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High-Resolution Line Scan Lenses - Comparison of results
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Lou Jost



Joined: 04 Sep 2015
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PostPosted: Tue Nov 21, 2017 11:50 am    Post subject: Reply with quote

Many things about this lens make sense if it came from this mini-stepper. The mini-stepper is designed for coarser but thicker photoresist patterns, so depth of field is important. Hence the low NA, and this also explains the presence of an adjustable aperture.

Also, my rough measurement of the image circle (made before I found this document) was ">50mm" and the expected image circle of the mini-stepper lens is 55mm.
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kds315*



Joined: 02 Feb 2009
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PostPosted: Tue Nov 21, 2017 12:09 pm    Post subject: Reply with quote

Lou Jost wrote:
Many things about this lens make sense if it came from this mini-stepper. The mini-stepper is designed for coarser but thicker photoresist patterns, so depth of field is important. Hence the low NA, and this also explains the presence of an adjustable aperture.

Also, my rough measurement of the image circle (made before I found this document) was ">50mm" and the expected image circle of the mini-stepper lens is 55mm.


Well, looking forward to seeing your results!
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Klaus

http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
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Sager



Joined: 09 Jan 2015
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PostPosted: Thu Nov 23, 2017 7:48 am    Post subject: Reply with quote

Very interested in what you find on the Nikon lens.

I was looking at this, glad to know one went to a good place. I'm interested in the other one if it has a decent IC.

Jonathan
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Lou Jost



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PostPosted: Thu Nov 23, 2017 7:50 am    Post subject: Reply with quote

I can quickly look at the IC later today for you.
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Sager



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PostPosted: Tue Jan 02, 2018 3:59 pm    Post subject: Reply with quote

Lou Jost wrote:
I can quickly look at the IC later today for you.


Any luck checking IC? How's it going with the lens? If it has a 55mm IC it would just barely cover a 44x33 sensor.
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Sager



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PostPosted: Tue Jan 02, 2018 4:05 pm    Post subject: Reply with quote

RE: Green light:

I was just visiting a friend who has a few of these lasers: https://www.arrowheadforensics.com/a-1143728-coherent-tracer-laser-8w-green-532nm.html

These would be the ultimate green laser light source. Fairly low speckle but I'm still wondering how the light quality would work photographically on an e-line lens and a monochrome sensor like the 100MP achromatic. Might have to borrow a laser, a Phase One achromatic digital back and shoot with the 155mm UMN to see what the results are like Smile
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kds315*



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PostPosted: Tue Jan 02, 2018 4:22 pm    Post subject: Reply with quote

Sager wrote:
RE: Green light:

I was just visiting a friend who has a few of these lasers: https://www.arrowheadforensics.com/a-1143728-coherent-tracer-laser-8w-green-532nm.html

These would be the ultimate green laser light source. Fairly low speckle but I'm still wondering how the light quality would work photographically on an e-line lens and a monochrome sensor like the 100MP achromatic. Might have to borrow a laser, a Phase One achromatic digital back and shoot with the 155mm UMN to see what the results are like Smile


A 10-20nm narrowband green filter (Omega Optical etc.) in front of that taking lens plus sunlight would be too simple? Does it need to be that complicated to work for you? ;-)
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Klaus

http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
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Sager



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PostPosted: Tue Jan 02, 2018 4:36 pm    Post subject: Reply with quote

To be honest there is an opportunistic motivation to assemble so much gear in one place and see what kind of creative imaging could happen Smile To really use it I will have to read up on fluorescence imaging and forensic techniques to justify the favors I would have to pull and time I would devote to testing the creative and technical merits of the individual components.

I just visited a friends Bioimaging and Neurophotonics laboratory in Berlin and feel motivated to expand my technical/creative capabilities to include a broader range of imaging techniques http://www.jlab.berlin/ Visiting the lab and talking to Benjamin opened up my mind to alternate imaging methods beyond the visible spectrum and conventional techniques.
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kds315*



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PostPosted: Tue Jan 02, 2018 4:44 pm    Post subject: Reply with quote

Sager wrote:
To be honest there is an opportunistic motivation to assemble so much gear in one place and see what kind of creative imaging could happen Smile To really use it I will have to read up on fluorescence imaging and forensic techniques to justify the favors I would have to pull and time I would devote to testing the creative and technical merits of the individual components.

I just visited a friends Bioimaging and Neurophotonics laboratory in Berlin and feel motivated to expand my technical/creative capabilities to include a broader range of imaging techniques http://www.jlab.berlin/ Visiting the lab and talking to Benjamin opened up my mind to alternate imaging methods beyond the visible spectrum and conventional techniques.


Nothing wrong about broadening one's know how!!! Great you had the chance to do so (impressive work they do there!). I was just wondering why you proposed such a complicated way - now I know and understand ... :-)
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Klaus

http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary


Last edited by kds315* on Tue Jan 02, 2018 5:00 pm; edited 1 time in total
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Lou Jost



Joined: 04 Sep 2015
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PostPosted: Tue Jan 02, 2018 4:51 pm    Post subject: Reply with quote

It is not really hard. Perfect monochromaticity coupled with high intensity makes laser light far better than filtered sunlight. You can buy lasers just as good for photography as that $48000 for about $30-$60. You want multiple small lasers, not one big one, so you can adequately distribute the light. You also need to despeckle it. See my posts about my simple milk-based DIY despeckling techniques.

I did do some first tests of the lens. I am pretty sure it is an h-line lens, so very cheap "blue-ray" lasers at 405nm are the appropriate ones, and these are readily available. The resolution of the lens is incredible. I had to stop it down a bit though. It was soft wide open (surprising for a semiconductor litho lens). This lens would far out-resolve the medium-format sensor, except possibly in the corners (which I did not yet check). See
http://www.photomacrography.net/forum/viewtopic.php?t=36178&highlight=
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Sager



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PostPosted: Wed Jan 03, 2018 1:05 pm    Post subject: Reply with quote

Thanks for the link Lou! Your technique for despeckling is fascinating and informative of the challenges present for using laser light sources for imaging. I'll respond to that thread later.

The forensics lasers are overkill (to put it mildly) for macro imaging. They would be better suited for something approaching close focus or conventional focus distances. That however is a topic for another forum.
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Lou Jost



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PostPosted: Wed Jan 03, 2018 2:56 pm    Post subject: Reply with quote

The forensic lasers really are overkill, and it seems that they ignore the despeckling. I love my cheap lasers and milk despecklers!
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