Micro adjustment, distance to the chart

Started Apr 16, 2012 | Discussions thread
Michael W00d
Contributing MemberPosts: 798
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Re: Micro adjustment, distance to the chart
In reply to Owen, Apr 16, 2012

By chance I was just reading an hour ago what a much respected photo journal (Amateur Photographer) advocates as the required distance: ‘not less than 50 x lens FL’. So for the 100mm end of your lens that means at least 5 metres.

Having said that, it doesn’t look as if it is the sort of distance being used in the photograph that appears in the focus test chart PDF produced by Tim Jackson ( http://FocusTestChart.com ). The instructions don’t give a precise distance but the way the system is set up – target horizontal and camera on a tripod pointing down at 45 deg – it would be almost impossible to manage more than a relatively close separation.

What it states is: 'When shooting your test pics, you need to be close enough that the test chart somewhat more than fills the frame. Get nice and close.'

So these two views are widely separated.

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