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02-15-2010, 07:35 PM   #1
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SMC M 35mm F 2.8

I just picked up this lens and haven't really had a chance to test it, but my question is this; I was under the assumption that the K and M glass are fo the same optical formula, so why is the rating for the K version of this lens higher than the M version?

02-15-2010, 07:55 PM   #2
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The Ks are often similar to Takumar lenses of the same focal length, but for the most part the Ms were new optical formulas - that's part of the reason why M series lenses are smaller than a K of the same focal length. Certain M series optical designs then carried on through the A, F and FA series of lenses.

If you're looking at the rankings in the database here on the forum the M has one low score (a 5) and only 3 entries in total, which drags down the average. One lens is given as 6 elements in 6 groups, and the other as 5 in 4 groups with a diffeent speed, so they use different optical formulas
02-15-2010, 09:56 PM   #3
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the K has 8 elements, while the M has only 6. so they are not really have the same optical formula.
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