Originally posted by rrstuff I have a manual focus Tokina 80-200 F3.5-4.5, which is pretty good and for 25 bucks. I am looking for something like that, but with a rudimentary autofocus.
That's easy, then. In this case, I recommend the SMC Pentax DA 55-300mm.
According to
this post, the range of the 55-300 is as follows:
55-125 = 4.0
125-200 = 4.5
200-275 = 5.6
above 275 = 5.8
So from 55-200 you basically have a f4-f4.5 lens. Think of the extra 100mm as a great bonus. And no rudimentary AF here
Also, this lens should outperform any old manual zoom you have, contrast and sharpness are very good by all accounts and reviews. Eventually I'll replace my Tamron 70-300 with it.
For manual focus, I recommend the SMC Pentax-A 70-210mm f/4. I have one and I still use it quite a bit more than my Tamron 70-300 AF, the quality is just noticeably superior. A great lens.