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Old 06-01-2008, 10:14 PM
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kljucd1 (Daniel)
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Prime Focus Astrophotography

Hi,

If you want to use an 8" newt for astrophotography, without a barlow, is that where you need to shorten the length of the tube?

So far I have managed to use a barlow and or eyepiece projection to image the Moon without lopping off the end of my telescope, but have not been able to bring it to focus without using this method. I would like to be able to image the whole Moon, rather than the sections I have managed so far.

Let me know

Thanks

Daniel...
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Old 07-01-2008, 04:59 AM
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iceman (Mike)
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Hi Daniel.

What camera are you using?

If it's a DSLR, or even a DMK, then it's likely you'll need to move the mirror up the tube or get a very low profile focuser.
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Old 07-01-2008, 08:26 AM
bonox
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isn't the moon a little large for an 8" newt if you want the whole disk in one frame? You wouldn't prefer to piggyback the camera on the tube/mount?
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Old 07-01-2008, 12:24 PM
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kljucd1 (Daniel)
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Hi,

Yeah Iceman I have a Pentax *ist DS.

I can get something like the following with a barlow, so I am not sure what that would mean for getting the entire moon in the FOV.

http://farm3.static.flickr.com/2257/...37e0a1b6_o.jpg

Oh well, it looks like it might be choppin time , poor thing.

Daniel...
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Old 07-01-2008, 12:27 PM
bonox
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you might get lucky. The dslr is a big sensor (well, compared to those using webcams anyway) and raising the mirror will reduce the focal length a bit. Your image above shows that you won't get the whole disk with a barlow though and if you need to move the mirror to get focus without it, you aren't exactly spoilt for choice. Good luck and have fun.
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Old 07-01-2008, 01:50 PM
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ving (David)
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prime focus? thanks for the reminder!
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