Well, interesting point. Obviously, depth of field will change between images. So,
I'll keep this in mind when bracketing if I am intending to digitally extend my film
latitude. You learn something new every day--on this list!
Kevin
-----Original Message-----
From: Shel Belinkoff [SMTP:[EMAIL PROTECTED]]
Sent: Friday, January 05, 2001 8:28 PM
To: Pentax List
Subject: Bracketing Changes Image Size
Lewis Kemper, in an article in the current issue of Camera
Arts magazine, states that when bracketing for critical use,
such as registering different layers with different exposures
in photo editing software, one should bracket by changing the
shutter speed because if you varied the aperture the image
sizes would vary slightly.
Now this is the first time I've heard that changes in the
aperture setting can change the size of an image. I suppose
it's not important if you're only going to use one of the
bracketed images, but I can see where it can be a problem in
any sort of critical work, not only in photo editing software.
So, how much change in image size can one expect bracketing
in �-stop increments? How much might the image size change
when going from wide open - say f/2.0 to f/8.0? Is the
distance from the subject a factor, and, if so, how much of a
factor? Is the change in image size effected by the focal
length of the lens, and is it greater in longer or wider
lenses? Has anyone here experienced this?
--
Shel Belinkoff
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