Quote:
Originally Posted by strongmanmike
The original pause after dither move in Astroart was only about 3sec and this was not long enough at all, so Fabio re-wrote that piece of the camera control software for me and increased the pause to 6 sec. This was better but still not long enough for 50% of dither moves, particularly if the move was in Dec, so he has since lengthened it to 15sec for me - this should do it  and I can set the max pixel movement to just 2 pix, which is enough for dithering to work.
Mike |
phd/Nebulosity uses the measured tracking error to decide when to start imaging again. If it is set too tight, it can take a long time and since I use the 694 with short subs, the imaging efficiency takes a hit.
An additional advantage of dithering is that it would allow super-res to be applied to any data you get in exceptional seeing conditions - that could be very useful.
Forgot to mention that 2x2 binning worked as advertised. Like most CCDs, the horizontal shift register in the 694 cannot accommodate the full signal from 4 pixels, but there were no signs of any unwanted overload artefacts seen that apparently can turn up (the 8300 for example is reported to produce slightly elongated bright stars). Seeing was pretty bad though when I used binning, so that may have masked any overload effects.
Quote:
Originally Posted by johnnyt123
that is a great image from the short exposure time....
I have been looking at buying a new CCD camera.
Do you have any experience with
Starlight Xpress SXVR-H814 Monochrome CCD?
I hope to have a fast system eventually.
John
|
Hi John. I don't have experience with the 814, but it has specs that are ~identical to the 694 in all but pixel size and number. On that basis it would be a great foundation for a small high res system with good sensitivity. It should be suitable for full res imaging with scopes up to about 1m fl in very good seeing conditions.
regards Ray