Quote:
Originally Posted by Crushellon
Yeh, but the thread on the reducer is 6.5mm long. So no matter how small a spacer you put o the closest you can get is 7.5mm.
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Tim if your running the 3" Photoline reducer, the working distance to your camera sensor for your scope should be 61mm. The standard Canon setback is 55mm. You should have 6mm to play with. Also in my experience with that reducer on my TS115 and TS80, it has some latitude in spacing. Don't forget that if you have any sort of filter on the front of your DSLR it will length the focal length slightly, as per the "Rule of 3rds". On my ASO1600MM-C that means adding an extra 1mm to the back spacing due to the filter and AR cover window on the camera.
BTW, the TS Canon bayonet is thinner than some others, like the Bintel ones. I bought a TS bayonet and it was 8.62mm thick, the Bintel one i measured at 10mm. Re the combined M48 spacer to the sttep down to T2 at the bayonet, just make sure that tube has enough depth at the front end to take the Photoline threads. I am running my Nikon D5300 on my TS80 and 3" Photoline reducer without spacing issues, and on my f7 version the backspacing is just 58mm. Key to this is the depth of M48 thread in my adaptor, which takes all that 6.5mm male thread to the reducer shoulder.