Hi everyone,
I am using a Bausch and Lomb convertible lens on my 5x7 (Protar VIIa). It looks kind of like this: http://www.ebay.com/itm/Bausch-Lomb-...item3cc45f6040 .
My question is, how do I use it properly? It's mounted to a lens board and the shutter is exposed when I remove the front element. I tried to focus when I unscrewed the front element, but my bellows seem not to be long enough. How can I use it for 3 different focal lengths? And what are the strange things on it that seem not to move (the "roll" on the top behind that dial (mine is a dial that shows numbers up to 150, with the arrow pointing at 150)? And the lever on the right (on the photo) - it doesn't move either.
Can anyone offer any advice?
Thanks!
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