Tamron 31A (200-500 5.6) vs Pentax 150-450 4.5-5.6

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gkreth Veteran Member • Posts: 3,128
Tamron 31A (200-500 5.6) vs Pentax 150-450 4.5-5.6

Hi, everyone!

I have dreamed on and off about getting a Pentax 150-450 f/4.5-5.6, mostly for birding and wildlife.

But it's expensive. Really, really expensive. (For me, anyway.)

I bought a Sigma 50-500 many years ago, and I was disappointed; it seemed very soft at the long end (I know most zooms are softer at the long end, but this copy was just too soft to be acceptable). It also had, well, kinda lousy contrast.

I was wondering about the old Tamron Adaptall 200-500 f/5.6.
I realize that it is MF.
But, it's also, like, one-fifth the price of the Pentax 150-450.

There aren't a whole lotta review on the Tamron, but what I have read seems to indicate that it is pretty sharp, even wide open.

Anyone here ever shoot with one?
Did you like the results?

Oh, I would be shooting this with a K3, and probably with a straight PK adapter. (I have a PKA, but TBH, it's kinda fiddly with the electronic contacts to the body.) I'll probably be shooting it wide open for the most part, because, well, at f/5.6 and where/when I'll be shooting, I don't think I'll be able to stop down much if at all.

Thanks for your opinions, comments, and advice!

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