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Old 09-06-2010, 07:32 AM
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pmrid (Peter)
Ageing badly.

pmrid is offline
Join Date: May 2008
Location: Bribie Is.
Posts: 3,132
Originally Posted by telemarker View Post
I noticed that you are using the Hotech FF with the ED127. Could you give us an appraisal of its performance at the edges of the QHY8. Is it a flat field?
It's not bad. My separation is not quite 55mm (it's 54.2) but it's near enough I think. The edge coma I saw without the FF seems to have been corrected. Here are 3 images from Monday night. See what you think. all 3 are ED127/QHY8 and between 2 and 3 hours of 10min subs. The 4th image of NGC6559 was taken a few weeks before and without the FF.
Attached Thumbnails
Click for full-size image (ophnebNGQH60x3cropweb.jpg)
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Click for full-size image (W_VeilNGQH16x10web.jpg)
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Click for full-size image (B72NGQH11x10web.jpg)
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Click for full-size image (ngc6559ED127web.jpg)
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Last edited by pmrid; 09-06-2010 at 08:27 AM.
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