75mm Lens Shootout

Some while ago, compared the central resolution of an Olympus 80mm f/4 bellows lens with a 75mm APO-Rodagon D 1x lens, both at 1x magnification using a 1951 USAF test chart. Just looking at the image captured directly by the Canon T6s sensor shows that the central resolution of the overall system is essentially the same for both lenses at f/4 and f/5.6 (f/8 and f/11 effective): about 80.6 lp/mm. This is about 3 pixels on the camera sensor, which is about all you can expect, especially with the Canon T6s anti-aliasing filter.

In order to show the superiority of the APO-Rodagon, I needed to use the Rick Littlefield technique using a 10x Mitutoyo microscope objective to photograph the areal image of the two lenses. This technique removes the camera sensor as the limiting factor in measuring resolution, and is described in an old thread over at Photomacrography.net

Using the 10x objective, the actual lens resolution for the Olympus lens is about 181 lp/mm at f/4 and the resolution of the APO_Rodagon at f/4 is about 203 lp/mm. At f/5.6, both lenses show a resolution of about 128-143 lp/mm according to the test chart.

Note that this test tells us nothing about field flatness or chromatic aberration, etc., and the results are valid only for the single copy of each lens that I have.

I didn't find it, unless you are referring to coinimaging.com, which compares many lenses, including the Olympus 80mm. Perhaps you could give us a term to do a Google search with, or type in the URL?

As for samples with the 80mm Olympus (on both good and bad days), check out the CCF thread "How far back can we go? Third Edition - 2015!" in the Main Coin Forum. I have uploaded many photos there starting on page 46 (1932).

Almost all of the photos that are not tagged with something like "scanned-in film prints" are taken with the Olympus 80mm lens and a modern Canon DSLR. The film prints were usually taken with a Nikon FE SLR and the 55mm Micro-Nikkor 55mm f/2.8 lens, and all were taken prior to 1998.

ok hope this works.http://macrosmuymacros.com/index.ph...-frame-test. I should have remembered how to do this. how do you guys get these links to show up in blue and all you have to do is click on it.