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07-28-2012, 07:50 PM   #1
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KAF3, KAF2, KAF or KA mount ...!

As a newbie to SLR, I have some problems understanding which lenses fits my K-5! This is what I reand when reading the specs on dpreview:

Lens mount:
• Pentax KAF2 bayonet mount
• Pentax KAF3, KAF2, KAF or KA mount lenses
• Pentax K mount lenses with restrictions

When I search for used lenses on the net, I see (ex.) these terms:

- SMC Pentax-A 1.7 50mm lens (P/K-A mount)
- Pentax SMC P A 16mm f/2.8 Lens
- Sigma 28mm F2.8 PK-A Fitting for Pentax DSLRs, K7 K5 K10d *
- Pentax SMC P DA 18-55mm f/3.5-5.6 AF AL

I simply don't understand which lenses fits my camera when searching the net :-( It's a jungle out there

If you look at the third example, the PK-A is not present at the lens-mount spec. from dpreview, but the seller says it will fit a K5! I'm confused.

Can anybody enlighting me

Kind regards


07-28-2012, 08:05 PM   #2
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They will all fit your camera. The differences are in what mechanical/electronic features are enabled but they will all physically fit and work on your camera. Until you know more just avoid the K-R or Ricoh K mount lenses with the imfamous Ricoh Pin and you'll be safe.

Try this chart:
The Pentax Camera Lens Compatibility Chart

Wikipedia also has a guide:
Pentax K mount - Wikipedia, the free encyclopedia

More detail about the evolution of the K Mount:
Summary of the K-Mount Evolution, Names, and Features
07-28-2012, 11:48 PM   #3

Join Date: Sep 2011
Location: Nelson B.C.
Posts: 3,247
In the back of the K-5 manual there is a table showing available function to each lens type. What you want to watch for are the families of lenses. M, K, A, F and D. Throw in M42 for the old screwmount. Each has its abilities and variations, but broadly will give you an idea what you will get. Usually third party stuff will match, such as the pka adaptall mounts giving A function.

The mount type will correspond to the various families of lenses and are a more technical description.

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