[Peter Ward]

Originally Posted by Martin Pugh

..... So, you are not trying to get as close as you can to your optimum backfocus distance for the RC, but adjusting the distance between the camera and the FFC by adding/subtracting those spacer/washers that RCOS sells?

Martin

Thanks Martin...

Re the rings: Sort of.

I do infact try to keep the backfocus at optimum, but the FFC changes the FL.

I have not been able to get exact numbers from RCOS, so the optimum FFC to sensor distance determination, has been a trial and error process using the FIA rings.

I suspect I am close, but perfection would require a custom spacer which I don't have at present.