JML 26 mm f/4.5, first short test

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enricosavazzi
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Location: Västerås, Sweden
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JML 26 mm f/4.5, first short test

Post by enricosavazzi »

A first short test of the JML 26 mm f/4.5, compared to the JML 21 mm f/3.5. The subject is a laser printout, Nikon D300s with 90 mm extension to lens mount.

JML 21 mm, full picture reduced
Image

JML 26 mm, full picture reduced
Image

JML 21 mm, detail 1:1 (near the top left corner)
Image



JML 26 mm, detail 1:1 (near the top left corner)
Image

This is not an exhaustive test, but it seems to show that the performance of the two lenses is rather similar. There is a difference in theoretical max resolution in favor of the 21 mm (at the same magnification) because of the lower f/ratio, but this difference is not substantial. In fact, my calculations show that both lenses can be used to approx. 5x before becoming diffraction-limited in a visible way.

The subject is not plane and not in focus in the whole frame, and there are other shortcomings as well. Nonetheless, the results look promising.

And last, a non-stacked image with the 26 mm (the subject is scales on a curculionid beetle), reduced and 1:1 detail
Image

Image

The odd thing about the last test is that the curculionid pictures were taken with a Mitutoyo FS-60 microscope equipped with zoom infinity lens (set to 1x for this picture), so the test is not fair - but the JML 26 mm still produces rather acceptable results, at least in the center of the frame. Magnification is also higher than optimal (around 8-10x).
--ES

Craig Gerard
Posts: 2877
Joined: Sat May 01, 2010 1:51 am
Location: Australia

Post by Craig Gerard »

Enrico,

Thank you for posting.

Reading the JML 26/4.5 reports with interest.

Your initial results are encouraging.



Craig
To use a classic quote from 'Antz' - "I almost know exactly what I'm doing!"

jojm
Posts: 55
Joined: Sun Jul 08, 2007 7:37 am
Location: France

Post by jojm »

Hi to all,
Thanks to Enrico, I got one of this JML 26mm.
This is my first test with this lens.
Really happy with the result and specially with the bokeh that I obtain.
Some chromatic aberrations appeared (blue-red ones) in the corners.

Image
Saléeite from La Commanderie, Deux-Sèvres, France
Canon EOS 50D, extension 125mm, JML 26mm/4.5
FOV: ca 5mm
30 images (0.04mm spaced) stacked with CombineZP.

Jean-Marc

Craig Gerard
Posts: 2877
Joined: Sat May 01, 2010 1:51 am
Location: Australia

Post by Craig Gerard »

Jean-Marc,

The clarity of the crystal is superb.......crystal-clear, you might say and the bokeh is rather smooth as you have mentioned.

CombineZP appears to have had difficulty with certain areas of this image. Which stacking method did you use in CombineZP?


Craig
To use a classic quote from 'Antz' - "I almost know exactly what I'm doing!"

jojm
Posts: 55
Joined: Sun Jul 08, 2007 7:37 am
Location: France

Post by jojm »

Craig Gerard wrote: Which stacking method did you use in CombineZP?
"Align & Balance" + "Do Stack".

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