I am looking for the effective focal length of the Nikkor SW 90 f/8. I do not own the lens up to now but am considering it for a special DIY project (focusing helicoid).
Although the above shortcut lists many dimensions and data, the effective focal length is missing (or am I missing something?):
http://homepages.tig.com.au/~cbird/nikkor/sw.html#SW90
Does anybody know what I am looking for or is it stated on each lens?
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