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02-13-2011, 04:19 PM   #1
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lens series letter identification?

Hi, I was wondering if there is a link or some information about what all the different series letters (DA, D FA, FA FA J, F, A , M, K) mean? I'm just looking for a simple explanation on each.

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02-13-2011, 04:30 PM   #2
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Pentax K-Mount Lenses Explained: The differences between various Pentax lens series

See also a list of all the lenses: Pentax Reviews - Pentax Lens Reviews & Pentax Lens Database

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02-13-2011, 04:34 PM   #3
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DA is an APS-C only lens without an aperture ring.
D FA is a digital optimized lens that can be used on a full frame camera. Some have aperture rings, some do not. (DFA100mm f2.8 WR vs Non WR version for example).
FA is auto focus auto aperture, full frame format (FA31mm f1.8 Limited)
FA-J same as above but lacks an aperture ring.
F same as FA for all intents and purposes. The first round of autofocus lenses. Some say they are better than the FA counterparts.
A has an auto aperture but is a manual focus lens (you can use them in Av mode on your camera and it behaves just like the F and FA without autofocus).
M and K are full manual lenses. The K being the first generation of K mount lenses after the M42 Takumar lenses. Most from what I understand were carried over optical designs of the Taks and just given a new body. The M lenses are functionally the same.

02-13-2011, 05:44 PM   #4
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Thanks to both - that is very helpful information

05-02-2013, 06:09 PM   #5
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Thanks very useful for us new to Pentax
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