55mm from corrector to ccd, with my ossp v2 aka qhy8l i just got sorted the other week being in the same boat lol. My ccd sensor was 10.7mm inwards used a 5mm t2 spacer between the nose ans camera then the nose goes into the corrector/reducer i'am using making it 55.7mm. From what i understand most correctors ect use a 55mm distance and the badder one has a tolerance of +/-1mm. My T2 thread is at the base of the camera which is great as theres no vignetting as this then goes to the nose piece to a 48mm thread, my sensor is a APS-C size. Anyhow thats how i'am running mine though still haven't had time to crack off some real shots.
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