For informationen, there is a Swedish test site

Have questions about the equipment used for macro- or micro- photography? Post those questions in this forum.

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JH
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Joined: Sat Mar 09, 2013 9:46 am
Location: Vallentuna, Stockholm, Sweden
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For informationen, there is a Swedish test site

Post by JH »

There is a Swedish test site that have tests from the no longer published photo magazine "FOTO"and some times do new tests. They have posted MTF for some macros at 1:2. MTF 20 cycles/mm from center to corner on FF (0-21 mm) and MTF 30 cycles/mm from center to corner on APS-C (0-15 mm).

As far as I know they use testing equipment at Hasselblad and they say that the tests do not use a camera and therefore the tests can be used for comparison over a long time. The text is only in Swedish.

Canon EF 100 mm f/2,8 L IS USM Macro
http://www.objektivtest.se/tester/test- ... usm-macro/

Pentax D-FA 100 mm f/2,8 Macro WR
http://www.objektivtest.se/tester/penta ... o-wr-test/

Samyang MF 100 mm f/2,8 ED UMC
http://www.objektivtest.se/tester/samya ... acro-test/

Sigma APO Macro 180 mm f/2,8 EX DG OS HSM
http://www.objektivtest.se/tester/sigma ... -hsm-test/

Sigma APO Macro 150 mm f/2,8 EX DG OS HSM
http://www.objektivtest.se/tester/sigma ... -hsm-test/

Sigma 105 mm f/2,8 EX DG OS HSM Macro
http://www.objektivtest.se/tester/test- ... hsm-macro/

Tamron SP AF 90 mm f/2,8 Di Macro
http://www.objektivtest.se/tester/test- ... klassiker/

Tamron SP 90 mm f/2,8 Di VC USD Macro version II
http://www.objektivtest.se/tester/test- ... ersion-ii/

Tokina AT-X 100 mm f/2,8 Pro D
http://www.objektivtest.se/tester/tokin ... get-bygge/

Zeiss Milvus 100 mm f/2 Macro
http://www.objektivtest.se/tester/zeiss ... sta-klass/
Jörgen Hellberg, my webbsite www.hellberg.photo

johan
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Post by johan »

Thanks John, useful
My extreme-macro.co.uk site, a learning site. Your comments and input there would be gratefully appreciated.

RobertOToole
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Post by RobertOToole »

Good post, I had forgotten about this site.

Two strange things though, they ignore chromatic aberrations and they only show data for 20 cy/mm? Usually a manufacturer is trying to hide something when they show 10 or 20 cy/mm. When a manufacturer shares MTF for a really good lens they usually show 40-50-60 even 100 cy/mm.

Good reading anyway.

Robert

elimoss
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Post by elimoss »

Very interesting. I wonder why the MTF curves are smoothed if they are not simulated. Aren't they tested at discrete distances from the optical center? Maybe it's just a presentation thing.

RobertOToole
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Post by RobertOToole »

elimoss wrote:Very interesting. I wonder why the MTF curves are smoothed if they are not simulated. Aren't they tested at discrete distances from the optical center? Maybe it's just a presentation thing.
As far as I know slanted edge MTF measurement is actually an average MTF over that region. Its not a point measurement as far as I know, which isn't much about MTF :D

elimoss
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Joined: Wed Sep 12, 2018 11:31 am

Post by elimoss »

RobertOToole wrote: As far as I know slanted edge MTF measurement is actually an average MTF over that region. Its not a point measurement as far as I know, which isn't much about MTF :D
That might be part of it. I guess I am to used to reading the lensrentals blog where they plot points every 2mm from the center.

They did have an interesting macro article a couple years ago there, too
https://www.lensrentals.com/blog/2016/0 ... ro-lenses/

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