1¼" Filter holder T-2a to T-2a – with 1¼" filter thread

Product Details

SKU
1508030
EAN Code
4047825016287
Manufacturer
Baader Planetarium

Ports & Compatibility

Adaptable to
SBIG CCD-Cameras, CFW-8 color filter wheel
Compatible Brands
Astro T-2
Baader Planetarium
Celestron
Inner Connection (eyepiece/-camera-sided)
M28.5
Inner Connection (lens sided)
M28.5
Outer Connection (eyepiece/-camera-sided)
M42 x 0.75 (T-2)
Outer Connection (lens sided)
M42 x 0.75 (T-2)
T-2 Part #
31

Optical & Usage Specifications

Adapters Family
T-2 System
Optical length (mm)
0
Type of Adapter
Filter holder
Same-Thread Adapter

Dimensions & Weight

Inner Diameter / Clear Aperture (mm)
28
Net weight (kg)
0.01
Outer Diameter
46

Customer Reviews

Tell us what you think about this item!Looks like no one reviewed this product yet.

Jean / March 12, 20231 Answer

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The description of this filter holder says it has a continuous male T2 thread on the outside, but the image looks like it has some kind of stop ring (maybe midways). According to the specifications, the outer diameter is 46mm, much more than the 42mm of a T2 thread, which suggests that there is really some kind of stop there. Which one is right: is there a continuous male T2 thread from one end to the other, or is there a 46mm stop separating two male T2 threads?

Lionel Fourquaux / February 28, 20232 Answers

This adapter has a continuous M42x0.75 male thread on the outside and includes a removable 1mm M42 spacer-ring which acts as a stopring.
Baader Web Team / December 30, 2024
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Thanks for bringing this to our attention. The description was indeed wrong, we have corrected it now. There is indeed a 46mm stop ring between the two T-2 threads, but its not fully centered. Check out our T-2 inverter ring for a continuos thread: https://www.baader-planetarium.com/en/baader-t-2t-2-inverter-ring.html
Baader Web Team / March 1, 2023
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Dmitriy Smolensky / October 13, 20211 Answer

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Denis / June 27, 20203 Answers

Two reflective surfaces aligned parallel to each other can cause internal reflections. Unfortunately, we don't see any other solution.
Baader Web Team / April 7, 2025
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Why does the filter give reflections when placed close to diagonal or the binoviewer? Is there another solution?
… / April 7, 2025
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This should work, although you probably need a T-2-extension (7,5 or 15mm) so that the filter doesn't hit the prism. A mirror diagonal is less critical. But there is a higher risk of reflections because the filter is very close to the prism diagonal and the prisms inside of the bino-viewer. We'd recommend to place the filter in the nosepiece in front of the star diagonal.
Baader Web Team / June 29, 2020
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Service & Company

Service & Company

1¼" Filter holder T-2a to T-2a – with 1¼" filter thread