On Friday, September 07, 2001 at 14:41, Roger Wesson <olympus@xxxxxxxxxxxxxxx>
wrote on "Re: [OM] Sports shots," saying..
> I've got a 500mm mirror lens, and it's a reasonable performer. What's
> let me down with it so far is the fact that it's so light I've often
> thought I could get away without a tripod, which at that focal length
> you really can't.
>
> Main disadvantage is the fixed aperture, f/8. Even in bright
> conditions it's a pretty dim image, so in any kind of low light
> situation it may be rather tricky to use.
Tho nominally f/8, with the central obstruction, it's more like f/10
Tom
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