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Forum: Pentax SLR Lens Discussion
10-24-2018, 09:49 PM
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I have one.
Great build, as all other AT-X/AT-X Pro lenses.
It has zoom creep though.
Good stopped down, not so good wide open. Not surprising, most fast film era zooms are the same.
From my personal experience I'd favor the Tamron, if you really want a bulky f/2.8 AF zoom.
Optical quality is very good for the price.
The only problem I have is that it front focuses on my K-1. A correction of 10 is not enough to make it right at the long end.
Worked great on the K-5 II.
I should have it fixed.
IF you are okey with a slower zoom, the best vintage tele zooms made by Pentax are the Pentax-A 70-210mm and the Pentax-F 70-210mm.
The latter has screwdrive AF and is not much more expensive than the A version.
If you are fine with the way F lenses look/work, it's a good choice.
For some reason a certain number of them have fungus or lens separation. Finding a good example should be quite easy, just check the state of the optic.
The old Pentax-FA f/2.8 is not worth its (high) price IMHO... unless you are a die-hard pentaxophile collector.
The Sigma is not cheap either, but it's reportedly very good and the HSM version has fast AF. Never tried it but my HSM lenses focus fast and precise on my K-1.
If f/3.5 on the whole zoom range is enough, let's not forget one of the best MF zooms ever: the Tamron SP 70-210mm model 19AH.
It has a great macro (the Pentax-A does not) and has very good image quality at close range. With the PK/A Adaptall-2 ring it practically works as a Pentax-A lens... you got to focus manually :)
Considering everything, I'd either go for the Tamron or the Pentax-F. Unless you are already very comfortable with manual focusing.
If not, I'd suggest to start with an MF prime that could be purchased with some of the money you'd save going for one of the least expensive AF options.
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