 3 element flattener is designed for APCS format camera's and has a high quality for astronomical and terrestrial imaging. It also works as a finder/small telescope/guide scope.

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Refractor (Lens)

Askar 120APO 120mm F7 840mm triplet APO OTA

Askar APO series is dedicated to enabling more users to own a high-performance astrograph. The Askar 120APO is dedicated to enable more amateurs to own a high-performance astrograph and explore the mysteries of the universe to their heart's content without worrying about the price. The Askar 120APO has a triplet air-spaced APO lens design, including one...

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Autoguiding

Askar 52mm Super ED Guide Scope - Black

Multifunctional 52mm Guide Scope with SD glass. Optical design: doublet with one SD element Usable for photographic and visual use Aperture: 52mm Focal Length: 249mm Focal Ratio: F4.8 Weight: 740g Integrated helical focuser with 25mm travel Universal finder slot base and 1/4" and M4 threaded holes for easy attachment Included adapters: 1.25" adapter, M42...

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-€ 403,00

Refractor (Lens)

Askar V - Seven-in-one telescope - 60mm and 80mm Reduced and Extended triplet APO...

€ 1.725,00 € 2.128,00

Askar V is a newly launched product concerning our customers' needs. It comes out with a big innovation, which means it has not only two objective lens (60mm and 80mm), but also three accessories (reducer, flattener, and extender). Users can choose and adapt accessories according to their needs in focal lengths. One telescope with these functionalities:...

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Refractor (Lens)

Askar FRA400C 72mm F5.6 400mm Quintuplet APO Refractor

FRA400C Quintuplet APO Refractor Aperture: 72mm Focal Length: 400mm Focal Ratio: F5.6 - F22 44mm image circle 290mm Vixen-Style Dovetail Plate Two Finderbases M72, M54, M48 Adapters 1.25" and 2" Visual Adapters Optional 0.7x reducer available

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Refractor (Lens)

Askar 151PHQ 151mm F7 Quadruplet Flat-Field Astrograph OTA

Askar 151PHQ 151mm F7 Quadruplet Flat-Field Astrograph OTA Quadruplet Flat-Field APO design Aperture: 151mm Focal Length: 1057 Focal Ratio: F7 Weight: 13.5 kg Tube Rings Losmandy Plate Handle Photographic adapters Flight Case

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Refractor (Lens)

Askar 107PHQ 107mm F7 Flatfield Quadruplet Astrograph OTA

Askar 107PHQ, an f/7 astrograph, contains four pieces of lenses including two pieces of ED glass, which can better reduce chromatic aberration. Aperture size: 107mm Focal length: 749mm Focal ratio: f/7 Objective lens: Quadruplet air-spaced APO (including two ED glass) Image circle: 44mm Total length: 603mm（when the dew shield is contracted) 754mm（when...

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Refractor (Lens)

Askar 203APO 203mm F7 1421mm triplet APO OTA

The Askar 203APO is an OTA with 203mm aperture, 1421mm focal length and a native focal ratio of F7. The Askar 203APO has 20% larger effective aperture area than the 185APO. The large aperture provides an inherent advantage in terms of light-gathering power, resolution, brightness, and contrast, allowing the photographer to gather more light and present...

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Autoguiding

Askar 52mm F4 Guide Scope - Silver

Guide Scope All-metal design Standard Finder Shoe connection Aperture: 52mm Focal length: 208mm Focal ratio: F4 Weight: 631 gram Helical focuser T2 (M42x0.75) and 1.25" connections Silver

$Robtics Refractor (Lens)$ $Robtics Refractor (Lens) 2$

-€ 690,00

Refractor (Lens)

Askar 185APO 185mm F7 1295mm triplet APO OTA

€ 6.185,00 € 6.875,00

As a large aperture refractor, Askar 185APO fills the market vacancy, continues the high quality and cost-effectiveness of APO series telescopes, and provides a new choice for astronomical amateurs. The Askar 185APO has a triplet air-spaced APO lens design, including one piece of ED glass with 185mm aperture, 1295mm focal length, and F7 native focal...

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Refractor (Lens)

Askar 80PHQ 80mm F7.5 Flatfield Quadruplet Astrograph OTA

Askar 80PHQ is a flatfield astrograph with a focal ratio of f/7.5 and a focal length of 600mm. It supports full-frame image circle and has a fine spot diagram with tiny distortions of the peripheral stars. Aperture size: 80mm Focal length: 600mm Focal ratio: f/7.5 Objective lens: Quadruplet air-spaced APO (including two ED glasses) Image circle: 44mm

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Refractor (Lens)

Askar 91F - Flat Field Quadruplet 91mm F6.7 APO OTA

Self-flattened quadruplet Astrograph which can be used for visual observing and astrophotography. The Askar 91F is an OTA with an aperture of 91mm, a focal length of 609mm, and a native focal ratio of F6.7. The optical design of the Askar 91F features a four-element configuration (three elements in the front and one in the rear), including one piece of ED...

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