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03-29-2013, 02:25 PM   #1
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mlens or k how do u tell them apart

can u tell by ser .number ?

03-29-2013, 02:36 PM   #2
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The M lenses are labeled SMC PENTAX-M. The K lenses are labeled SMC PENTAX.

K Lens...

M Lenses...

03-29-2013, 02:45 PM   #3
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The complete lineups of both series are found here:
Pentax Lenses - Pentax Lens Reviews & Lens Database

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03-29-2013, 03:48 PM   #4
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Some filter-size trivia: All M-series prime lenses below 200mm take a 49mm filter. The M200/4 is the only M-series prime that takes a 52mm filter; the two longer M primes (*300/4 and 400/5.6) take 77mm. No K series prime lenses take a 49mm filter except for the 85mm f2.2 Soft.

It's not that helpful for online shopping because Pentax didn't engrave filter sizes on either series.

03-29-2013, 06:01 PM   #5
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m +k lens

looks like I have both then thanks for info
03-30-2013, 07:19 AM   #6
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QuoteOriginally posted by crashmars Quote
looks like I have both
It's good to know your LBA is nicely under control.

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