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Also about 35 years ago we started to do accessories with that 3.3" size - and we saw that if we do create our own norm for the thread width - which is a tiny bit wider on the Celestron OTAs, then we could do one ring that will fit both telescope brands.
So we do produce 3.3" threaded rings with our own "in-house-standard" - and it works on both brands.
Manufacturer Baader Planetarium SKU (#) 2458216 EAN Code 4047825036254 Net weight (kg) 0.09 Optical length (mm) 11,5 Inner Diameter / Clear Aperture (mm) 58 Outer Diameter 81,5 Outer Connection (eyepiece/-camera-sided) M68 x 1 Inner Connection (lens sided) 3.3"/SCT Thread (84.2 mm) Compatible Brands Baader Planetarium, Celestron, Meade, Zeiss Type of Adapter Reducing Adapter Adapters Family M68 System
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