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we have a number of members who are from Canada
these charges might be helpful:
Pentax Lens Compatibility Chart
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Pentax bayonet lenses labeled "SMC Pentax" are referred to as "K" lenses in the table below. Other Pentax bayonet lenses have the lens designation as a part of their name as in "SMC Pentax-FA."
Note that "star" lenses work like their "non-star" counterparts: DA* lenses work like DA lenses, FA* like FA, F* like F, A* like A, and M* like M.
Exceptions: FA and F "soft" lenses behave like M lenses in terms of metering.
The Pentax Camera Lens Compatibility Chart
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Pentax K-Mount Lens Series Explained: The differences between various Pentax lens series
In a nutshell
There are several series of Pentax K-mount lenses; the ones currently being produced include the DA (digital), DA L (cheap digital kit), D FA (full-frame, digital optimized), and FA (full-frame) series. While all Pentax K-mount lenses ever produced are compatible with all current Pentax DSLRs (in some cases with restrictions in that not all exposure modes of the camera are supported by old lenses), there are significant differences between each lens series and each has different features. Furthermore some of the newer lenses do not work with older cameras. We'll be exploring the differences between the various K-mount series lenses in this article. Read more about specific K-mount lens/camera compatibility here.
The DLSR designation below encompasses the mirror-less K-01.
Pentax K-Mount Lenses Explained: The differences between various Pentax lens series
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nothing wrong with buying new but if $ is an deciding issue, there are lots of older models of Pentax Camera bodies which would be great to start with
the K 5 series, K 3 and K 3 II are worth looking at as well as others
Pentax Digital Cameras and Film Cameras - Pentax Camera Reviews and Specifications Pentax K-1 II vs. Pentax KP vs. Pentax K-70 - Pentax Camera Comparison - PentaxForums.com
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Pentax Lenses - Pentax Lens Reviews & Lens Database
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be sure to check out what " experienced " equipment is available from members in the market place
The Pentax Marketplace | Buy & Sell Pentax Cameras and Lenses - PentaxForums.com