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RE: [OM] eyesight vs. focusing

Subject: RE: [OM] eyesight vs. focusing
From: "John A. Lind" <jlind@xxxxxxxxxxx>
Date: Thu, 09 Aug 2001 23:58:28 +0000
At 17:24 8/9/01, Daniel J. Mitchell wrote:
> Now, what I don't understand is why, when I'm doing macro photos, I have a
_devil_ of a time focussing on the screen. If I'm photographing something a
long way away, I can look "through" the screen, and if I get my eyes to
focus at infinity, everything is sharp -- the speed display is okay, the
image is crisp, all is well.

 If I'm photoing a flower from a foot away, I have a lot more trouble
getting my eyes to "click" into focus on the screen. Why is this? Surely if
the screen is "2m away" it shouldn't make any difference what I'm projecting
onto that screen?

 -- dan

Dan,
You may be suffering from an extremely shallow depth of field focusing with the lens wide open, particularly if it's a long, fast lens very close focused. The DOF with an 85mm - 135mm at f/2 or f/2.8 with a subject about one to two feet from the lens can be a fraction of an inch. Unless the subject is dead flat, it can be impossible to make all of it in focus. Try stopping down and using the DOF preview button. Sometimes I'll turn the split image across an edge at the distance I want to focus, focus the lens with it, and then compose the frame.

-- John


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