Telescope-Service: Baader Adaptors

Adaptors

Baader Planetarium offers a very broad range of adaptors for nearly all applications. With the right adaptors it is often possible to solve even tricky problems.

Telescope-Service carries Baader's entire adaptor range. On this site we have listed the most important ones.

How to Order

Adaptors are quite tricky. Most adaptors exist both ways - e.g. an adaptor with T2 male thread on one side and SC female on the other side, as well as an adaptor with SC male on the one side and T2 female on the other side.

As a consequence of this misunderstandings often occur.

We always list all adaptors starting with the telescope adaptation and last with the eyepiece / camera side. Example: The adaptor T2 - 1.25" has a T2 thread on the side of the telescope and 1.25" on the side of the eyepiece. Opposite: The adaptor 1.25" - T2 has a 1.25" barrel on the side of the telescope and T2 on the side of the eyepiece / camera.

If you are not perfectly sure which adaptor is the right one please send a request by E-Mail! We will then help you with the adaptation.

Standard Adaptor List
Smaller than 1.25"	1.25"	M36.4	T2	M43
All adaptors with threads or barrels smaller than 1.25" (31.7mm)	All adaptors with 1.25" (male) barrel at the telescope side.	All adaptors with M36.4 Vixen thread (male or female) at the telescope side.	All adaptors with T2 thread (male or female) at the telescope side.	All adaptors with M43 thread (male or female) at the telescope side.

M44	2" Barrel	SC (2") Thread	Larger Than SC	OPFA
All adaptors with M44 Zeiss thread (male or female) at the telescope side.	All adaptors with 2" (male) barrel at the telescope side.	All adaptors with SC thread (male or female) at the telescope side.	All other adaptors with threads or barrels larger than SC (50.8mm)	Eyepiece Projection and Focal Adaptors

Short number	Order number	Short description	Effective length	Telescope Connection	Eyepiece / Camera Connection	Price - Euros incl. VAT
	BA 2404302	24.5mm barrel for 1.25" eyepieces with male M28.5 thread Further Information	6mm	24.5mm barrel	M28.5 female	12.50

10	BA 2408191	1.25" on 24.5mm reducer	6.5mm	1.25" barrel	24.5mm female	23.-
5	BA 1905130	Screw-in type extension tube 1.25" Further Information	18.5mm	1.25" barrel with M28.5 female	M28.5 male	12.-
14	BA 2458105	1.25" nose piece with T2 male thread	0.5mm	1.25" barrel	T2 male	18.-
30	BA 1901531	1.25" CCD locking ring - can be attached to a 1.25" barrel for reproducing the same focal plane. Further Information	5mm or more	1.25" female	1.25" female	15.-

11	BA 2408195	1.25" visual back for Vixen M36.4 thread	27mm	M36.4 male	1.25" female	24.-
3	BA 1508039	T2 focal adaptor for M36.4 Vixen thread	0.5mm	M36.4 male	T2 male	16.50

8	BA 2458100	CLICK LOCK 1.25" visual back + microfocuser with T2 female thread Further Information	25 - 29mm	T2 female	1.25" female with self-centering clamp mechanism	68.-
8A	BA 2458125	1.25" visual back + microfocuser with T2 female thread Further Information	28 - 34mm	T2 female	1.25" female with compression ring and 3 screws	34.-
	BA 2458120	1.25" visual back with T2 female thread Further Information	25mm	T2 female	1.25" female with one locking screw	18.-
24	BA 2458010	T2 pull-out focuser. Variable extension with 1.25" clamp. Often used for variable eyepiece projection adaptors. Further Information	27.5 - 38.5mm	T2 female	1.25" female + T2 male	26.-
25C	BA T2V 7	T2 extension tube 7.5mm Link to our Online Shop	7.5mm	T2 female	T2 male	12.-
25A	BA T2V 15	T2 extension tube 15mm Link to our Online Shop	15mm	T2 female	T2 male	13.-
25B	BA T2V 40	T2 extension tube 40mm Link to our Online Shop	40mm	T2 female	T2 male	15.-
33	BA 2958130	Variable T2 extension tube. 6-12mm extension. Consists of parts no. 26, 34 and 35	6-12mm	T2 female	T2 male	32.-
6/7	BA 2456321	Complete T2 quick changer and 360° rotation device. Consists of parts 6 + 7 Further Information	15mm	T2 female	T2 male	38.-
6	BA 2456313	T2 quick changer - base part with Zeiss micro bayonet Further Information	11mm	T2 female	Zeiss bayonet	25.-
7	BA 2456320	T2 quick changer - with Zeiss dovetail. Fits part no. 6 Further Information	4mm	Zeiss dovetail	T2 male	21.-
34	BA 2958110	T2 converter - permanent T2 female thread	10mm	T2 female	T2 female	17.-
35	BA 2958120	T2 locking ring	6mm	T2 female	T2 female	12.-
9	BA 1508041	M44 adaptor (female threads) for attaching Zeiss accessories to T2 threads	14mm	T2 female	M44 female	20.-
29	BA 2458110	Adaptor T2 female to M48 (2" filter thread) male Further Information	2.5mm	T2 female	M48x0.75 male	16.-
28	BA 2408135	Adaptor T2 female to SC thread male	5mm	T2 female	SC thread male	24.-
26	BA 1508025	T2 converter - permanent T2 male thread	0 - 10mm	T2 male	T2 male	16.-
31	BA 1508030	T2 converter - permanent T2 male thread with additional M28.5 filter thread (female)	0 - 10mm	T2 male, M28.5 female	T2 male	25.-
23	BA 1508015	Russian camera adaptor Further Information	7mm	M42x1 female	T2 male	21.-

12	BA 2458199	T2 adaptation for Takahashi Further Information	0.8mm	M43x0.75 male	T2 male	24.-
22	BA 1508037	T2 adaptor for Vixen M43 thread	2.5mm	M43x1 male	T2 male	20.50

13	BA 1508005	T2 adaptation for Zeiss M44	5mm	M44x1 male	T2 male	29.-

	2z Konter	2" CCD locking ring - can be attached to a 1.25" barrel for reproducing the same focal plane. Further Information	5mm	2" female	2" female	19.-
15	BA 2408190	2" on 1.25" adaptor. Additional threads: Telescope side M48 female, T2 female, M34 female. Eyepiece side: T2 male Further Information	9mm	2" barrel	1.25" female with compression ring	38.-
16	BA 2408150	focal adaptor 2" on T2 Further Information	2mm	2" barrel, T2 female	T2 male	25.50
19	BA 2408155	2" chrome sleeve with SC male thread Further Information	0mm	2" barrel, M48 female	SC thread male	25.-

27	BA 1508035	SC - T2 adaptor (male - male) Further Information	0.5mm	SC thread male, M48 female	T2 male	24.-
	BA 1508020	SC converter with permanent SC male thread and M48 female thread on one side	0-10mm	SC thread male, M48 female	SC thread male	19.-
21	BA 2958500B	focal adaptor SC Further Information	10mm	SC thread female	T2 male	23.-
17C	BA 2958143	SC converter Further Information	6mm	SC thread female, M58 male	SC thread female, M58 male	10.-
17	BA 2408140	2" visual back with compression ring, SC female thread	53mm	SC thread female	2" female	49.-

17A	BA 2958141	2" visual back with compression ring, M58 female thread. Usually combined with no. 17B or 17C Further Information.	53mm	M58 female	2" female	42.-
17B	BA 2958142	SC female adaptor for no. 17A, with M48 filter thread inside Further Information	0mm	M58 male, SC thread female	M58 male, M48 female	13.-
17C	BA 2958143	SC female adaptor for no. 17A Further Information	0mm	M58 male, SC thread female	M58 male, SC thread female	10.-
	BA 2458190	Four in One visual back, M60 + M68 male connection Further Information	18mm	M68 male, M60 male, M56 female	2" female with compression ring, M68 male	66.-
18	BA 2408145	Adaptor between large Celestron SC thread (C11 and C14) and adaptor no. 17 or 17A	20mm	3.3" female SC thread	Connector for part no. 17 or 17a	38.-

Please send requests or online orders to: sales@telescope-service.com

Separate Adaptor Presentations

24.5mm barrel for TS Super Plossls (and similar eyepieces)

Many amateurs own older telescopes with 24.5mm focuser. The telescopes themselves often have a good optical quality, but many 24.5mm eyepieces don't have such a good quality.

We now have a solution for this problem: This 24.5mm barrel can be attached to all TS Super Plossls up to 25mm focal length instead of the 1.25" barrel. The effective mechanical length is minimal - only about 6mm.

The adaptor also fits many other eyepieces. The eyepieces only need to have an M28.5 male thread when you remove the 1.25" barrel.

BA 2404302

24.5mm barrel. Used to refit 1.25" eyepieces for use with 24.5mm focusers. The eyepieces must have a male M28.5 thread when you remove the 1.25" barrel

0mm

24.5mm barrel

28.5mm female thread

12.50

Please send requests or online orders to: sales@telescope-service.com

Screw-In Type Extension Tube for 1.25" Barrels .... BA 1905130

This adaptor has two main applications:
1) If the focal plane of your telescope lies only a few millimetres too far outside then this adaptor solves the problem. You can screw it into the 1.25" barrel of your eyepiece or camera and then pull out the setup a few millimetres.

2) If you increase the distance between a focal reducer or glass path corrector on the one side and an eyepiece, binoviewer etc. on the other side you will enhance the factor of this corrector. Example: The standard 0.5x reducer will perform approximately as 0.3x reducer when used with this adaptor.

BA 1905130

Screw-in type extension tube 1.25"

18.5mm

1.25" barrel with M28.5 female

M28.5 male

12.-

Please send requests or online orders to: sales@telescope-service.com

	1.25" CCD Locking Ring .... BA 1905131 This parfocalizing ring is very convenient for reproducing the same focal plane quickly. For example if you are using an eyepiece to center an object and then insert the CCD camera you want to avoid having to refocus all the time. With the 1.25" CCD Locking Ring you can bring the camera and the eyepiece to the same focal plane.

BA 1901531

1.25" CCD Lockin Ring for reproducing the same focal plane.

5mm or more

1.25" female

15.-

Please send requests or online orders to: sales@telescope-service.com

	T2 Pull-Out Focuser for 1.25" Eyepieces .... BA 2458010 The Pull-Out Focuser can be used with 1.25" eyepieces. On the side of the telescope it has a T2 female thread. The eyepiece itself also sits in a fixed position. But the T2 male thread on the eyepiece side can be pulled out for a variable projection distance (eyepiece projection).

BA 2458010

T2 Pull-Out Focuser
for 1.25" eyepieces, with additional T2 male thread at the eyepiece side

27.5 - 38.5mm

T2 female

1.25" male + T2 male

26.-

Please send requests or online orders to: sales@telescope-service.com

T2 Quick Change Ring (left) and Quick Changer Base (right)

T2 Quick Changer and 360° Rotator .... BA 2456321

You probably know the situation: You have several different adaptations, and whenever you want to exchange them you need to unscrew everything. This costs time and on the long run it will even ruin the threads of the adaptors.

The T2 Quick Changer is the solution: You can place it on all parts that need to be changed frequently. With its short length of only 15mm you will usually not get a focus problem.

As a nice second function you can rotate your gear by 360° - instead of the random orientation that you get when you screw on the parts the conventional way.

6/7	BA 2456321	Complete T2 quick changer and 360° rotator Consists of parts no. 6 + 7	15mm	T2 female	T2 male	38.-

6	BA 2456313	T2 quick changer base part with Zeiss micro bayonet	11mm	T2 female	female Zeiss bayonet	25.-

7	BA 2456320	T2 quick changer second part with Zeiss dovetail and T2 male	4mm	Zeiss dovetail	T2 male	21.-

Please send requests or online orders to: sales@telescope-service.com

Click-Lock Deluxe 1.25" Eyepiece Clamp and Microfocuser .... BA 2458100

This high precision adaptor serves several purposes at once

- precisely holding heavy accessories. Two cylinders are pressed against the 1.25" barrel from the side. This centers the barrel and prevents it from shifting even by small amounts.
- small-distance microfocusing function. You can finely focus the eyepiece or camera by turning the outer ring. With one 360° turn the focus motion is only 0.75mm! The eyepiece will not rotate when you use this microfocus function. (Important: The focus motion only works from inside to outside, not the other way around. This may limit its usefulness for some applications.)

BA 2458100

Click-Lock 1.25" Visual Back with self-centering clamp mechanism. With microfocusing function.

25 - 29mm

T2 female

1.25" female

68.-

Please send requests or online orders to: sales@telescope-service.com

The Microfocuser is particularly easy to use ... ... by just turning the upper part of the adaptor you move the eyepiece in or out. A complete 360° turn will result in about 4mm focus motion. The eyepiece will be rotated as you focus it. For this reason we do not recommend this adaptor for use with cameras.	1.25" Visual Back & Microfocuser with Compression Ring .. BA 2458125 Yet another perfect adaptor made by Baader. This adaptor doubles as T2 on 1.25" visual back and as 1.25" microfocuser. The eyepiece is held firmly with a compression ring and three locking screws. Functions of the 1.25" Visual Back & Microfocuser: -- Precise and smooth focusing -- Avoid the typical image shift of a Schmidt-Cassegrain. You can use the primary mirror focus mechanism for just approximating the focus and do the actual fine focusing with this adaptor. -- Solid 1.25" clamp with compression ring and three screws.

Recommended Adaptations: The visual back has a T2 female thread at the telescope side. Adaptations exist for most common telescopes: -- 2" on T2 nose piece. To use the T2 microfocuser in a 2" standard focuser ................... Further Information -- 1.25" on T2 nose piece. To use the T2 microfocuser in a 1.25" standard focuser. Part No. 14 (BA 2458105) in the above table. -- SC on T2 adaptor. To use the T2 microfocuser on a Schmidt-Cassegrain. Part No. 21 (BA 2408160) in the above table.

BA 2458125

Adapter von T2 auf 1,25"
mit Ringklemmung, 3 Schrauben und Mikro Feinfokussierung - Ringklemmung - 6mm Hub

28mm bis
34mm

T-2 innen

1,25" innen

34.-

Please send requests or online orders to: sales@telescope-service.com

Russian Camera Adaptor - M42x1 on T2	Russian Camera Adaptor - M42x1 female, T2 male .... BA 1508015 With an optical length of only 7mm the Russian camera adaptor is a good solution to attach T2 accessories to classical M42 lenses. Suitable lenses are the MTO lenses for example. If you want to attach SLR cameras, want to use a star diagonal or other accessories that require a lot of back focus please first make sure that you can remove the infinity focus lock on your lens!
	Standard T2 on 1.25" Visual Back .... BA 2458120 A standard adaptor if you want to attach 1.25" accessories to an adaptor or telescope with T2 male thread. The adaptor uses a single locking screw. This is normally absolutely sufficient, but demanding users might want to consider the Click-Lock instead.

23	BA 1508015	Russian Camera Adaptor - M42x1 female, T2 male	7mm	M42x1 female	T2 male	21.-

	BA 2458120	Standard T2 on 1.25" Visual Back with one locking screw	25mm	T2 female	1.25" female with one locking screw	18.-

Please send requests or online orders to: sales@telescope-service.com

	Adaptor T2 female to M48 (2" filter thread) male ... BA 2458110 An often used adaptor to attach other adaptors to the 2" filter thread.

BA 2458110

T2 female to M48 male adaptor (M48x0.75 male = 2" filter thread)

2.5mm

T2 female

M48x0.75 male

16.-

Please send requests or online orders to: sales@telescope-service.com

Takahashi T2 Focal Adaptor - M43x0.75 male - T2 male .... BA 2458199

This adaptor allows you to use T2 accessories (e.g. binoviewers, T2 star diagonals, T2 on 1.25" visual backs, ...) on the Takahashi M43 thread.

The adaptor has practically no effective length, so you can often avoid focus problems that would appear with other adaptations.

The adaptor has a female M34 thread which allows you to use Baader glass path correctors.

BA 2458199

Takahashi T2 Focal Adaptor - very short optical length

0.8mm

M43x0.75 male

T2 male

24.-

Please send requests or online orders to: sales@telescope-service.com

	Ultra-Short Adaptor SC male - T2 male Compatible with many 2" star diagonals, e.g. the Baader Maxbright, the TS dielectric diagonal, ... The adaptor offers a shorter adaptation to avoid focus problems.

BA 1508035

Adaptor SC male - T2 male
with additional 2" filter thread inside

0.5mm

SC thread male, M48 female

T2 male

24.-

Please send requests or online orders to: sales@telescope-service.com

2" Parfocalizing Ring

This parfocalizing ring fits on normal 2" barrels of eyepieces, adaptors, ... The ring is locked with two slug screws (at 120° angle). The length is only about 5mm to avoid focus problems.

Applications - Solutions - Examples:

A frequent problem appears if eyepieces (or other accessories) with safety undercut are to be held by eyepiece clamps with compression ring. Then it is possible that the compression ring gets stuck in the undercut, which can even make it impossible to get the two parts apart anymore!

Solution: .......................................With the 2" parfocalizing ring you can prevent the barrel from entering the 2" clamp too far. That way the problem can be avoided.

Another application: With the 2" parfocalizing ring you can permanently change the focal plane of an accessory. Example: If you have two eyepieces with a different focal plane you can attach the parfocalizing ring so that both eyepieces have the same focal plane.

These are but two of many applications for the parfocalizing ring. Practical use will surely demonstrate many other applications.

Price:

Item No.	Short description	Price - Euros incl. VAT
2z Konter	2" parfocalizing ring with two slug screws	19.-

Specifications:

Length 5mm

2" inside diameter

outside diameter about 60mm

Please send requests or online orders to: sales@telescope-service.com

2" on 1.25" reducer with compression ring

2" on 1.25" Adaptor with many additional functions .... BA 2408190

Two screws lock the eyepiece tightly through a compression ring. This centers the eyepiece (or other accessory) and holds even the heaviest accessories securely in place.

The adaptor has several additional threads for extra functions:

- a T2 female thread that allows you to attach the adaptor to telescopes or parts with T2 thread.

- an M34 female thread that allows you to attach Baader glass path correctors.

- a T2 male thread for use of the adaptor as eyepiece projection adaptor. Can be combined for example with the T2 extension tubes.

- of course the adaptor also has the 2" filter thread

BA 2408190

2" on 1.25" adaptor with compression ring and several additional threads (T2 inside, M34 inside, M48 inside, T2 outside)

9mm

2" barrel

1.25" female with compression ring

38.-

Please send requests or online orders to: sales@telescope-service.com

2" Chrome Sleeve with SC male thread .... BA 2408155

This adaptor allows you to use SC accessories (focal reducer, off axis guider, ...) with normal 2" focusers.

The barrel has a safety undercut to prevent it from dropping out of the focuser.

The adaptor itself requires no optical length.

B2408155

2" Chrome Sleeve with SC male thread. The adaptor has an additional M48 filter thread on the telescope side.

2" barrel

SC male thread

25.-

Please send requests or online orders to: sales@telescope-service.com

2" on T2 Focal Adaptor .... BA 2408150

An excellent quality focal adaptor for photography and many other applications. The adaptor has a 2" barrel with safety undercut and a T2 male thread on the other side.

In addition the adaptor has two further threads on the telescope side:
- T2 female for use of several special adaptations
- M48 filter thread female for use of 2" filters

The effective length is only about 2mm.

BA 2408150

2" on T2 Focal Adaptor with additional M48 and T2 female threads

2mm

2" barrel

T2 male

25.50

Please send requests or online orders to: sales@telescope-service.com

2" visual back for Schmidt-Cassegrain telescopes

2" Visual Back with additional 2" filter thread

A really clever idea: With this adaptor you can use normal 2" accessories (with 2" barrel instead of SC thread) with your Schmidt-Cassegrain and at the same time use 2" filters!

Advantages:
-- You can permanently install a "soft" minus city light filter (e.g. Skyglow, or just a normal IR cut filter) which will not only perform its duty as a filter, but also keep dust out of the telescope!
-- You can switch eyepieces without having to change the filter from one eyepiece to the other all the time.

The adaptation is simple ( see the left animation )
-- remove the 1.25" visual back or the star diagonal
-- screw part number 17b to the SC thread of the telescope
-- screw the desired filter into the 17b adaptor
-- screw part number 17a onto part 17b.
____________________________________________________________________

Recommended Filters:

Baader 2" IR & UV cut filter - permits the entire visual spectrum. You can leave the filter permanently installed to protect the telescope from dust and your eyes from UV and IR light. ............... Further Information

Astronomik 2" UHC Filter - an excellent nebular filter for telescopes with 150mm aperture or larger .............................................................. Further Information

17a	BA 2958141	2" Visual Back for Schmidt-Cassegrains - with compression ring. You need either part 17b or 17c for the adaptation	53mm	M58 female	2" female with compression ring	42.-

17b	BA 2958142	SC female adaptor for no. 17a, with M48 filter thread inside	0mm	SC female	M48 female, M58 male	13.-

17c	BA 2958143	SC female adaptor for no. 17a, without the additional filter thread. This adaptor also doubles as an SC conversion ring with SC female thread on both sides	0-6mm	SC female	SC female, M58 male	10.-

Please send requests or online orders to: sales@telescope-service.com

SC Focal Adaptor - U