Glasspathcorrector 1:2,60 for Baader-Binoviewer

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Glasspathcorrector 1:2,60 for Baader-Binoviewer

# 2456317

€ 132.00 Price excl. German VAT tax (19%): € 110.92

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  • Glasspathcorrector Factor 2,6. Optical path length: -120 mm
  • Insert diameter: ∅ 38 mm
  • Suitable to insert into the Baader MaxBright (Classic and MaxBright® II) or Mark V Großfeld (Giant)-Binocular (#2456410 , € 1425,-)
  • A Baader Glaspathcorrector is not a Barlow lens! The reason for this name (in Germany the name Glaswegkorrektor® is a protected trademark by Baader Planetarium) is only secondly the displacement of the focal point
  • A Glaspathcorrector is primarily intended to correct the prismatic color fringing that occurs on Refractors due to the high amount of glasses used in binocular prisms
  • Please note: The Baader MaxBright® II Binoviewer with case (#2456460 , € 479,-) is the only Baader-Bino where you can choose between Zeiss ring-dovetail and T-2 thread adapter.

Product Questions and Answers

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Is it possible to stack GPC's without losing image quality?

For example, a 1,25x or 1,70 GPC on top of the 1,7x newtonian GPC with a Mark V binoviewer. That would give a nice flexibility.
Question by: Saul on Jan 18, 2017 11:53:00 PM | 1 Answer(s)

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Is it available the GPC housing alone (without the lens) ?
If yes could you inform about the part number?
Question by: Piter on Oct 20, 2020 7:54:00 PM | 1 Answer(s)

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Does this corrector affect the eye relief of my eyepieces?
I use your Zeiss 1.25 dagonal and Maxbright II binoviewer.
Thank you!
Question by: Svante on Oct 4, 2020 11:34:00 AM | 1 Answer(s)

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I understand that the optically active element of the VIP-Barlow is the 2.6x glass-path-corrector lens referenced "4C" in the T2 system. Is that correct ? If not, Is the active element for sale alone ?
Question by: David on Dec 19, 2016 5:34:00 PM | 1 Answer(s)

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Can the Baader GPC be used for mono viewing with one of the Baader t2 diagonals and a single eyepiece? Cannot replace a Barlow?
Question by: Manoj on Sep 27, 2023 7:09:00 AM | 1 Answer(s)

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Glasspathcorrector (GC) for Baader Binoviewers and more

Glasspathcorrectors for lens telescopes, Newtonians and Schmidt-Cassegrains

A glasspathcorrector fulfills two purposes: On the one hand, it removes the colour aberrations which are caused by the prisms of the binoviewer at fast telescopes, and on the other hand does it move the focus point outwards so that you can reach focus even at telescopes with little backfocus. And you can use different glasspath correctors to achieve additional magnifications without buying a second pair of eyepieces.

Baader Glaswegkorrektor (GK) Faktor 1,25

Baader Glaswegkorrektor (GK) Faktor 1,25 GC Factor 1,25 / Factor 1,70 / Factor 2,60

These three glasspathcorrectors are inserted either into the binoviewer or the T-2-prism. Which one you need depends on the available backfocus. You can find information on how to determine the backfocus of your telescope in the manuals of our binoviewers. Please also note our special 2" glasspathcorrectors for Newtonians or Lens telescopes and SCs.

The reduction of the optical length was measured with the 2" focuser of a Traveler 105mm/f6 Apochromat with a pair of 35mm ED eyepieces, the Großfeld (Giant) Binoviewer with 90° T-2 prism diagonal and the glasspathcorrectors. The measurement was done with the GC placed between prism and binoviewer. If the GC is placed in front of the prism, the optical length is reduced approximately by another 15 mm.

Optical Lengthwithout Correctorwith GC 1:1,25with GC 1:1,70with GC 1:2,60
From the contact surface of the focuser – with 90° T-2 prism  162 mm (can't reach focus) 144 mm 122 mm 79 mm
straight, with 2" nosepiece (without prism, important for Newtonians) 112 mm 94 mm 71 mm 28 mm
straight, with T-2 quick-changer 123 mm 105 mm 82 mm 39 mm

With these three lens systems, you can solve focus problems of almost all common telescope designs. The lens cell provides both a thread for the Zeiss dovetail of our Großfeld (Giant) Bino and the MaxBright® II as well as a T-2 clamping flange for MaxBright® und MaxBright® II! This flange can be clamped between the male and female threaded parts of every T-2 (M 42x0,75) threaded connection. This way, you can start to experience with many accessories which you couldn't use with your telescope before.

Baader Glaswegkorrektor (GK) Faktor 1,25
Example for the use of glasspattcorrectors with the Baader Safety Herschel prism.

Glasspathcorrector® 1:2,6

The cell of this glasspathcorrector must not be opened, because these lenses are seperately centered during manufacturing. Their distances are optimised for use as glasspathcorrector (not as Barlow lens). That's why only "lens position B" is available (cf. the information sheet to the Astro T-2 System®). The 1:2.6 glasspath corrector can be screwed into every T-2 star diagonal, so that you can use it both with Zeiss ringdovetail ot a T-2-thread. So, you can use it with all of our binoviewers.

You can also insert the 2.6x glasspathcorrector – as mentioned above – between every T-2 screw coupling with its flat rim. The flat rim must always face towards the eyepiece and the lens cell towards the telescope.

T-2 Coupling Nut (Maxbright®/Maxbright®II Binoviewer)

All glasspathcorrector are installed with the lens configuration B (lens cell points away from the binoviewer). To do so, there is enough space or a matching thread as well in the T-2 star diagonals as in the 1¼" and 2" nosepieces. To save optical length, the lenses are not inserted into the binoviewer. This way, the beam splitter inside of the binoviewer can be very close to the front of the housing.

MaxBright II Accessories

Telescopes with T-2 thread

Whenever you can't reach focus with a new accessory for your telescope, because there isn't enough backfocus, you should check if our glasspathcorrectors may be the solution. Almost every telescope manufacturer offers a T-2 adapte for his telescopes. These adapters usually are very short, because they are designed to attach to a DASLR. At exactly this place, our glasspathcorrectors are inserted! We manufacture several eyepiece adapters, spacer rings and adapters with T-2-thread, so that it is almost always possible to create a working adaption.

Camera lenses

Perhaps you still own a camera lens with T-2 thread. With many lenses by third-party manufacturers (e.g. Tokina, Soligor, Vivitar etc.) you can remove the bayonet ring and access a T-2 thread. By using a glasspathcorrector and our Variable Locking/Sliding T-2-focuser or a 1¼"/T-2 eyepiece clamp, you can use your 1¼" prism diagonal and most 1¼" eyepieces together with your camera lens!

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Additional Information

EAN Code 4047825011039
Manufacturer Baader Planetarium
SKU (#) 2456317
Net weight (kg) 0.02
Outer Connection (eyepiece/-camera-sided) M34, M42 x 0.75 (T-2)
Magnification (x) 1 : 2,60
Optical length (mm) -120
Optical Design Glaspath Corrector
compatible telescopes Refractors, Schmidt-Cassegrain, Newton

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fredydj 03/01/2021 04/01/202117:06
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Glaswegkorrektor 1:2,60
Sehr hohe Vergrößungen, mit sehr guter Qualität, möglich.
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