p.1 #1 · Sigma 70-300mm f/4-5.6 DG Macro Lens Vs Sony 75-300mm f/4.5-5.6
These lens are for Sony's A-mount DSLRs. I recently purchased Sony A65 and trying to pick a telephoto zoom lens. Please suggest me which one of these two will be good.
Suggest me any other lenses if they are better than these two. My budget is around $200.
p.1 #2 · Sigma 70-300mm f/4-5.6 DG Macro Lens Vs Sony 75-300mm f/4.5-5.6
Its a very tight budget, and both these lenses will have their weaknesses. You may also want to consider the Tamron AF 70-300mm f/4-5.6 Di VC USD, it costs around 400, but you get much better auto-focus and image stabilization.
p.1 #3 · Sigma 70-300mm f/4-5.6 DG Macro Lens Vs Sony 75-300mm f/4.5-5.6
Plus far better image quality with the Tamron.
Neither of the lenses you point to is very good. By all means go for the Tamron 70-300 VC.
This lens is pretty much the first lens purchased when people realize the kit lens doen't have much reach. It's also the lens put in the back of the closet and hidden when they see the poor image quality. Sony does make an excellent lens in about the same focal length, but this is NOT the good lens.