Jersey guy Loc: New Joisey

Here's a surprise...for me, anyway. 18 years ago I bought a top of the line Canon film camera along with a Sigma 75-300mm zoom telephoto. After I acquired my new digital I checked out some forums as well as contacting Sigma about the possibility of compatibility of lens to new camera. All discouraged me, including Sigma who offered me a generous trade-in toward a new lens of similar specs. They said it could not be "re-chipped". What concerned me was the report from some that using such an old lens on a new digital had screwed up the on-board software of the camera.

Well, I wanted to see what kind of perspective the lens would give me (on my APS-C sensor it would appear as a 480mm) so I mounted it but didn't turn on the power. In a moment of unguarded enthusiasm, I powered up and, lo-and-behold, the doggone thing works great...auto focus and all.

Was I just lucky as heck, or is this not unusual? By the way, I can't find the record of what I paid for this lens so I don't recall if it's a "good" lens, or run-of-the mill at the time. It's a Sigma 75-300mm DL (the only ID I can find on the lens body).

Is there any risk in going forward with this?

imagemeister Loc: mid east Florida

Older Sigma lenses are noted for the diaphram not working properly on Canon digital - they only shoot at wide open aperture - have you tried that ??