Search found 19970 matches
- Thu Mar 28, 2024 11:22 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: The pirate spider
- Replies: 11
- Views: 787
Re: The pirate spider
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...
- Thu Mar 28, 2024 7:06 pm
- Forum: Equipment Discussions
- Topic: Lens recomendation for film reproduction
- Replies: 62
- Views: 1283
Re: Lens recomendation for film reproduction
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...
- Thu Mar 28, 2024 1:39 pm
- Forum: Nature Photography -- Macro and Close-up
- Topic: Rio Bigal Reserve: Ecuador II
- Replies: 4
- Views: 95
Re: Rio Bigal Reserve: Ecuador II
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 ...
- Wed Mar 27, 2024 7:49 pm
- Forum: General Discussion Forum and Community Announcements
- Topic: Software LoCA analysis
- Replies: 3
- Views: 82
Re: Software LoCA analysis
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 ...
- Wed Mar 27, 2024 9:51 am
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Fossil diatoms in their natural habitat...
- Replies: 2
- Views: 79
Re: Fossil diatoms in their natural habitat...
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
--Rik
- Tue Mar 26, 2024 9:53 pm
- Forum: Equipment Discussions
- Topic: understanding working distance
- Replies: 3
- Views: 149
Re: understanding working distance
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 ...
- Sun Mar 24, 2024 3:35 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: What camera adapter for trinoclear microscope
- Replies: 11
- Views: 241
Re: What camera adapter for trinoclear microscope
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 ...
- Sun Mar 24, 2024 9:15 am
- Forum: Equipment Discussions
- Topic: Lens recomendation for film reproduction
- Replies: 62
- Views: 1283
Re: Lens recomendation for film reproduction
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...
- Sat Mar 23, 2024 7:07 pm
- Forum: Equipment Discussions
- Topic: Lens recomendation for film reproduction
- Replies: 62
- Views: 1283
Re: Lens recomendation for film reproduction
I can read that as saying that the Nikkor 60 mm lens was set on infinity focus ("minimal extension"), in which case the results make perfect sense. After the clarification I respectfully disagree... that it makes perfect sense... I agree with your disagreement. I had casually assumed that "minimal ...
- Sat Mar 23, 2024 4:56 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Lacking feature in Zerene and Helicon (but present in Affinity)
- Replies: 2
- Views: 180
Re: Lacking feature in Zerene and Helicon (but present in Affinity)
I would like to ask Rik: how complicated can it be to implement something similar in Zerene? I suppose, that what is needed is to detect the "bad/blurry" areas in DMAP and automatically replace them with PMAX, maybe on the fly, having PMAX already done before DMAP. But maybe this detection is alrea...
- Sat Mar 23, 2024 4:29 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Problem. "Fake rotation" of the object, with my Mitutoyo10x
- Replies: 12
- Views: 5666
Re: Problem. "Fake rotation" of the object, with my Mitutoyo10x
Thank you for the feedback.
I will be interested to read the new topic so that I can see what difficulties you are running into with stitching.
--Rik
I will be interested to read the new topic so that I can see what difficulties you are running into with stitching.
--Rik
- Sat Mar 23, 2024 4:11 pm
- Forum: General Discussion Forum and Community Announcements
- Topic: Loss of Robert OToole
- Replies: 29
- Views: 865
Re: Loss of Robert OToole
I thought I was prepared for this since Robert's earlier problems.
But it hits harder than I expected.
A remarkable man. I will miss him a lot.
--Rik
But it hits harder than I expected.
A remarkable man. I will miss him a lot.
--Rik
- Sat Mar 23, 2024 3:51 pm
- Forum: General Discussion Forum and Community Announcements
- Topic: Zeapon Motorized Micro 2Plus
- Replies: 1
- Views: 78
Re: Zeapon Motorized Micro 2Plus
Nothing in the ad looks very good for macro. They do not give any indication of step size, and the drive mechanism appears to be direct pull on a toothed belt. This device appears to be intended for use as a video/animation slider; note that all the illustrations show the camera either pointing off ...
- Fri Mar 22, 2024 2:12 pm
- Forum: Equipment Discussions
- Topic: Lens recomendation for film reproduction
- Replies: 62
- Views: 1283
Re: Lens recomendation for film reproduction
60 mm Nikkor with PB-4 bellows; Nikon_60MM_BellowsPB-4.jpg 60 mm Nikkor without Bellows; Nikon_60MM.jpg Only difference is ~ 500 microns short with Bellows vs. Macro lens mounted to camera, very close to 1:1 mag. Nikon Z6II flange to sensor is 16.00 mm vs. on Nikon DSLR (D850) is 46.5mm..... Really...
- Thu Mar 21, 2024 8:11 pm
- Forum: Equipment Discussions
- Topic: State of high CRI COB lights in 2024? Current recs?
- Replies: 4
- Views: 254
Re: State of high CRI COB lights in 2024? Current recs?
One drawback of LEDs that I have been noticing is banding at high shutter speeds (1/500 and faster). Yeah, that's something I'm definitely curious to find out about. Heck, even if 1/500s is fast enough to get a non-shaky exposure given my system stability (or instability), or if I run into banding ...