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Thread: Newby with a questin on Astral Photography

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    Default Newby with a questin on Astral Photography



    Hi All

    First time post..i was bought a Skywatcher Startravel 102 with AZ3 mount with some extras, only used it a couple of times chose the moon as target as in london noise pollution is bad and time and energy have to coincide.

    I was also given a t-ring adapter for fathers day so had to play. set it all up was gobsmacked looking at the camera screen through the telescope and took a couple of test shots during the day, just boring stuff but served as a test.

    The only trouble i had was that although the 90deg thingy was as tight as i could get it the weight of the camera (cannon eos 350d) kept twisting the 90deg downwards. is there a trick to make it grip tighter.

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    Default Re: Newby with a questin on Astral Photography

    Welcome to the forums
    Do not use the diagonal if using the telescope for imaging.
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    Default Re: Newby with a questin on Astral Photography

    Welcome to the forum!

    Yeah, we do not use the diagonal when imaging.

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    Default Re: Newby with a questin on Astral Photography

    You may also need to get an extender tube if you remove the diagonal and cannot get it to focus properly when using just the camera in straight-through mode.

    The diagonal takes up some of the space between the telescope lenses and the camera and once it's gone, the camera might end up too close to the lenses for it to work.

    An extender will push the camera back out to where the focus point is. Then the focuser mechanism only needs to go back or forth a little bit to get it to perfect focus.

    I don't know the exact type of extender you might need though. The length and fittings depend on the scope and camera you are using.

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    Default Re: Newby with a questin on Astral Photography

    Hi and welcome to the forums!

    Take out the diagonal.
    If you look at the end of the 2" to 1.25"
    Adapter you see some threads, your T ring adapter will screw onto that.
    It's easier to take the 2" adapter out of the scope and then screw on the T-ring and attach it to the camera, then slot the whole lot back onto the scope.
    On my 102 you need to extend the draw tube fairly far out to achieve focus.
    I presume this is the F5 102?

    You can take a look at my blog to see some of the images I have taken with mine.

    http://kingclintons.blogspot.co.za/
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    Default Re: Newby with a questin on Astral Photography

    Thanks for all the help guys, the only problem i can see is that i am a larger chap in rotundness not height and trying to use the scope without the 45 or 90 diagonal is quite hard , but i will invest in a little (but strong) stool and try it, thanks.

    On a side night i was happy with the results quality wise as i say these were only astral not astro shots , shot some people and a bulldozer working just under 3 miles away that the naked eye or normal 50mm lens on camera just thought was horizon, cant upload photos as yet. anyway would there be any improvement in quality etc by not usimg the diagonals.

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    Default Re: Newby with a questin on Astral Photography

    I have taken some photos and uploaded them to dropbox.

    The first is the 2"-1.25" adapter and diagonal. I have removed them from the scope for the photos.

    https://www.dropbox.com/s/g6hw5pm5vo...60734.jpg?dl=0

    Now take out the diagonal and you will see the threads, they did not come out to clearly in the photo.

    https://www.dropbox.com/s/fza2zgjdya...60808.jpg?dl=0

    Now attach the T-ring adapter, the inside threads on your T_ring will fit.

    https://www.dropbox.com/s/jb7djhf36m...60837.jpg?dl=0

    Now attach your camera and put the whole lot back onto the scope.

    https://www.dropbox.com/s/o5uz8ngl4x...60922.jpg?dl=0
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    Default Re: Newby with a questin on Astral Photography

    if i understand right i take off my diag etc and using a 2" to 1.25" adapter, the smaller end fitting the tscope then add t ring to larger end then the camera.

    what benefit do you gain by having 2"?

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    Default Re: Newby with a questin on Astral Photography

    2" openings are intended for large eyepieces with wide fields and also for cameras with large sensors.

    In some cases, a 1.25" opening may be too restrictive and it might cause clipping or shadowing around the edges. For planetary imaging, this usually won't matter since planets are small and you can usually crop out the edges later. But for the moon or deep sky imaging, it will restrict the size of the usable field.

    If you can find a 2" extender that directly adapts a 2" opening to your t-ring, that would probably be best.

 

 

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