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Old Jun 24, 2010, 5:43 AM   #1
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Default Can I have a Telescope?

I have my first DSLR comming to me in the mail. Its a Pentax K-x. anyway do cameras have telescope attachments? is there anything I can use to see stuff like the moon or other planets?
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Old Jun 24, 2010, 6:15 AM   #2
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Until an expert comes along with a more definitive answer, try looking up digiscopes. I think they do exactly what you want.

[Edit - try reading here: http://forums.steves-digicams.com/di...microscopy-64/]
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Old Jun 24, 2010, 8:51 AM   #3
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With a DSLR, you have a lot of options. Many telescopes are able to use T-mounts where the eyepiece of the scope goes. With this, and the proper T-mount adaper for your camera, you can use your telescope as a camera lens. There are also lenses made in long focal lengths which will give you views of the moon which will nearly fill the frame.

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Old Jun 24, 2010, 9:28 AM   #4
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Quote:
Originally Posted by Trihame View Post
I have my first DSLR comming to me in the mail. Its a Pentax K-x. anyway do cameras have telescope attachments? is there anything I can use to see stuff like the moon or other planets?
You can have a telescope. If you have one already, maybe you can
get a mount for your Pentax. If you don't have a telescope, maybe you
could get a suitable lens instead. Either way, good quality optics with
a long focal length are expensive.
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Old Jun 24, 2010, 5:41 PM   #5
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can get some really good telescopes for a 1000 but they have a fixed aperture cheap ones usually f8 or smaller - good ones think you can get them down to about f4 - then as mentioned a t-mount adapter and your good to go

http://www.warehouseexpress.com/buy-...ostar/p1009415

an f4 1200mm lens if you could find such a think it would cost 10k or more easily and frankly this thing could well be 2000mm - sadly deson't actually say - but unlike a lens you can change the aperture and you will get donut bokeh but for taking photos of stars and planets thats really not a problem

a lens that would give you this amount of magnification is gonna cost way way WAY more if you can even find one

been thinking about this myself but dont think i do enough astrophotography to warrent the cost over my 150-500mm sigma lens
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Old Jun 25, 2010, 5:45 PM   #6
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The one problem you will have with your Pentax Kx is DFS or Dark Frame Subtraction. What this is, that during a long exposure - greater than 10 seconds or so, the camera will take the exposure, and then take a second exposure of the same duration, then subtract the two. What this does is reduce the noise and hot pixels. Other camera makes give the user the option for performing a DFS after each image, or just when you want. The bottom line is if you take a 30 minute exposure, the camera will take another 30 minute DFS, thus your time between exposures will be 60 minutes in this case.

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Old Jun 25, 2010, 6:19 PM   #7
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yeah is annoying that - keep hoping that will get a firmware update to give us the option of when to do it

but for things like the moon at least its not a problem since its bright and can be taken on very short exposures
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