Increase maximum focus distance?

Started Sep 21, 2012 | Discussions thread
omniuspi
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Re: Increase maximum focus distance?
In reply to Chris R-UK, Sep 21, 2012

I am not using a "modern lens".

I am looking at a very old Rodenstock TV-Heligon which is as I described - it has no optical focus and so focus is a fixed distance. The minimum focus distance can nonetheless be reduced with extension tubes, indeed variably so with a focusing helicoid which makes it work like a regular manual focus lens - with the unfortunate caveat that the focusable range becomes less than the maximum, not more.

The question remains: can the maximum focus distance of a lens with fixed focus be increased?

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