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first ccd image
12/19/1999
13.1" DOB. 1X6SEC. CWIP12A -- John N. Gretchen III N5JNG NCS304 http://www.tisd.net/~jng3 |
#2
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first ccd image
John N. Gretchen III wrote: 12/19/1999 13.1" DOB. 1X6SEC. CWIP12A ------------------------------------------------------------------------ You have it on a drive platform I assume. They now make them that have dual axis correction same as a standard equatorial mount. Not sure how well they work. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#3
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first ccd image
Well, here's mine: Comet Hykutake on April 2 in 1996 with my first CCD, an
OES LCCCD14SC, which hat 16 micron square pixels (in a whopping 386x290 pixel array), 30% peak QE and horrible dark current in spite of peltier cooling. Don't know which lens I used, but I can see in the header that it was a ten second exposure. Stefan |
#4
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first ccd image
"Rick Johnson" wrote .... You have it on a drive platform I assume. They now make them that have dual axis correction same as a standard equatorial mount. Not sure how well they work. ........ Rick, et al: Although I have no experience with imaging with an alt/az Dob I have seen some pretty good work from those using them - or at least StellarCat equipped Dob's. If you limit your imaging to the part of the sky with little field rotation you can get 30 to 60 second exposures and just align them. The StellarCat system will control the only field de-rotator that I know of (actually it will control any stepper motor activated de-rotator), and it will also take direct tracking input from SBIG cameras just like a GEM will. I've seen good images with a Meade camera and Obsession 15 without using a de-rotator, and I've seen great images from an Obsession 25 with a new UTA that has a field de-rotator, focuser, and camera suspended in place of the secondary mirror. In this case the owner was using an SBIG AO-7 in addition to the guider input into the StellarCat. In his first image, when he did not know what he was doing, he went about 30 minutes on an exposure (on a 25-inch!!!) and of course it was way overexposed - but it was accurately tracked with nice round stars. He says that the biggest problem he has is collimation since he can't look thru the scope and the Obsession was never designed to hold all of that weight on the nose end. George N |
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