Re: Porr images with 20D/C90

In article <1127567780.618535.183230@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
"jess" <jgates@xxxxxxxxx> wrote:
>I have a relatively new DSLR and an old (~ 1980, black tube) Celestron
>C90. The other light I tried taking a picture of the full moon with
>the camera at prime focus (tripod, ASA 400, 1/300, remote release
>after ~10 sec of MLU), and the results were well-exposed but very
>fuzzy. I thought that perhaps the 'scope was damaged or had
>deteriorated in some way, but visual observations (30mm Kellner) look
>very sharp. So, I have a few questions:
>
> 1. Is it normal for lunar astrophotographs to have much lower
>resolution than visual images?
> 2. Since the 'scope focus "beyond infinity", it is very
>difficult to focus on the screen in a Canon 20D. Do you have any tips
>for manual focusing with a DSLR, or is it largely trial and error?
> 3. The tripod I was using was an old, cheap Velbon (~$25 new) I
>bought for a video project, and is none too stable. If you touch the
>'scope at all the image dances all over the place. After some
>research, I've ordered a Bogen / Manfrotto 3246 with 488RC2 Midi
>Ballhead that will be used primary for daylight photography, but it
>hasn't arrived yet. Would you folks with experience expect this to
>be any better?
>
>I understand that the 'scope is not the greatest, and this was my
>first try at lunar imaging, but my images look nowhere near as good as
>those I've seen from similar setups. I don't expect miracles, but
>these pictures are pretty sad. Any suggestions?

Jess,

I tried a similar setup to take a picture of a Lunar eclipse, and got
rather poor results as well:

<http://www.whim.org/nebula/astro/eclipse20041027.html>

The problem there was mirror flop. Since you have the 20D, you can
set the mirror lockup in the Custom Function menu (CF12 I believe).
Use that and wait for the mirror vibration to settle before the
shutter is released.

Rob Johnson <rob@xxxxxxxxxxxxxx>
take out the trash before replying
.

Relevant Pages

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