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Thread: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

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    Member vince's Avatar
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    Default Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    More of a spotting scope but optically quite okay (apart from mild CA). Tracking the Moon and Saturn was a pain in the butt though...

    The moon : 100% crop tripod mounted from an EOS10D


    Saturn : 100% crop tripod mounted from an EOS10D
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain


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    Senior Member Pablo's Avatar
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    Hi vince,

    Great Moon shot, when did you mtake it ?

    Will you be taking one of a full moon at anytime ? I would like to see it.

    Great that you could also shoot Saturn

    Cheers.
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    Member vince's Avatar
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    Quote Originally Posted by Pablo
    Hi vince,

    Great Moon shot, when did you mtake it ?

    Will you be taking one of a full moon at anytime ? I would like to see it.

    Great that you could also shoot Saturn

    Cheers.
    Took it sometime last month.

    As for shooting full moon, I won't be doing it cause it's not as impressive. The moon looks rather flat when it's full whereas you can actually see the shadows being cast by the craters near the terminator when it's not full.

    You might be interested in trying out an "earthshine" photo of the moon instead. Quite impressive as well but problematic when it comes to tracking the moon due to lower shutter speeds used.
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    Nice shots! how do you manage to get it? What lens did you use, and what shutter speed and aperature?
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  6. #6

    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    Very nice.

    Maybe you can tell us how you did it?

  7. #7
    Member vince's Avatar
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    H'okay...here goes...

    The Celestron C90 Mak-Cas is a 1000mm f/11 Telescope which is no longer in production.

    For the shot of the moon, I mounted the camera on the telescope via a Canon EOS adapter and T-Ring. This is called prime-focus photography. The exposure was half a second.

    For the pictures of Saturn, it's done using eyepiece projection and it was a 1 second exposure.
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    maybe you can try stacking 10 to 20 images of saturn for a better image...

    i like the moon shot, but it could use a little USM

    if you like, you can desaturate the moon to get rid of the CA at the fringes...

    thanks for sharing
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    Member vince's Avatar
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    Quote Originally Posted by djork
    maybe you can try stacking 10 to 20 images of saturn for a better image...

    i like the moon shot, but it could use a little USM

    if you like, you can desaturate the moon to get rid of the CA at the fringes...

    thanks for sharing
    Tried that for saturn and the Orion Nebula but it didn't seem to work out that well. Used a program called Astrostack. Actually, shooting the moon even at 1000mm you get slight motion blur at 0.5sec...
    Last edited by vince; 20th May 2006 at 11:00 AM.
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    Default Re: Moon & Saturn with Celestron C90 Maksutov-Cassegrain

    Quote Originally Posted by vince
    Tried that for saturn and the Orion Nebula but it didn't seem to work out that well. Used a program called Astrostack. Actually, shooting the moon even at 1000mm you get slight motion blur at 0.5sec...
    i use astrostack last time too, but i can manage 1/15 - 1/60 using D30/10D

    may be u should increase the ISO to keep the shutter speed at least 1/30, esp when u have problem with tracking
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