With all the discussion of 617 cameras today I finally discovered the
term "center filter". I had a hunch what it was but verified the hunch
that it was used to control vignetting when I discovered this.
<http://www.bhphotovideo.com/c/product/149254-REG/Linhof_022302_Center_Filter_95mm_for.html>
This raises a question in my mind whether the use of center filters is
common in large format photography with wide angle lenses. After all, a
6x17cm negative is basically a horizontal 2-1/4" wide slice out of a
5x7. Vignetting tat the corners of a 5x7 negative must be even worse.
Chuck Norcutt
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