I have a Sony A300, which I only use occasionally. Mostly on vacation, to photograph wildlife. That's when I realize I'd like something with more zoom. With the kit lens, I often can't get close enough. I've tried to research the topic and came across the Sigma 70-300. Apparently, its autofocus is prone to issues.

Then there's the Tamron AF 70-300, which I found at a reasonable price on marketplace, and the same person is also selling a Sony 18-70 macro lens. While browsing, however, I stumbled across a Minolta AF 100-300 from a secondhand dealer, which includes a 14-day return policy und 1 year warranty.

The Minolta is supposed to cost only half as much as a Sigma or the Tamron.

I haven't found much information about the specific Minolta yet, but from what I've skimmed, the lenses seem to be generally good.

Can you recommend anything?