The Dutch Observatory

November 3, 2009 on 3:55 pm | In Jupiter, Planets | Comments Off

The nice weater continued and conditions to observe Jupiter were great!  I made 5 images of which this one is the first.  I also did some more testing with the sample ratio for my imaging.  Most images I make are made with the Williams Optics 2x barlow used in binos, which result in an f-ratio or f/15.  Using the Celestron 2x shorty plus with my extension tubes allows me to go up to f/30, but at a far increased exposure time and the result is not as nice.  This image shows the GRS just sliding off the side and Ganymede getting ready to disappear behind the planetary disk.