View Single Post
Old 25-04-2006, 08:31 AM
CometGuy's Avatar
Registered User

CometGuy is offline
Join Date: Feb 2005
Location: Brisbane
Posts: 942

I remember how my old Pentax 300 f4 would reach stars of mag 14 with colour film with exposures of 15 minutes, yours (300 f5?) reaches mag 16 in 9 minutes according to my measurements!

However, I still think you underrate Canon sensors. For example attached is an ISO400 image I made in April 2004 with a standard 300D. Its of M83 at 530mm Focal length at T3.5 (about 1 stop faster than your lens). It was made under good conditions from my backyard in the bayside suburbs of Brisbane. Its noisy, but its just a single 90 second exposure....

Attached Thumbnails
Click for full-size image (m83_90sec.jpg)
32.7 KB107 views
Reply With Quote