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If you're using a Nikon camera, you want to lock the aperture ring at its smallest setting (largest f/number). You can control the aperture from the camera body, the same way as on a lens without an aperture ring.
This has nothing to do with the focal length. You can shoot at any focal length from 28mm to 200mm.
What kind of error? Err 99?
You mention DS 126151, that's the model number. This camera is mostly know as Canon EOS Rebel XTi? Also known as the EOS 400D or EOS Kiss Digital X.
If you are getting a Err 99 while shooting, try any other lens that will fit on your Canon. In most cases the aperture will become defect in these lenses. Not worth repairing if you ask me. One thing you could do, is shoot only at its maximum aperture. So that'll be F4.0 at 70mm and F5.6 at 300mm. That might work, but that might not be suitable in every situation.
The older Sigma lens will not work on the new EOS digital cameras...I've go two of them that will only work zoomed in at F4 and zoomed out at f5.6..... I shoot aperture priority with my Rebel XT and works out fine.... depth of field often shallow but, still nice shots.
There is a ton of info on the internet about "re-chipping" the lens....but, looks like too much to gain little.
This lens will work with Canon cameras. I use one on my Canon 30D. It is a fixed F8 you can not use auto or green box because there are not any contacts on the lens to talk to the camera. Its back to the basics manual adjust shutter and ISO to the get a correct exposer. DEFINITLY NOT A POINT AND SHOOT LENS.