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Thread: Can my telescope handle deep space observing?

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    Default Can my telescope handle deep space observing?



    I was interested in taking pictures of deep space on my Mead ETX 90 is this possible and if so can you give me ideas on easy to view objects?
    Thanks!
    Clear skies,
    toddpe
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    Telescopes:Mead ETX 90ec Eye pices:9.7mm Super Plössl, 26mm Super Plössl, and Barlow lens. Camera:Canon EOS 30D

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    Default Re: Can my telescope handle deep space observing?

    While it is possible to connect a camera, you will find it exceptionally difficult to take DSO images with that scope. It is on an alt-az mount, which limits your exposure times to about 30 seconds max, due to field rotation. And its focal ratio is about f/14, which is exceptionally slow. You just won't get enough photons per pixel, especially with 30-second exposures, to create decent images.

    To give you an idea how slow f/14 is, an image that I can capture with an hour of exposure time with my f/4 imaging scope will take nearly 12 hours with the ETX90. While I can get my hour with 12 5-minute frames, you would need to take over 1400 30-second frames to get similar results!

    It can be done, if you are patient, but I don't think it is worth the effort. You are better off saving for an imaging scope.

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    Default Re: Can my telescope handle deep space observing?

    Try SharpCap and a ZWO224 with an inexpensive .5 reducer. SharpCap will correct for image rotation, and with exposures as short as 5 seconds, stacking will give you "reasonable images". Needs a laptop but it is about your only option. I use this technology with my 8" SCT and 4" apo. But more importantly for you, I use it with a SLT mount and a C90 (old USA model) or a ST80. SharpCap and camera will be under $300 US.

    Should mention with the proper adapter and a second hand FR3.3 (meade) you should get pretty good stuff also with the above software and camera. Used FR3.3 go for between 60 and 100 US on CloudyNights.

    Even if I didn't have the better setup, an SLT and my C90/ST80 combo would have made me happy with EAA.
    kingclinton and kanadalainen like this.
    C90 (USA Rubberized, 1996), C8 (2000), ES 102 Triplet (2018), Orion ST 80 w/2" GSO focuser (2018), Starmaster 20 x 80 (2015), Eagle Optic Rangers 10 x 50 (2004), Sirius AZ-EQ G PRO (2018), LXD75 (2" legs, 2007), SLT (2008), Manfrotto 055 CF (2007) , ZWO224, Panasonic Gx8 (8 second live view, 4 shot stacking in camera)
    I tend to keep my Astro stuff Forever
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    Lots of software and other "Stuff".....

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