I am looking to purchase a telephoto lens for use with my Canon T70 SLR. My choices are 300mm at f4, 400mm at f5.6 and 500mm at f8 (mirror). I currently am using a 200mm with good results, no blurring or under/overexposure, however I want to get even closer tighter shots. The T70 does not have the ability to manually set shutter speed (stinks) and the camera selects the propper speed based on light available and automatically sets the f stop. Which lens would you choose to achieve my desired effect.
Your advise is respected