Baader T-Ring Pentax K to T-2

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# 2408302

€ 22.00 Price excl. German VAT tax (19%): € 18.49

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Baader T-Ring to connect Pentax-K DSLR cameras on the Astro T-2 system
Represents the standard exact distance of 55.0mm from the front support surface of the T-ring to the image plane of the camera body forth
On the camera side: Pentax K bayonet
Telescope side: T-2 internal thread with 0.75mm pitch

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Product Questions

The flange focal distance for Pentax DSLR is 45,46 mm, but the specs of the ring is a height of 9,5 mm. If it is actually 9,54 mm in order to get the required distance of 55,00 mm, could you please be more specific in the product description, so that buyers don't worry about this point ?

Question by: Cassegrain on Mar 19, 2021 12:56:00 PM | 1 Answer(s)

I want to install a Ha filter (have not bought yet) as close as possible to the camera body of my Pentax K-1, similar to what the Baader Canon T-ring can do with the filter chamber built into the T-ring. Can this T-ring for the Pentax be able to have a filter installed like in the Canon T-ring with a filter chamber? If not, how can I get a filter as close as possible to the t-ring or camera body?

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Question by: John on Oct 15, 2017 4:37:00 AM | 1 Answer(s)

I want a connecting ring between my Pentax K200D and the Multi Purpose Coma Corrector # 2458400. The coma corrector fits to a Newtonian telescoop from GSO (Guang Sheng Optical, Taiwan), the F4 model (reflector 200mm, focus 800mm). The only thing is that the register distance between the corrector and the filmplane must be correct for Pentax K. Registerdistance is the distance from last lenselement from a Pentax lens to the filmplane which is 45,46 millimeter.

Your website about your Baader T-ring tells, quote: “Represents the standard exact distance of 55.0mm from the front support surface of the T-ring to the image plane of the camera body forth”

Now, this 55,0mm is longer than the 45,46mm registerdistance from Pentax.
Does the ring still work and let focus?

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Question by: P. Coene on Dec 29, 2016 3:49:00 PM | 1 Answer(s)

The Pentax K indeed has got a flange focal distance of ~45mm - but this in fact is the distance from the (bayonet) lens flange at the front end of the camera body itself to the sensor inside the camera.

If you use a PENTAX T-2- T-ring-adapter (for instance our item # 2408302), you gain the exact additional distance to produce the required distance of 55mm with your PENTAX camera body.

55 mm is a well established industry standard for DSLR-T-2 rings (dating back to the days of SLR-emulsion films). Accordingly the T-2-rings matching different DSLR-cameras have got different heights. This is to provide a standard lens distance for any DSLR camera body, so that also third party lenses (Tamron, Soligor a.o.) can be used on any DSLR camera.

This is the reason why the MPCC had been designed for the 55 mm focus distance.

Today the standard has "softened" somehow with the advent of mirrorless 4/3 cameras and many other imaging tools that continue to replace DSLR-cameras these days. It is the reason why we have been designing a multitude of other variable length adapters like the "Vari-Lock-system". Also many modern telescopes do require larger light cone throughput than the T-2 standard can supply. For this reason the latest design of the MPCC even can unthread the T-2 male thread and be attached with the outer M48 thread supplied at the camera-end of the MPCC. However, finding the right parts for producing the correct sensor-distance is somewhat trickier than using the well established T-2 standard.

Answer by: Baader Web Team (Admin) on Jan 9, 2017 8:51:00 AM

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Specifications

Additional Information

Manufacturer	Baader Planetarium
SKU (#)	2408302
EAN Code	4047825012586
Net weight (kg)	0.03
Optical length (mm)	9,5
Usage	to connect (D)SLR cameras to the Astro T-2 thread system
Camera Adaptable	Pentax K
Inner Diameter / Clear Aperture (mm)	41
Outer Diameter	59
Inner Connection (lens sided)	Thread, T-2 (M42 x 0,75)
Outer Connection (eyepiece/-camera-sided)	Bayonet
Compatible Brands	Astro T-2, Baader Planetarium, Pentax
Type of Adapter	Camera Adapter

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