I have a redrock M2 that I bought second hand that I need to upgrade. I'm going to upgrade to the HD achromatic and cinescreen II to minimise light loss. Hopefully this will reduce vignetting but if nothing else will give me more light. Now being second hand I don't know what the previous owner has done. It is easy enough to figure out that my existing achromatic is 55mm and hasn't been upgraded but how can I be sure the cinescreen is the old version? I read somewhere that the cinescreen II with improved light loss is slightly larger than the original cinescreen. Does anyone know the actual measurements?
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