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#1
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Thickness of front-cell shim for 210mm APO-Sironar-W?
Does anyone know if this shim is a standard thickness, and if so, how thick
it is? Or did each lens get its own shim to optimize its performance? Mine came with no shim, but most APO-Sironars I've seen or heard of had a shim between the front cell and the shutter. This is the 210mm APO-Sironar-W (the big one, in Copal 3), not the APO-N or APO-S. Thanks. steve |
#2
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Thickness of front-cell shim for 210mm APO-Sironar-W?
"Steve Goldstein" wrote
[Does] each lens get its own shim to optimize its performance? Yes. Most lenses will have a shim but some won't. The lenses with shims will have varying sized shims, with a majority having a shim thickness in the middle of the shimming range. -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation http://www.nolindan.com/da/index.htm n o lindan at ix dot netcom dot com |
#3
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Thickness of front-cell shim for 210mm APO-Sironar-W?
"Nicholas O. Lindan" wrote
"Steve Goldstein" wrote [Does] each lens get its own shim to optimize its performance? Yes. Most lenses will have a shim but some won't. The lenses with shims will have varying sized shims, with a majority having a shim thickness in the middle of the shimming range. I should clarify this: if the manufacturing tolerances of the lens mount and shutter are good enough for the lens design then no shim is needed. -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation http://www.nolindan.com/da/index.htm n o lindan at ix dot netcom dot com |
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