focusing inconsistencies 77ltd

Started Sep 3, 2010 | Discussions thread
wlachan
Veteran MemberPosts: 6,759
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Re: focusing inconsistencies 77ltd
In reply to opiecat, Sep 4, 2010

opiecat wrote:

at infinity? why so?
i would have thought that closer distances are more critical.
can you please elaborate?

The farther the distance is, the lesser lens travel is required. Imagine turning the focus ring 1mm near infinity might throw the subject OOF, but turning the same amount at closeup distance might not mean much at all. Just study the focus ring scale & you will see what I mean. In fact, focus screen calibration is also done with virtual infinity target too in factories.
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