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I purchased a GSO 6" f/4 Newtonian "Astrograph" late last year and eventually found that stars on one corner were egg shaped while taking images. I narrowed it down to improper centering of secondary mirror from the factory and resulting tilt.
Long story short, after numerous iterations, I used the Advanced Newtonian collimation technique by Astro Shed guy and ended up with the below pic of the optics. Does it look ok or do I need to do more? I will be checking with a Howie this weekend too.
Having recently replaced my astrophotography camera, I now have the old one up for sale on an astro site. However, doesn't hurt advertising it here
Here is an astro modified Canon Rebel xsi which is the Canon 450D equivalent. It is "good" condition and fully working order but does have some light scratches to the rear screen. I have tried to photograph these but they do not show up when the camera is switched on
Shutter count is 3860 which is extremely low.
Also included are the following :
Astronomik CLS clip filter which really is fantastic and makes a huge difference. It also adds additional dust protection.
Battery system / dc coupler - connects to a figure of 8 lead (IEC C7 Power Lead) - I might have one spare if deemed absolutely necessary. This device provides permanent power to the camera for those long nights - brilliant !
3 batteries and multi-voltage charger (mains / 12volt / 24volt)
I do not have the original box but it can be posted to UK address.
I would prefer collection (near Filey, North Yorkshire) but willing to post if you cover Paypal fees.
I might have a couple more batteries in other camera bags !!
Reason for sale is purchase of an astro modified Sony A7S with canon lens adaptor.
Including a few photos taken with this camera. Two of these images were placed 1st and 3rd in two separate Astrofest competitions in Yorkshire (York and Hull).
I recently got myself a GSO 6" f/4 astrograph, but seems like the secondary mirror was quite off. I then tried collimation using Astro Baby's tutorials, and others around the net. I've had a few Nets during the past 20 years, but this one seems to be a bit of a pain to get right. The secondary holder is a bit stiff. Anyone here done any mods for the scope and have reasonably good performance? I'be attached an image with Mire De Collimation circles. Image shows the reflection of primary, followed by the edge of secondary and followed by the grey card placed behind the secondary, which ends with the focuser tube. Any help will be appreciated.
Edit: If I were to move the secondary towards 2'o'clock position, could it solve the problem?