Tamron Adaptall-2 on K5ii?

Started Apr 16, 2014 | Questions thread
OP SirSeth Veteran Member • Posts: 9,910
Re: Tamron Adaptall-2 on K5ii?

KentG wrote:

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

Thanks Kent,

This is very helpful specific info about the mount types. I'm curious, what other great MF lenses did you or do you currently use? I'm not well versed in options for Pentax mount.

The 35-80mm f2.8-3.8 I have is actually really good. Sharp, good color, and focuses surprisingly close for a non-macro. I think there may be a 35-80mm with different aperture range which is not as good. I've used two copies of the SP 90mm f2.5 and one was stunning while the other was just ok, so maybe there is sample variation too. I must have a good one.

I'll look into the 35-210mm.



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