wmurnahan wrote:
If it is a FD mount Sigma it was made in a time when a Canon zoom had exceptable image quality, it was a time when, if you wanted a good image you bought a prime lens. Now when you moved from a major maker, like Canon or Nikon, to one of the aftermarket, off brand name zooms, they were crap. Just saying, if is is a pre auto focus, it was not computer designed and zooms were few and far between and considered poor quality.
Sidestepping the question of quality of film-era zooms, my problem with manual focus zooms is the difficulty of using them effectively. It's one thing to adjust the lens to a specific focal length within the zoom range, than focus and shoot. It's still another exercise completely to dynamically adjust the focal length to a subject, especially a moving subject, and manually focus the lens. At least on a digital body, you're not wasting film along with your time.