Long question for old timers

Started Jun 19, 2013 | Discussions thread
Dr Bob
Contributing MemberPosts: 827Gear list
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Re: Long question for old timers
In reply to fft81, Jun 21, 2013

fft81 wrote:

Thank you all for wonderful advice.

The reason why you get more in-focus pictured when using the closest extreme of the "in focus" range of the indicator is because in focus depth of field is 2x longer behind focus plane than in front of it, so by shifting focus plane closer you use more of the longer, rear, in focus range on the subject.

Only true at 1/3 of hyperFocal distance. At nearer distances for 400mm lens, say 100-200 ft, you will find circa 47% in front and 53% behind in focus For f5.6.

andy

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