The following image represents the winning post for the April 2024 award for Macro. It was originally posted at https://www.photomacrography.net/forum/viewtopic.php?t=43577 . Please discuss in its original thread, with cross-references as needed. Thanks! --Rik Lens test wafer ( RobertOToole ) https:...

In the Photomacrography Forums, we honor the recently deceased Robert OToole for his long history of technical contributions and personal friendships in this community. The front page image is a lens test wafer, from https://www.photomacrography.net/forum/viewtopic.php?t=43577 . In the Photomicrogra...

In the Photomacrography Forums, we honor the recently deceased Robert OToole for his long history of technical contributions and personal friendships in this community. The front page image is a lens test wafer, from https://www.photomacrography.net/forum/viewtopic.php?t=43577 . In the Photomicrogra...

In the Photomacrography Forums, we honor the recently deceased Robert OToole for his long history of technical contributions and personal friendships in this community. The front page image is a lens test wafer, from https://www.photomacrography.net/forum/viewtopic.php?t=43577 . In the Photomicrogra...

Mitutoyo 5x (notice that here there are more details on the spider's hairs than on the 10x) I downloaded the full resolution pictures from Flickr and did some study. What I see depends on the scale that I look. Here is a screen capture of Photoshop, showing corresponding areas from the 10X HR at 20...

A very pleasing image indeed!

I look forward to hearing the story of the modding of your macro setup.

I also note "tilted back 35-40 degrees", so of course I would love to see stereo. <insert begging puppy emoticon here>

--Rik

I am mystified by the software used here and can not figure out how to move the appropriate 6x image here. If any moderator would care to fix it for me, I would appreciate it. I'll be happy to help, if the problem has not already been solved. At the bottom of the thread I see a "6x adding 26mm tube...

This is not a real poster. Maybe. But it's not a slam dunk. On the side of "not a real poster", we see broken English and IP addresses that trace to China while the nominal address is Los Angeles. On the other side, the website that appears in the signature does exist, talks about spiders, has a "c...

I will wait for somebody else to pitch in about that (like Rik who is good in crunching numbers) Not me. If somebody else can make sense of the magnification/extension/FL weirdness, I would be interested to hear. But I can't make the numbers work either, and given the optical performance it's not w...

Wonderful photos, as always! The feeding leech is especially remarkable! I've never seen that. I am confused about the ID. If I'm looking at the right photo, Paul calls it a "land planarian". But Wikipedia tells me that "leech" is phylum Annelida, while planarian is phylum Platyhelminthes. Visually ...

In quick search, the most relevant thing I found was https://smallpond.ca/jim/photomicrography/focusAnalyser/howto.html . It uses a web-based tool located at https://smallpond.ca/jim/photomicrography/focusAnalyser/index.html . I checked that the tool seems to be live, but did not attempt to test it ...

Very interesting! This is definitely a case where I needed to see the full resolution image to make sense of what I'm seeing.

--Rik

As far as I understand internal focusing causes a shortening of the effective focal length but I think it somewhat more complex. Correct on both counts. In addition to changing the lens's focal length, internal focusing almost always changes the spacing of two "principal planes" from which optical ...

At present I see your photos are listed as "not downloaded yet." That said, your 1/1.8" sensor size should do OK with around a .5x reduction lens fitted ahead of a C-mount camera (if that's how your camera is mounted). That assumes your AmScope microscope doesn't already have a photo relay lens in ...

Will be back in town in the later part of next week (attending annual pathology conference in Baltimore, MD). I will re-run same test using my old Micro Nikkor 55 mm and again 60 mm Nikkor lens at 5.6 and 8.0 and post some images... Enjoy your conference! I expect that a snapshot of your setup woul...