Hi Shel,
Diffraction is the killer of images when stopped down. However, as the
focal length increases, the effects of diffraction is less. Diffraction has
about the same effect on quality lenses. For example, lens of 50 @ f8 is
diffraction limited as a 200 @ f32.
Bob
----- Original Message -----
From: "Shel Belinkoff" <[EMAIL PROTECTED]>
To: "Pentax List" <[EMAIL PROTECTED]>
Sent: Wednesday, April 10, 2002 5:20 PM
Subject: Using a Macro Lens
> In order to gain reasonable DOF using a A-100mm/2.8 and the A*-200mm/4.0
> macro lens, I imagine that I'd have to stop down quite a bit. However,
> I don't want to lose much, if any, sharpness. Any thoughts on the best
> aperture to use on these lenses? Do they defy the laws of physics and
> maintain good resolution and sharpness when stopped down to f/16?
> One object I want to photograph is about 1/2-inch deep, and is rounded
> in shape. I'd like to capture that as much as possible, as well as
> surface details, such as scratches and engraving. The item is a small,
> brass hash pipe, if that helps. What do you macro shooters do when you
> want good DOF and good surface detail? Here's the object I want to
> photograph. Suggestions gratefully accepted.
>
> http://home.earthlink.net/~belinkoff/temp/pipe.jpg
> --
> Shel Belinkoff
> mailto:[EMAIL PROTECTED]
> http://home.earthlink.net/~belinkoff/
> http://home.earthlink.net/~belinkoff/darkroom-rentals/index.html
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