Hi Andrew, I use an old Nikon FE so this might work for you as well. You will want to use a cable release of course. Balancing it well will reduce the amount the scope will react to the vibration. Finally, and hopefully this will not be specific to my camera, use the shutter release timer. Yup, a
little known secret is that if you set the timer, the mirror will flip when the button is pressed and the shutter will activate when the timer finishes. The mirror vibrations have a chance to dampen down during timer delay so you just have the shutter vibrations to worry about which I've found are
minimal when the scope is well balanced.

Hope this helps,

Glenn Graham
Analogy, Inc.

----------------------------------------------------
What I do instead of sleep:
http://www.rca-omsi.org/rca/members/graham/graham.html <http://www.rca-omsi.org/rca/members/graham/graham.html>


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Sent: Friday, June 04, 1999 4:56 AM
Subject: [M]: OT:Astrophotography.
Importance: High

Hi All,

Can anyone tell me the best way to eliminate shutter vibrations of the OTA
whilst doing astrophotography?
I have a 10" Lx200 and I'm using a Nikon FA 35mm camera, I have just bought
a set of counterbalance weights which I have not had a chance to try out
yet.
Any suggestions?

I plan to start using an autoguider soon with a guidescope and I want to
eliminate this problem before hand. I'm hoping that the counterbalance
weights may do the trick, I used to use a piece of cardboard with black
velvet on it to hold in front of the OTA,
trip the shutter, then after a few seconds remove the card from the front.
Culd it be that in the past I didn't have the weights and that it was off
balance?

Has anybody had similar problems/remedies?

Thanks in advance,

Andy.

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