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11-13-2012, 09:37 AM   #16
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Thanks for answering!

Isn't lp/mm a measure of resolution rather than of contrast anyway, or am I missing something?

Best of all it would be nice to find MTF test for K and M mount lenses.

11-13-2012, 09:57 AM   #17
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QuoteOriginally posted by seppstefano Quote
Isn't lp/mm a measure of resolution rather than of contrast anyway, or am I missing something?
Line pairs per millimeter, as a spatial frequency,
is one of the coordinates for measurement, the other being contrast.
So a good lens may deliver a contrast of 50%
at a spatial frequency of 40 lp/mm
(at a certain part of the image field,
for a certain color of light,
when focused at a certain distance,
in a certain orientation, . . . It's complicated!)

QuoteOriginally posted by seppstefano Quote
Best of all it would be nice to find MTF test for K and M mount lenses.
I included Pentax' charts in my December 19, 2011 review of the M100/2.8:
SMC Pentax-M 100mm F2.8 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database

Photozone did a test on the K135/2.5:
Pentax SMC-K 135mm f/2.5 - Review / Lab Test Report - Analysis

You may find some others scattered in cyberspace.
11-13-2012, 10:00 AM   #18
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QuoteOriginally posted by lytrytyr Quote
I included Pentax' charts in my December 19, 2011 review of the M100/2.8:
SMC Pentax-M 100mm F2.8 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database

Photozone did a test on the K135/2.5:
Pentax SMC-K 135mm f/2.5 - Review / Lab Test Report - Analysis

You may find some others scattered in cyberspace.
Fine

thanks a lot for sharing these links.

Stefano
11-13-2012, 10:28 AM   #19
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I have not had K or M 50 1.4, but from what i've heard it is supposed to be better. i have the 8 element 50mm 1.4 and it is sharper at 1.4 than my 50A 1.7. It is VERY sharp! I hear the non SMC 7 element version is not as sharp but the SMC 7 element ones are also very sharp. THe only downfall of the 8 element version is that it is VERY prone to flare if you dont use a hood.

11-13-2012, 01:45 PM   #20
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This may be a couple of interesting links, too.

test_zeiss50

http://forum.mflenses.com/viewtopic.php?t=13521
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