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Bad optics or bad eyesight?

  • Keenan
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17 years 11 months ago #30765 by Keenan
Replied by Keenan on topic Re: Bad optics or bad eyesight?
I have already had a look at Jupiter. I could see 3 moons and fancied I could see 4. Also had a look at Saturn a few weeks ago.

I have been out a couple of nights in winter - I have a solution for the cold nights - a patio heater. It keeps the frost off the scope and the observer!

I use the binoculars most of the time. It's so much handier than dragging out and setting up the scope, plus a lot easier to use.

Thanks for all the tips.

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17 years 11 months ago #30768 by ftodonoghue
Replied by ftodonoghue on topic Re: Bad optics or bad eyesight?
Just one other tip Keenan

If you are using a patio heater near the scope it will probably lead to an unsteady local atmosphere and cause shimmering of any images in the scope.

Cheers
Trevor

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17 years 11 months ago #30776 by Keenan
Replied by Keenan on topic Re: Bad optics or bad eyesight?
Thanks everyone for all the tips so far, maybe I'm getting hooked!

I've been looking at those photos again and I'm puzzled. I can see stars, looking like I would expect 9pinpricks of light), but then there's a big reddish-brown blob with a green halo which is the object in question.

This image is a typical example, one of a dozen where the same object appears, albeit looking different in each one - allowing for camera-shake and newbieness, is this capella?

The proportions look all wrong to me - any ideas?

Several other photos at www.propertyfile.net/astro [/url]

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17 years 11 months ago #30780 by dmcdona
Replied by dmcdona on topic Re: Bad optics or bad eyesight?
Keenan, I suspect that what you think are stars are in fact 'hot' pixels - electronic noise within your camera and nothing to be ashamed of :D

The only 'true' image recorded seems to be a bright star, albeit smeared over a small portion of the frame.

In order to diagnose it better, can you tell me what camera you're using and what was the exposure time?

Cheers

Dave

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17 years 11 months ago #30781 by michaeloconnell
Replied by michaeloconnell on topic Re: Bad optics or bad eyesight?
I think what Dave is saaying may be correct. My guess is that the camera has difficulty focusing as there's nothing to focus on , hence the blur. Also, as the sky is relatively dark, the exposure becomes long and the cmaera shakes in your hands while the shutter remains open.
Just my hunch...

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17 years 11 months ago #30783 by dmcdona
Replied by dmcdona on topic Re: Bad optics or bad eyesight?

IMy guess is that the camera has difficulty focusing as there's nothing to focus on


I didn't think of that :D Keenan - can you set your camera to manual focus on infinity? That'd help - autofocus would probably get very confused...

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