J. Williams <williams@xxxxxxxxxxxxxxxx> wrote:
>Which screens are best for Astrophotography and macro-photography (in the
>1:2 to 1:1 range)?
The Beattie interscreen, grid or plain, work well for me. The 2-13 Oly is
also praised by many.
<another snip....>
>Freezing or refrigerating film. Which is recommended? Does it matter if
>it's pro film or non-pro film?
Freezing is prefered. It arrests any further shift in the film. Pro film
tends to yield much more consistent results roll to roll. It is also less
forgiving to slight changes in your methods and procedures.
>
<another snip.....>
>
>I have extension tubes that will allow my 50mm f1.8 to go to 1:1. How
>sharp can I expect this set-up to be in the 1:2 to 1:1 range?
With the standard f/1.8, you will see sharp centers and soft corners or
sharp corners with soft centers with flat subjects. To get a flat field
center to edge, you need a macro lens.
>
>I was considering the 90mm f2 macro for close-ups (mostly flowers). Is
>this suitable for making copy slides? How about on a copy stand? Or
>should I use the 50mm f1.8 with tubes?
The 80mm macro bellows lens in the prefered lens for 1:1 slide copy work.
Oly has a slide copy attachment for this setup that works very well.
>
<yet one more snip....>
>What is the least expensive, best (sharpest) method for making slide
>copies?
See above for 80mm macro bellows with slide copy attachment. Works well
with TTL flash to boot <g>.
John P
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