P67 lenses: Hasselblad Ealing MTF tests on...

greenspun.com : LUSENET : Pentax 67 SLR : One Thread

I searched this page and did not find reference to the following website: www.photodo.com/index.html - and please excuse the double post if I missed it. The PhotoDo site includes the numerous lens test-results done by Nordlund at Victor Hasselblad AB; see the "Products" section for the results. This data, and this method of testing, might be of more interest to opitcal nuts than the average user. But, it is useful information nonetheless, and the results might prove useful to some or even many potential buyers of P67 equipment. I am not endorsing this measure or these results as the difinitive answer to any and all sharpness arguments; I am only adding more "facts" to the debate. If you are unfamiliar with MTF, click on the "Article" section, and browse through the three articles with MTF in the title (filed under "Equipment - Lenses"). If you are interested in optics in general, and/or the 35mm-medium-large-format debates, you might have particular interest in many or all of the articles there, by Lars Kjellberg. In many respects, the PhotoDo articles are not optional reading; unless you are knowledgable regarding optics, these explanations are essential to understanding what, exactly, is being measured, and why the tester believe it is what should be measured. And, by reading these articles, you get the full information on the test criteria and results-averaging which has been done to achieve a single number representing the lens "Grade". Who knows, you might also come to believe there are definite limitations to this type of lens test.

-- Michael Tolan (mjtolan@kbjrmail.com), June 20, 2001

Answers

Ratzlaff, do you mean LUSENET is out of date or this particular forum?

-- Steve Rasmussen (srasmuss@flash.net), June 21, 2001.

I frequent the site quite often.

However, my major complaint is that the site hasn't been updated with new information in more than a year. I know for P67 lenses this is really not an issue, but for other makes, Canon let's say, the site is a bit dated.

-- S Ratzlaff (ratzlaff@ticnet.com), June 21, 2001.


The Photodo site is out of date. Most pages haven't been updated since June 5th, 2000.

Like I said, that's O.K. for Pentax 6x7 since new lenses aren't introduced very often. However, the site doesn't really have ratings on most of the Pentax 6x7 lenses anyhow.

-- S Ratzlaff (ratzlaff@ticnet.com), June 21, 2001.


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