Tamron Adaptall-2 on K5ii?

Started Apr 16, 2014 | Questions thread
KentG Veteran Member • Posts: 4,494
Re: Tamron Adaptall-2 on K5ii?

You don't want the PK (actually called the KM adapter) because you would be treating your AD-2 lenses like they are M42 screw mount lenses or K and M K-mount lenses, mainly no electronic coupling. You lose electronic aperture control (same as Pentax A lenses) and all that entails. Only issue is that PK/A adapters go for over $100 on the used camera market. Back before I sold off my 400/4, 300/2.8, 180/2.5, 200-500/5.6 and smaller AD-2 lenses I had 4 PK/A adapters. Some were great and some had some wear (mainly in the locking pin hole). All worked although the worn ones required you to keep pressure on the lens coupling to keep the electronic pins aligned with the camera but that was all.

Of your lenses only the 35-80 is mediocre. Look for a 35-210/3.5-4.2 as it is better everywhere than that one.

Kent Gittings

 KentG's gear list:KentG's gear list
Pentax K-5 IIs Pentax K-S1 Pentax K-1 Pentax smc D-FA 50mm F2.8 Macro Pentax FA 150-450mm F4.5-5.6 +3 more
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