A little calculation using f/calc:
1 - Full frame 5 subject equals to a rough 1:5 ratio.
2 - Using your 50mm lens you'll get 1:5 at 30 cm., i.e. you need an
extension tube.
3 - At f/1.4 and 30 cm. (1 ft) your 50mm will yiekd less than 3mm depth
of field
(with a .033 COC).
Hope this helps,
Allright, I guess I'll be shopping for extension tubes. Thanks to all for your help.
Steven.
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This message is from the Pentax-Discuss Mail List. To
I need advice on how to severly limit DOF for macro work. I realize that most (all?)
macro equipment tends to reduce DOF. I want to limit the sharp area to a few
millimeters on a (35mm) frame filling shot of a 5 inch subject. What is the best set
up for this? Tubes, reversing ring, close-up
A frame filling shot of a 5 subject is hardly macro work. Tubes, bellows,
etc wouldn't be neccesary. Either of your zooms should cover it. Just shoot
wide open to limit DOF.
Christian
On Thursday 23 May 2002 14:54, steven gilson wrote:
I need advice on how to severly limit DOF for macro
equipment is needed for this purpose, an extension tube +
a prime or any macro zoom should be OK.
Hope it helps,
Mishka
From: steven gilson
Subject: OT: limiting DOF for macro???
Date: Thu, 23 May 2002 11:44:12 -0700
I need advice on how to severly limit DOF for macro work. I
Christian wrote:
A frame filling shot of a 5 subject is hardly macro work.
Tubes, bellows, etc wouldn't be neccesary. Either of your
zooms should cover it. Just shoot wide open to limit DOF.
You'd do well to pick up some extension tubes, anyway. You
may find a
My point was that for the subject mentioned in the original post (5 inches
filling a 35mm frame) the lenses he had would do it. There is no need to buy
anything extra for what he wants to do now.
Sure later on he may want to get more junk but maybe he'll never need it
again.
Christian
On
Ok, let me try this again. I do realize that I don't need specialized macro equipment
to get the framing I want. But what I have does not limit the depth of field to the
level I'm looking for. I have tried this shot with both the 35-105 and the 50 wide
open. So maybe I don't need macro
- Original Message -
From: steven gilson [EMAIL PROTECTED]
What lens set-up, macro or not, will give me the narrowest DOF when
photographing a 5 inch subject filling a 35mm frame?
Thanks again,
The fastest lens you own!
Bob
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This message is from the Pentax-Discuss Mail List. To
Steve: Depth of field is dependant on two things1) how close you are to your
subject or in other words the magnification factor, and 2) the maximum
opening of your lens. The two combined, as in most macro work, means extemely
limited depth of field. You can probably use what you have. Shoot
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