On Friday, February 01, 2002 at 12:48, frieder.faig@xxxxxxxxxxxx-
stuttgart.de <olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] Long Focus vs. Mirror Lens" saying:
> On Thu, Jan 31, 2002 at 01:34:36PM -0700, Daniel J. Mitchell wrote:
...
> > Also, how awkward _is_ this? f8's a reasonable aperture, I guess, but
> > do you end up needing a lot of ND filters or something in practise?
>
> What is the speed of the film? Remember the sunny F-16 rule. This is the
> usual brightness of sunlit scenes. There are not too much cases, when you`ve
> to
> deal with a lot more light. (double amount = a lot more, but just one stop!)
>
> 100 ASA -> ~ F16+1/125s -> F8+1/500s
> 400 ASA -> ~ F16+1/500s -> F8+1/2000s
>
> I´ve no experience with mirror lenses. But I´d guess one ND-2 filter would
> help
> in most cases.
Don't forget that mirror lenses lose about a stop to the middle mirror, so
you wouldn't need an Neutral Density filter in daylight unless your ASA was
over 400, even with 1/1000.
tOM
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tOM Trottier, ICQ:57647974 http://abacurial.com
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