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Thread: G1 on a telescope

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    Workshop Member Woody Campbell's Avatar
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    G1 on a telescope

    Things are a bit slow here for a gear head, so I though that I would try to liven things up by mounting my G1 on a telescope. I ordered a 2" to four-thirds telescope adapter, and connected it to the camera with a four-thirds to micro four thirds adapter.

    The G1 has several advantages in this application - primarily the 10x live view focus - focus is the most difficult issue to solve with a telescope (in astro applications there is software available that solves the problem by analyzing star images, but that doesn't work in terrestrial applications). It's also light, and relatively vibration free.

    I mounted the camera on an Astro-Physics Traveler, which has an aperture of 105 mm and a focal length of 610 mm for a focal ratio of f6.0.

    Here's a sample:


    Attachment 16102

    100%-rez crop:

    Attachment 16103


    In LR I increased contrast and fussed with the color balance, and applied the same minimal sharpening that I use with Leica files.

    This seems promising - I've got a few small bits on order that will let me put the telescope on a robust Alt Az mount - the above are on a ball head which doesn't work that well with a telescope. I'll post more as I get it put together. With the Alt Az mount it should be fairly easy to shoot stitches, permitting larger file sizes and prints.

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    Re: G1 on a telescope

    Quote Originally Posted by Woody Campbell View Post
    Things are a bit slow here for a gear head, so I though that I would try to liven things up by mounting my G1 on a telescope. I ordered a 2" to four-thirds telescope adapter, and connected it to the camera with a four-thirds to micro four thirds adapter.

    The G1 has several advantages in this application - primarily the 10x live view focus - focus is the most difficult issue to solve with a telescope (in astro applications there is software available that solves the problem by analyzing star images, but that doesn't work in terrestrial applications). It's also light, and relatively vibration free.

    I mounted the camera on an Astro-Physics Traveler, which has an aperture of 105 mm and a focal length of 610 mm for a focal ratio of f6.0.

    Here's a sample:


    Attachment 16102

    100%-rez crop:

    Attachment 16103


    In LR I increased contrast and fussed with the color balance, and applied the same minimal sharpening that I use with Leica files.

    This seems promising - I've got a few small bits on order that will let me put the telescope on a robust Alt Az mount - the above are on a ball head which doesn't work that well with a telescope. I'll post more as I get it put together. With the Alt Az mount it should be fairly easy to shoot stitches, permitting larger file sizes and prints.
    Woody, Seems like an excellent way to get large, high res files for making big landscape prints with fine detail. Looking forward to seeing your results with this setup.

    Regards,
    Carl

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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    I've had some time to explore this topic a bit further.

    Here's my red G-1 with a 2" telescope adapter. Second image is the G1 mounted on an Astro-Physics 130 mm f6 refractor. The solar, landscape and macro images below are with an Astro-Physics 1.8x barlow, which makes the effective focal length 1400 mm, the equivalent of a 2800 mm telephoto on a 35 mm camera.

    Attachment 17043


    Attachment 17044
    Last edited by Woody Campbell; 30th May 2009 at 14:43.

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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    So here is the full setup. Note the rhododendron in the background.

    The close up is the top of the rhododendron through the telescope. The field of view is a little less than a half degree.

    Attachment 17045

    Attachment 17046
    Last edited by Woody Campbell; 30th May 2009 at 14:25.

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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    A crop of the rhododendron

    Attachment 17047

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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    Pointing at the landscape. Again the field of view is a little less than a half degree.


    Attachment 17048

    Attachment 17049

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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    Finally, the telescope set up for "'white light" solar observation with the camera mounted on a hershel wedge; and a view of the sun. The sun is very quiet now - we're in a low point in the sunspot cycle - but a plage and convection cells are clearly visible.

    Attachment 17050

    Attachment 17051
    Last edited by Woody Campbell; 30th May 2009 at 14:48.

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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    The point?

    The G1 works superbly on a telescope because of its light weight and ease of focus. I've tried this with a Canon 1DsII and a 5D with much, much poorer results because it's very hard to achieve accurate focus on a ground glass.

    The images of the telescope were taken with an M8 without an IR blocking filter - the dark bits on the telescope, the barlow and the adapter are actually black, not dark magenta.

    I'll try some easy astro objects tonight, and some H-alpha solar images tomorrow.
    Last edited by Woody Campbell; 30th May 2009 at 14:51.

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    Re: G1 on a telescope

    Woody

    Great topic and wonderful images. Reminds me of when I tried the same thing w/a 1Ds II; I agree too heavy it difficult to get a goo capture while having the feeling of an anchor at one end of the lens.

    Never shot the sun. Very impressive.

    Don
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    Re: G1 on a telescope

    Woody, Nice set-up and fantastic resolution. Have you tried any stitched landscapes yet?

    Carl

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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    Three stitches:

    1 x 4

    Attachment 17092

    1 x 3

    Attachment 17091

    1 x4

    Attachment 17090

  12. #12
    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope


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    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    Finally, the sun this morning through a Coronado H-alpha filter. The filter and exposure are tuned to show prominences. I've blocked out the solar disc so prominences are more visible.

    Attachment 17096

  14. #14
    Workshop Member Woody Campbell's Avatar
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    Re: G1 on a telescope

    I promised astro images but seeing here was so-so last night and the alt-az mount I'm using really isn't robust enough for astro imaging.

    So . . . that's all from me on this topic.

    I hope others try this and post. All you need is a small telescope and a G1.

    Google "telescope camera adapter" and you'll find what you need to connect the camera to the telescope.

    Next I go to work on trying to develop a more compact setup that I can take on the road.

    I misspelled "herschel wedge" in one of the posts above.
    Last edited by Woody Campbell; 31st May 2009 at 09:14.

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