Search found 2940 matches

by Chris S.
Fri Apr 16, 2021 4:30 pm
Forum: Equipment Exchange
Topic: SOLD OUT - Mitutoyo M Plan APO 5x (unused)
Replies: 16
Views: 282

Re: SOLD OUT - Mitutoyo M Plan APO 5x (unused)

States like California has 7% import duties. . . . No. In the United States, individual states don't have import duties, due to a strong bar against this in the U.S. constitution. While very specific exceptions can exist with authorization of the U.S. Congress, for nearly all purposes relevant to i...
by Chris S.
Thu Apr 15, 2021 11:49 pm
Forum: Equipment Exchange
Topic: SOLD OUT - Mitutoyo M Plan APO 5x (unused)
Replies: 16
Views: 282

Re: Mitutoyo M Plan APO 5x (unused)

I agree with Lou. Thanks, MiB, for alerting us to your find! :D Also, rest assured that when one makes a post that is obviously intended for the benefit of other forum members, the admin team is not looking for opportunities to find fault. Brad, for buyers in the U.S., import fees on a 300 Euro, Jap...
by Chris S.
Thu Apr 15, 2021 4:09 pm
Forum: Equipment Exchange
Topic: SOLD OUT - Mitutoyo M Plan APO 5x (unused)
Replies: 16
Views: 282

Re: Mitutoyo M Plan APO 5x (unused)

I don't see any rules violations, here.

--Chris S.
by Chris S.
Tue Apr 13, 2021 1:15 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: High key contrast method (post-processing tip)
Replies: 9
Views: 338

Re: High key contrast method (post-processing tip)

Steve, I had also thought of the "L" in lab as standing for "Luminance," but my version of Photoshop calls it "Lightness." Wikipedia indicates that in Lab color, lightness is a derivative of luminance: "The lightness value, L* in CIELAB is calculated using the cube root of the relative luminance wit...
by Chris S.
Mon Apr 12, 2021 10:22 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: High key contrast method (post-processing tip)
Replies: 9
Views: 338

Re: High key contrast method (post-processing tip)

Steve, Similar but simpler? In Photoshop: 1. Convert image from RGB color to Lab color (Menu: Image>Mode>Lab color) 2. Isolate lightness channel (Channels palette: Turn off Lab, a, and b, leaving on "Lightness") 3. Adjust lightness channel (For example--Menu: Image>Shadows/Highlights>Shadows 35%, Hi...
by Chris S.
Wed Apr 07, 2021 11:12 pm
Forum: Beginners Macro
Topic: Abbreviations for equipment and technicues
Replies: 8
Views: 158

Re: Abbreviations for equipment and technicues

I've also, for some time now, found our forum's content almost impossible to find using Google. Even posts of my own, for which I know of course the author and specific word phrases used, no longer come up. They used to appear very reliably. I've found this both annoying and alarming. My own sense h...
by Chris S.
Wed Apr 07, 2021 10:45 pm
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 385

Re: A7r4 pixel shift. Rather a resolution eye-opener

Steve, Any chance we could see a comparison between an image without pixel shift, an image with 4-shot pixel shift, and an image with 16-shot pixel shift? Perhaps made with whichever objective shows the improvement most dramatically? Perhaps resized as necessary for easy comparison? I fear that's as...
by Chris S.
Thu Apr 01, 2021 11:51 pm
Forum: Photography Through the Microscope
Topic: Onion
Replies: 16
Views: 3171

Re: Onion

Brilliant thread, Saul! =D> Your onion image is enchanting, and your Sanderson prism prototypes are very intriguing. I'd never heard of Sanderson prisms, but the papers you reference suggest they may permit very low-cost DIC photomicrography--apparently a track you're pursuing elegantly. Are the app...
by Chris S.
Mon Mar 22, 2021 6:02 pm
Forum: Equipment Discussions
Topic: 20x Finite Objective Suggestions
Replies: 7
Views: 673

Re: 20x Finite Objective Suggestions

WD is 3mm or so, which is more than enough unless you need to photograph minerals inside rock cracks I would violently disagree that 3mm is "more than enough" working distance for most macro. True, an experienced photographer can make 3mm work sometimes for some subjects. But such shallow working d...
by Chris S.
Mon Mar 22, 2021 4:49 pm
Forum: Equipment Discussions
Topic: 20x Finite Objective Suggestions
Replies: 7
Views: 673

Re: 20x Finite Objective Suggestions

From your experiences what would be a good starting out 20x, finite, objective be? Owen, The classic answer is the Nikon CF Plan 20/0.40 210/0 ELWD achromat, which has a working distance of 10.5mm. You can see it listed in the Nikon brochure here . There are two of them pictured in the fifth image ...
by Chris S.
Sun Mar 14, 2021 11:56 pm
Forum: Equipment Discussions
Topic: Recommendations: 10x+ finite objective
Replies: 5
Views: 700

Re: Recommendations: 10x+ finite objective

Owen, I wouldn't get hung up on Nikon BD versions vs. non-BD--in many cases, Nikon offered objectives with identical optics in both BD and non-BD versions. As you may know, "BD" indicated "Brightfield/darkfield" designated not the optics, but the barrel of the lens.The BD version has a fatter mount,...
by Chris S.
Sun Mar 14, 2021 11:32 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 53
Views: 55189

Re: Laser aiming and focus in photomacrography

Physicsmajor, excellent addition! :D Thanks for documenting/sharing this.

--Chris S.
by Chris S.
Fri Mar 12, 2021 11:21 pm
Forum: Equipment Discussions
Topic: Thorlabs SM2 or Novoflex Micro-Tube?
Replies: 9
Views: 842

Re: Thorlabs SM2 or Novoflex Micro-Tube?

Nancy, welcome to posting! :D (A couple of housekeeping details: I admin-edited the URL in your post, as the original did not connect when I tried it. I also removed the duplicate post in the studio and technical image gallery--here is the best place for your thread.) The new Novoflex product--liste...
by Chris S.
Tue Mar 09, 2021 5:32 pm
Forum: Equipment Discussions
Topic: Stacked lenses and chromatic aberration...
Replies: 13
Views: 1099

Re: Stacked lenses and chromatic aberration...

I can confirm that the Micro-Nikkor 200mm f/4 IF-ED makes a very good converging lens for Mitutoyo objectives, both optically and mechanically (it is a big, solid lens with a mounting ring and foot). In my experience, it will cover 35mm full frame without darkened corners, though my general preferen...
by Chris S.
Wed Mar 03, 2021 10:55 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Purslane (Portulaca oleracea) seeds
Replies: 19
Views: 1633

Re: Purslane (Portulaca oleracea) seeds

Capital work! :D

Once again, photography in the proper hand shows me--in an entirely new light--something I've seen many times and taken no notice of.

I'd beware planting this in one's garden, though--I've battled it as an aggressive and pernicious weed.

--Chris S.