So I have this lens and would like to know 3 things:
1) Where the nodal (iris) point is so I can correctly measure the focal length and figure the speed, from all the drawings on the net it looks like in the center is where they put it.
2) Is there any reason to cut a waterhouse stop slot in a projection lens, or am I just making problems for myself & the lens??
3) How do you check to see if the elements are in the right configuration ? What happens if you rearrange the glass?
Thanks~
Steve
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