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Imaging Issue

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#1 hungerford

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Posted 28 December 2012 - 02:25 PM

Hi,
I am trying to image with a GSO 10" newtonian f4 but the stars are not round and the is shadow on the botton left hand of the stars. When I image a bright star I get the normal reflection cross plus some flaring a 11 and 5 0'clock.
The camera is use is a QHY9c fitted with a Baader MPCC corrector placed at 55mm from the chip.
The scope was collimated with a cheshire eyepiece and finished with a laser. The laser has been correctly collimated.
I do not know what is creating this extra spike and I do not know what to look for.
Any help with this would be really appreciated.
Here is a single frame of 5 minutes exposure.
http://www.flickr.co.../in/photostream
Many thanks for your help.
Vince

#2 JoseBorrero

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Posted 28 December 2012 - 07:09 PM

can't tell about the comma, usually the MPCC do an excellent job, but you should collimate with camera installed as flexure can take part when installing the camera and can explain the extra spike.






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