Baader T Adapter (BTA) for SC and MAK Telescopes (T-2 part #21)

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T-2 Part #: 21

# 2408160

€ 56.00 Price excl. German VAT tax (19%): € 47.06

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A widefield camera adapter for all Schmidt-Cassegrain Celestron/Meade telescope tubes. Allows T-2 accessories to be used with an SCT thread.
Telescope side UNC 2" (50.8mm) nut with internal thread. Focus side T-2 external thread. Optical path length 16mm.
Short T-adapter for all SC and MAK telescopes. Wide image field ideal for mounting the Baader or Zeiss binocular to Celestron Telescopes.
Fits all Scmidt-Cassegrain 2" thread for 5/6/8/9.25/11/14 OTAs

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Product Questions

Hello. I am interested in getting the Alan Gee Telecompressor, and would like to mount it using this Baader T Adapter (T-2 part #21). However, I also have the #2956220 SC / HD-Clicklock Eyepiece clamp for my Celestron SCT 9.25. I wonder if I can attach the Alan Gee to the T-2 Part #21 and then have the #2956220 Clicklock on top of it, to make it really easy to change from visual to astrophotography applications. What are additional components that I would need to reach focus with a ZWO ASI224MC Camera?

Thank you for your help!

Question by: Carlos Labastida on Mar 23, 2018 10:15:00 PM | 1 Answer(s)

Please note that the recommended distance between Alan Gee and the field stop of an eyepiece or a camera sensor is 121mm. It should not be much further away than ca. 130mm, otherwise the quality may suffer.

The 2" SC/HD-Clicklock has got a length of 47mm, our 2"-mirrors ca 112mm, our 2" prisms about 100mm (both including their clicklock eyepiece clamps) and our 1.25"-T-2-prism 64mm incl. eyepiece clamp. So, it is okay if you use a 1.25" star diagonal, but with a 2" star diagonal, the Alan Gee will be too far away from the eyepiece.

You can use the BTA (#21) and the Expanding Ring T-2f / M48m (T-2 part #29) #2458110 (optical length: 2.5mm) to attach the Clicklock to the BTA. But we'd recommend this only for 1.25" star diagonals.

The ASI has got a backfocus of 12.5mm from the T-2-thread, so you need ca. 108.5mm of distance.

If you attach the camera *directly to the BTA*, this can be achieved e.g. with
- 2x 40mm T-2-extension tube (T-2 part #25B) #1508153
- VariLock 46, lockable T-2 ExtensionTube 29-46mm (T-2 part #25V) #2956946
This will give you a length of 109mm, or if you want the more precise, you can use
- 1x 40mm tube
- 2x 15mm tubes (#1508154)
- 1x VariLock 46
to give you 99-116mm.

If you mount the Alan Gee in *front of the Clicklock*, you need e.g.:
- Expanding Ring T-2f / M48m (T-2 part #29) #2458110 - optical length: 2.5mm
- 2" SC-Clicklock - 47mm
- Baader 2" / T-2 Nose Piece (T-2 part #16) # 2408150 - optical length: 2.5mm
- 2 x 15mm T-2-extension tube (T-2 part #25A) # 1508154 - 30mm
- Baader VariLock 29, 20-29mm (T-2 part #25Y) # 2956929 - set to 26.5mm
- ASI cam - 12.5 mm
This will give you the desired working distance of 121mm.

Answer by: Baader Web Team (Admin) on Mar 26, 2018 11:55:00 AM

You must be logged in to answer questions.

Can the T thread section be rotated relative to the SCT thread section and locked in any chosen orientation of the camera? There appears to be a locking screen (possibly even three of them) to do this but it is easy to misinterpret images on a web page.

-21

Question by: Richard Campbell on Oct 21, 2016 10:57:28 PM | 1 Answer(s)

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Specifications

Additional Information

Manufacturer	Baader Planetarium
SKU (#)	2408160
Weight (kg)	0.066
Optical tube length	15
T-2 Part #	21
Usage	SC-T photo adapter
Inner Diameter / Clear Aperture (mm)	38
Outer Diameter	56
Inner Connection (lens sided)	Thread, T-2 (M42 x 0,75), 2" (50,8mm)
Outer Connection (eyepiece/-camera-sided)	Thread, T-2 (M42 x 0,75)
Adaptable to	all male 2" SC-Gewinde from 5/6/8/11/14 OTAs
Compatible Brands	Astro T-2, Baader Planetarium, Celestron
Type of Adapter	Reducing piece

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