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DSLR photography

  • 02-07-2007 2:58pm
    #1
    Tea drinker
    Registered Users, Registered Users 2 Posts: 2,817 ✭✭✭


    Hi folks,
    do any of you have experience using an slr for bright and not so bright objects?
    I have a Nikon D80, wife has Sony alpha. My scope (orion optics 8" spx type tube) has a 2" focuser. I am wondering:
    1. should I use a 2" T adaptor?
    2. Can I, or should I use a focal reducer for extended objects??

    what are either of these slr's like for astro photography?


Comments

  • #2
    Dr Pepper
    Registered Users, Registered Users 2 Posts: 841 ✭✭✭Dr Pepper


    I don't know BUT.. if you go to www.irishastronomy.org (you've probably already seen it!), and click 'bulliten boards', there is a forum specifically for Astrophotography where you will probably find the advice you're looking for. Not to say you won't find it here ;)


  • #3
    Grayarea
    Registered Users, Registered Users 2 Posts: 247 ✭✭Grayarea


    Tea drinker wrote:
    Hi folks,
    do any of you have experience using an slr for bright and not so bright objects?
    I have a Nikon D80, wife has Sony alpha. My scope (orion optics 8" spx type tube) has a 2" focuser. I am wondering:
    1. should I use a 2" T adaptor?
    2. Can I, or should I use a focal reducer for extended objects??

    what are either of these slr's like for astro photography?

    Hi Tea Drinker,

    You will find the limiting factor will probably be how big the periodic error of the mount is.

    A 2" T adapter is probably the best it will give the least vignetting. But just to warn you you may have very noticable coma unless the scope is setup for astrophotography (normal secondary mirrors are too small for astrophotography where you require a fully illuminated field) and you would need a coma corrector normally.

    Focal reducers usually introduce unacceptable vignetting. For extended objects you can use your camera piggybacked on your mount (with a zoom lens). This is also probably the easiest area in astrophotography to start as mount error (periodic error) will have the leasst effect.

    As well as IFAS you may want to look at Uk Astro Imaging (http://ukastroimaging.co.uk).

    Later,


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