Hi Tyler, Thanks for the confirmation. Interesting to learn that your dad is an astroimager too. Like father like son. Thanks too for your version of my Horsehead shot. I've posted it to my album: http://www.slas.us/gallery2/main.php?g2_itemId=1025 Note that that was all 3x3 data. I've got 2x2 data I took the same night. I'll try and post that kit tonight now that everyone seems to be finished with my 3x3 kit. patrick On 26 Feb 2009, at 09:40, Tyler Allred wrote:
Patrick, You are dead on about the focal length and the star size. My dad uses a C-14 for his imaging, and we have had many discussions on this topic. In my opinion, the star size is usually dictated by the atmospheric conditions more than the optics. With the jet stream passing over our heads (as it usually does), our skies are pretty shaky. Those little wobbles don't amount to much when shooting at 520mm with my Tak Epsilon or at 720mm with the ASA N8, but are pretty obvious when shooting at the focal lengths you use (I'm guessing your C-14 at F/11 is roughly 3073mm). In almost every case, if you shrink the size of your image down to the same scale as mine, the star sizes will look about the same. Cheers, Tyler