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John,
There is a chart on the JML website:
http://www.jmloptical.com/level2/index.aspx?pagename=ProductInfo/lenssystems_info.aspx
that you may find interesting. However, so many similar focal length
lenses are listed, it may be difficult to tell which lens you have. Also,
if your lenses are older, they may have been discontinued and not on this chart.
I know there is one JML of about 8" FL that is supposed to have very wide
coverage and is sought after by 8X10 users. From my reading of the chart , it
appears the 209.5mm f11 versions have the greatest coverage. I imagine the
figures given by JML are for the most critical graphic arts uses and for normal
photo use the usable coverages may be larger. You will probably have to test the
lenses you have to see what they acually can do.
As far as opening the lenses up
wider than f8, I've never thought of it, but it might work, at least for
focusing. You would have limited depth of field at f4 (although if you are doing
selective focus, that may be what you want), and some lenses do shift the plane
of focus as they stop down, but that would be easy to check. If you are able to
modify your lenses to open up wider, please let us know how it works.
Leonard
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- [Cameramakers] JML lenses John Cremati
- Leonard Robertson
