I am looking at a lenses for genereal use, mainly outdoor, wildlife as well if I can be quiet enough not to scare them away! I saw these on Amazon Sigma 28-70mm & 70-300mm AF Lens Set Digital SLR Camera's. What do you think, are they a good make, I'm not a pro so have not got a fortune to spend, but like some value for my money.
TIA
TIA