Hi guys i've just bought a Sigma 55-200mm F4-5.6 DC AF of ebay and when fitted to my 400D it hunts back and forth erratically and is really quite unusable and just wont focus when my other lens do.
Help!!! Any ideas what i can do to fix it. Im doing my nut!
Help!!! Any ideas what i can do to fix it. Im doing my nut!