The moon at lunation 8
The image from last evening, June 22, 2007 at 9:40 pm MDT at lunation 8.02 days. Lots of great stuff near the terminator on day 8, crater Cassini and Archimedes in the north, Ptolemeus and Alphonsus in the south, and the Vallis Alpes — there are many, many great features to see.
Image taken with Celestron Nexstar11 telescope with F6.3 focal reducer, and Canon Xti camera (1/640 sec exposure, ISO 400). Stacked 40 with Registax4 and then cropped and brightness adjusted with Photoshop Elements2. Louisville, CO temperature around 70° F, no wind, no clouds, transparency very good, but only 5/10 turbulence.
July 4th, 2007 at 8:36 am
I have a question about Registax and your prime focus shots … whenever I try to stack multiple shots from my Canon Digital Rebel XT I get memory errors. How are you handling the images?
July 4th, 2007 at 12:37 pm
I’ve found that its necessary to crop the images to somewhere around 3000×2592 in order to stack. If the lunar disk is larger than that, I crop each image twice, stack them separately, and then composite the two pieces.
Another technique that works most of the time (not always) is to convert them bmp or jpg format which is smaller than the tif images.
Also, make sure you have lots of space on your “C:” drive and defragment frequently. I defrag almost everytime I start to process a new set.
July 5th, 2007 at 3:32 am
Thanks, I will try that next time.