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Mostafa

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Posts posted by Mostafa

  1. 1 hour ago, scitmon said:

    If you mean in terms of field of view, then this site can help you with that: http://astronomy.tools/calculators/field_of_view/

    Select imaging mode tab, use "custom scope" then adjust the focal length field accordingly.  The canon 2000d isn't an option either, but if you select the 1000d which will have the same chip size that will give you an accurate representation.  Here is what M31 would look like at 300mm:

    1612035449_astronomy_tools_fov(1).png.882d3931b9ed3a002eae65f15c4c36c2.png

     

    That is how it would be framed, but in terms of detail etc, that depends on your exposure length and how many images you stack together.

     

    Thank you.

  2. On 16/07/2020 at 16:44, almcl said:

    Here's an image of the Heart nebula shot with an ST80 and a Canon 700d about 5 years ago.  Processed in DSS and StarTools.

    18 x 180 sec lights, 30 flats and 30 bias frames.

    I acquired the ST 80 as a guide scope and wanted to see how it performed as an imager.   I haven't used it for imaging since.

    Heart.jpg.da146aa4a056f4138d67b64487c48f47.jpg

    Why are the edges warped? And the stars an unnatural colour? Is this from the telescopes or processing?

     

  3. 5 hours ago, malc-c said:

    Can you advise us what make and model the mount is as some will be better than others.  It's really difficult to advise when we have no idea on how capable the mount and motor drive is

    But if the motor on the RA axis is designed to work with the mount you have then it should provide good enough tracking for wide angle shots with your camera and lens.  Provided you can polar align the mount well there would be little to no tracking errors in a wide field image.  It's only when you start using long focal length lenses or telescopes that the alignment becomes critical, and limits the exposure duration before guiding is needed in order to prevent star tailing.

     

    It is a Saxon eq1 mount with tripod and Saxon eq1 ra motor drive, made for each other.

  4. 5 hours ago, almcl said:

    Here's an image of the Heart nebula shot with an ST80 and a Canon 700d about 5 years ago.  Processed in DSS and StarTools.

    18 x 180 sec lights, 30 flats and 30 bias frames.

    I acquired the ST 80 as a guide scope and wanted to see how it performed as an imager.   I haven't used it for imaging since.

    Heart.jpg.da146aa4a056f4138d67b64487c48f47.jpg

    Thanks.

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