My sigma 28-200 have problem with shutter problem my canon eos 450 cannot set more than f3.5 bcoz there are error01

If the lens is compatible with your Canon, the only thing I can think of is a defective chip or a bad connection inside the lens.
just bring it back to the shop you bought it.

Sigma makes their lenses with a variety of camera mounts. If you get the lens with a Canon mount then yes, it will fit any EOS Rebel camera body. A lens with a Pentax mount, for example, will not fit a Canon camera.

Sigma makes lenses with a variety of camera mounts. A lens with a Pentax mount, for example, will not fit onto a Canon camera. Assuming you get the lens with the Canon mount, then it will work on the EOS 350D with full functionality.

Yes, if you get one with a Canon mount. Sigma makes their lenses available with a variety of mounts; a lens with a Nikon mount, for example, will not fit on a Canon camera.

Hi
To test if it is compatible put the lens on the camera set to AV and the iris to f16/22 use the stopdown
button if it stops down works you ok but if not it would need a rechip but that no longer avabile best
call sigma

It will default to manual through the viewing screen. It will only work on automatic, using the viewfinder. Make sure you also set the focal length (lens to shutter distance). You might also have a mf / af switch on the lens. This also only works through the viewfinder.

Hi Is the 28-70 a DF type if so it will work on a canon DSLR but if its the older one with the scale ring is on the outside of the lens it will need a rechip but I think thay are no longer avabile the 70-300 if is a super it will work or need a rechip if its a older one with a macro switch held on the lens with 2 screws it to old to up grade

Set the shutter mode to "M" to control all funtionality of camera. NOTE: The Rokinon 500mm f8.0 don't have control of the f-number but is loked on the lenses, is unique. I hope i'm helpfull. ENJOY your lenses! i have the same!

if the motor is running but the focus is not moving the scale ring may be damage it will need to go to sigma uk

http://web.canon.jp/imaging/eosd/eosdigital4/specifications.html

First off, welcome to the world of photography! Good luck and have fun!!!

Like any slr, you have the option of Manual exposure. I'm not familiar w/ modern Canons (I use Nikon). According to this page, however, you also have aperture priority and shutter priority. I'm pretty sure ALL modern Canons have bracketing modes as well (Use this for HDR).

I couldn't find the 450 manual (I'm assuming Canon's web devs are behind), but I did find the instruction manual for the 400 :

http://gdlp01.c-wss.com/gds/0900000357/EOSDRXTi400DIM-EN.pdf

Should be similar, probably w/o some of the functions. Although you SHOULD have a book w/ your camera ;). Read it thoroughly.

Ok, according to the 400 manual, put your camera into Manual mode, then adjust the regular dial to adjust shutter speed. Then, to adjust aperture, hold in the A/V button while you adjust the same dial.

Like I said, may be a bit different. I think the dial may even be digital buttons rather than analog...

hope this helps!!!