On-Axis Guider or Self-Guided Camera?
Posted 15 January 2013 - 10:56 PM
Using off-axis is pretty tough where I am, lots of light pollution makes it hard to find a guide star (and just generally frustrating in any case), and really the only complaint I have with the QHY8 is that it's a pain to keep it dry and frost-free on the CCD, so my personal lean is towards getting a sealed QHY8L instead and the on-axis guider. Wouldn't add a lot of cost.
A self-guiding camera would have less optical surfaces than a setup with a cold mirror, which might give a little more efficiency. I really can't say I know a lot about the self-guiding cameras yet.
One extra potential option would be adding an AO unit in the future. It might be cheaper to add an SBIG one than one that works with other systems like the Starlight Express unit, though I think the overall cost is still more with SBIG.
Posted 16 January 2013 - 08:20 AM
I use the On Axis guider from Innovations Foresight. It gives me a lot more guide stars to work with. I live in the light polluted city. I use it with my Meade 12 inch SCT. I use a DSLR to image with and hope to try out the QHY8 with it the next clear night. I did use a SBIG ST2000 camera but sold it since it took 4 times as long to image since it was mono.
Posted 16 January 2013 - 10:28 AM
What I do is make sure the air inside the camera is really dry. I leave the camera with sensor open to the air inside a sealed plastic bag (one of those vacuum laundry bags) with a jar of silica gel inside.
After a day inside the bag, I close up the camera without opening the bag. Seems to be working so far...
Posted 16 January 2013 - 10:30 PM
Posted 16 January 2013 - 10:34 PM
Posted 17 January 2013 - 08:22 AM