Parsec 8300M Sudden Blooming
Posted 05 December 2012 - 08:41 AM
I recently acquired a Parsec 8300M CCD camera. I've done a number of images with it, including a session of 15 minute images of M42 with no issues. Last night, I went out to do some 45 second exposures. The session started out just fine.. Then, out of the blue, the stars started to saturate and bloom vertically down the image. 'Weird' I thought. So I decreased the exposure time to 1 second. The blooming still occurred. For the heck of it, I unplugged and plugged back in the camera. The blooming went away.
I started my session, which included 45 second images and 3 minute images. It did fine for a while, then bloomed all over the place!
What the heck!? Why would my camera all the sudden do this? It is like the pixels are not discharging between images or something. I have 30 second pause between images too..
I'm running about f6.0 and it happened on all LRGB filters.
Thank you, Ryan
Posted 05 December 2012 - 09:30 AM
Posted 05 December 2012 - 09:31 AM
Posted 05 December 2012 - 10:07 AM
Sorry for the bad news ... I hope I'm wrong about your problem and it's something else ... Good Luck.
Posted 05 December 2012 - 12:13 PM
Posted 05 December 2012 - 06:00 PM
Posted 05 December 2012 - 07:25 PM
Posted 05 December 2012 - 09:09 PM
Posted 05 December 2012 - 09:32 PM
Posted 05 December 2012 - 10:04 PM
Posted 06 December 2012 - 01:55 AM
What does bother me however is that no NEW stars tracked in. I'd have expected some new stars but if this happened right at the end of the exposure that could explain it as there's nothing very bright to move in until it has moved quite a distance. So the move has to be right near the end of the exposure. Or it moved out then back and over precisely the same path. I find that difficult to swallow.
Try a field with plenty of bright stars beyond the FOV and see what happens when the streaks reoccur. Also rotate the camera so it is not aligned with RA and Dec. If it is the mount moving in RA then the streaks will be diagonal. If they still go straight down then there is a very odd camera issue it would appear.
Posted 06 December 2012 - 04:04 AM
Posted 06 December 2012 - 08:58 AM
Posted 06 December 2012 - 09:27 AM
There is also a small wiggle in the vertical lines which would be consistent with mount moving while blooming would be straight columns.
I am also curious to see experiment with rotating the camera and see if the lines rotate.
Posted 06 December 2012 - 10:19 AM
Posted 06 December 2012 - 10:49 AM
So, here will be my troubleshooting procedure:
1) recreate the problem with the same settings as before
2) Turn off autoguiding and see what happens. If the issue goes away, troubleshoot software and cabling (try PHD/look through wiring)
3) If issue persists, rotate the camera and see if the streaks rotate with it. If so, there is something weird wrong with the camera.
I will keep you informed. Thank you again!
Posted 06 December 2012 - 05:16 PM
Posted 07 December 2012 - 01:03 AM
Posted 09 December 2012 - 01:31 PM
Posted 10 December 2012 - 08:47 AM
Posted 10 December 2012 - 12:53 PM
Posted 10 December 2012 - 01:10 PM
Posted 12 December 2012 - 03:18 PM