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12-02-2008, 01:01 PM   #16
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If you go here Pentax Normal Prime Lenses and compare the elements and lay-out, there is not a lot of difference in the optical formula and number of elements and shape among the Pentax 50 f1.4 lenses whether it is the K, M, A, F or FA. The same holds true with the f1.7 Pentax lenses.

Here is the M 50mm f1.4



Here is the FA 50mm f1.4



Edit: Here is the 50mm f1.4 SMC Tak from around 1971




Last edited by Blue; 12-02-2008 at 01:33 PM.
12-02-2008, 01:06 PM   #17
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To stir the pot a little, here is the new DA* 55 f1.4 which is a completely new design with 9 elements in 8 groups.

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