I had images from both ofthe same region so I thought I would try and compare them.
Canon 300mm F2.8L, field of view 6.86x4.58 degrees.
Orion 100ED with Astro Physics FR/FF has a focal length of 675mm and an aperture of f/6.7. Its FOV is 3.0x2.0 degrees.
300mm image 3.8MB
http://avandonkbl.bigblog.com.au/dat...0409133359.jpg
!00ED image 1.6MB
http://members.optusnet.com.au/~trlee8/100ED_7.jpg
An animated GIF of the same sky area from each 300k
http://avandonkbl.bigblog.com.au/dat...0411103821.gif
Bert