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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?
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) M42 x 0.75 (T-2) Compatible Brands Astro T-2, Baader Planetarium, Pentax Type of Adapter Camera Adapter