Quote:
Originally Posted by Paul Haese
Sorry Barry just got back to this again. The DBK is by far the better of the two cameras.
A 2.5x powermate is good but a 2x and the addition of an extension as John suggested is a better idea.
Part of the problem you have is the diameter of the scope. It is quite small for a planetary scope and will let in a certain amount of light. Which in reality is it will be too small an aperture for very high magnification. I would suggest the 2x will be large enough and give you enough head room on your gain and exposure to all a 3/4 histogram. If you went higher in magnification the light intensity is less again and that means you would have the gain at full or near full and the exposure at a level that frame rates slow down just to get the histogram near the same position. This is not an idea situation for planetary imaging. At 4x I would think your light fall off would be so bad that you would struggle to get a 1/4 histogram and that would result in onion ringing and a very noisy image.
Everything is about the light intensity and how well you can fill the histogram. Hope that makes sense.
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Some does. Thanks Paul.
Down the track I hope to be upgrading to a 14 inch OTA therefore much better suited to planetary imaging. I still want to be able to do my widefields and DSO's so I will probably keep the ED120 and use it as a guide-scope.
Looks like the Powermates don't come in 2x except in 2". What would be the best, a Barlow or a Powermate? Which one?
Here's the
page I'm looking at on Bintel.
What do you mean by the addition of an extension?
Baz.