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General Astronomy >> Beginners Forum

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Reged: 01/22/14

Am I out of focus? Collimated badly? new
      #6328703 - 01/22/14 03:41 PM

Ive just started using my 8 inch SCT. Wondering if what I am seeing here is correct... These are various shots of Sirius and Betelgeuse at various levels of iso and exposure. Was taking these from prime while testing out things. I am wondering if the way I am picking up these stars is correct for an SCT. Ive been told (at ) that the stars in an SCT wont have the X flares on them, but what I am wondering is if I need to adjust the telescope any more.

I know these photos are out of whack for iso and exposure, was testing to see how much noise it would make at various settings.

Best examples of what im seeing and

There was a fair amount of vibration from the dogs running around in some of those shots, I assume that accounts for the wobbles in some of the stars?

Telescope is an EdgeHD800 on an Advanced VX. I've already got vibration pads on the way.

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Carpal Tunnel

Reged: 03/20/13

Loc: Florida
Re: Am I out of focus? Collimated badly? [Re: mspk7305]
      #6328713 - 01/22/14 03:47 PM

It looks like it may be slightly off. Have you done a star test on it yet? Sirius makes a great candidate due to its brightness. You can check this by focusing a bright star, and slowly backing in (or out) of focus until you see a concentric ring pattern. This image shows perfect collimation, you should aim for something like this.

It's best to do this test through your longest focal length eyepiece -- I use a 4.7mm to check mine.

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Reged: 01/22/14

Re: Am I out of focus? Collimated badly? new [Re: StrangeDejavu]
      #6328875 - 01/22/14 04:56 PM

thanks, ill check my eyepiece against the image

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