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Old 15-08-2010, 09:48 PM
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midnight (Darrin)
Always on the road

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Join Date: Aug 2010
Location: Australind, WA
Posts: 891
Help! Focusing a DSLR through 8" SN

Greetings again.

I am getting a little mystified with nailing the focus for the moon.

Basically I am trying to understand the limits of my camera and scope before I target some more difficult objects.

My problem is that when I use the Livefocus and zoom in to 10X (its a Canon 40D) I can fine tune the focus so that the liveview is really sharp despite the resolution of the 40D's LCD.

Then when I take the photo - it just never seems to be as sharp as the liveview - has anyone noticed this?

My setup is :
Canon 40D prime focus via a t-ring into a Meade LXD55 8"SN. The OTA has been laser collimated.
Mirror lockup turned on - I wait at least 6 sec before the 2nd trigger.
Remote release cable so I don't touch the camera.
Mount is steady and tracking well.

3 Photos here : All ISO 100. 1/400th ; 1/350th ; 1/750th taken over the last few months here in the backyard.

Any help would be great. Perhaps it's the limit of the camera maybe?

Cheers,
Darrin...
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