www.photomacrography.net :: View topic - For informationen, there is a Swedish test site
www.photomacrography.net Forum Index
An online community dedicated to the practices of photomacrography, close-up and macro photography, and photomicrography.
Photomacrography Front Page Amateurmicrography Front Page
Old Forums/Galleries
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
For informationen, there is a Swedish test site

 
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Equipment Discussions
View previous topic :: View next topic  
Author Message
JH



Joined: 09 Mar 2013
Posts: 1170
Location: Vallentuna, Stockholm, Sweden

PostPosted: Sat Nov 03, 2018 4:59 pm    Post subject: For informationen, there is a Swedish test site Reply with quote

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-canon-ef-100-mm-f28-l-is-usm-macro/

Pentax D-FA 100 mm f/2,8 Macro WR
http://www.objektivtest.se/tester/pentax-d-fa-100-mm-f28-macro-wr-test/

Samyang MF 100 mm f/2,8 ED UMC
http://www.objektivtest.se/tester/samyang-mf-100-mm-f28-ed-umc-macro-test/

Sigma APO Macro 180 mm f/2,8 EX DG OS HSM
http://www.objektivtest.se/tester/sigma-apo-macro-180-mm-f28-ex-dg-os-hsm-test/

Sigma APO Macro 150 mm f/2,8 EX DG OS HSM
http://www.objektivtest.se/tester/sigma-apo-macro-150-mm-f28-ex-dg-os-hsm-test/

Sigma 105 mm f/2,8 EX DG OS HSM Macro
http://www.objektivtest.se/tester/test-sigma-105-mm-f28-ex-dg-os-hsm-macro/

Tamron SP AF 90 mm f/2,8 Di Macro
http://www.objektivtest.se/tester/test-tamron-sp-af-90-mm-f28-di-macro-en-narbildsklassiker/

Tamron SP 90 mm f/2,8 Di VC USD Macro version II
http://www.objektivtest.se/tester/test-tamron-sp-90-mm-f28-di-vc-usd-macro-version-ii/

Tokina AT-X 100 mm f/2,8 Pro D
http://www.objektivtest.se/tester/tokina-at-x-100-mm-f28-pro-d-macro-test-ett-gediget-bygge/

Zeiss Milvus 100 mm f/2 Macro
http://www.objektivtest.se/tester/zeiss-milvus-100-mm-f2-macro-test-makrotele-av-hogsta-klass/
_________________
J├Ârgen Hellberg, my webbsite www.hphoto.se
Back to top
View user's profile Send private message Visit poster's website
johan



Joined: 06 Sep 2011
Posts: 996

PostPosted: Sun Nov 04, 2018 11:39 am    Post subject: Reply with quote

Thanks John, useful
_________________
My extreme-macro.co.uk site, a learning site. Your comments and input there would be gratefully appreciated.
Back to top
View user's profile Send private message Visit poster's website
RobertOToole



Joined: 17 Jan 2013
Posts: 1009
Location: United States

PostPosted: Sun Nov 04, 2018 2:24 pm    Post subject: Reply with quote

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
Back to top
View user's profile Send private message Visit poster's website
elimoss



Joined: 12 Sep 2018
Posts: 26

PostPosted: Thu Nov 08, 2018 2:19 pm    Post subject: Reply with quote

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.
Back to top
View user's profile Send private message
RobertOToole



Joined: 17 Jan 2013
Posts: 1009
Location: United States

PostPosted: Thu Nov 08, 2018 7:29 pm    Post subject: Reply with quote

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 Very Happy
Back to top
View user's profile Send private message Visit poster's website
elimoss



Joined: 12 Sep 2018
Posts: 26

PostPosted: Fri Nov 09, 2018 9:40 am    Post subject: Reply with quote

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 Very Happy


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/2016/08/more-photogeekery-finite-conjugate-mtf-bench-tests-for-macro-lenses/
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Equipment Discussions All times are GMT - 7 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group