Quote Originally Posted by stradibarrius View Post
how do I calculate exposure when I attach an extension tube or a teleconverter?
My TTL bodies will give me the exposure through the lens, but my RB67 does not have a TTL meter and I use a hand held meter.

Is it a factor that is added based on the length of the extension tube???
The same for a teleconverter???
Assuming you don't have the manual, go the butkus site for the RB67 Pro S manual where there's a chart that explains all.