Actually, the problem I had, was a 2000mm lens on a very shaky tripod, even
using mirror lockup, the shutter curtains moving was still too much
vibration. These were the best, some of the others were much worse. I hope
someday to acquire a good mount in my travels, so until I do, I am limited
to cripple-ware. I guess I will have to sell a few more ocicats, or one
exotic would be enough.
Catmaster
> I haven't seen anyone else mention this, so I guess I will.
>
> One of my photography books notes that if you shoot astronomical objects,
> you need to keep the shutter speed at 1/2 second or faster. Anything
> slower, and the effects of the earth's rotation begin to show--detail on
> the moon blurs, and stars begin to elongate from points into elipses.
>
> Now of course, if you have an equatorial mount that follows the earth's
> rotation, you can long-expose to your heart's content. And the 1/2 second
> limit doesn't apply for things like star trails, aurorae, comets or the
> sun's corona during a total eclipse.
>
>
>
> --- Peter
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