B4 mount, flange focal distance measurement.
Posted 21 September 2010 - 05:58 AM
If I have a B4 mount lense but no camera mount or adaptor, where on the lense flange do I measure the flange focal distance from?
Posted 22 September 2010 - 02:55 AM
Posted 22 September 2010 - 05:56 AM
Just to be really clear. The flange on the lense has three wings or tangs that stick out, then it's steped down to a smaller diameter behind this. I thought that flange focal distance would probably be measured from the rear of the flange with wings on it, but wanted to make sure that it wasn't from the rear of the steped down flange.
Like I said in my other post, I was curious to clamp this lense (Canon J15x9.5B ) on a bench in front of my Eclair ACL. I don't know if it will properly cover the frame and I don't know how sharp it can be.
Edited by Gregg MacPherson, 22 September 2010 - 05:58 AM.