Search found 4524 matches

by Lou Jost
Wed Sep 02, 2020 8:27 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 640

Re: Large format macro tests

Yes, though not stacked, both are single shots.
by Lou Jost
Wed Sep 02, 2020 6:03 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 640

Re: Large format macro tests

I should add that a similar cpomparison at medium format shows that a medium-format image without pixel-shifting is only slightly better (in terms of resolution) than a 35mm image of the same FOV with 8-image pixel shifting.
by Lou Jost
Wed Sep 02, 2020 5:58 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 640

Re: Large format macro tests

No. I'm comparing equal fields of view in single optical images. In one case, the optical image is 5 inches across, made by a large format lens, and in the other case, the same field of view is contained in an optical image 36mm across made with a modern macro lens designed for small sensors. The im...
by Lou Jost
Tue Sep 01, 2020 7:33 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Large format macro tests
Replies: 35
Views: 640

Large format macro tests

I used to do large format semi-macro photography in the old days of film, and I loved it. I lost all of that equipment years ago. But nowadays all the equipment I used to dream about back then is dirt cheap on eBay, since no one wants it. I've accumulated a Horseman 4"x5" view camera, numerous adapt...
by Lou Jost
Tue Sep 01, 2020 7:57 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Eastern Tiger Swallowtail
Replies: 3
Views: 266

Re: Eastern Tiger Swallowtail

Are the eye patterns perhaps a drying artifact?
by Lou Jost
Sat Aug 29, 2020 11:14 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Nikon 10x halos.
Replies: 8
Views: 336

Re: Nikon 10x halos.

I'm not sure I understand. Surely light leaks and loose threads could not cause the differences between these two pictures. One shows glare on the subject due to lack of diffusion. This could not be caused by light leaks. Maybe there was a source of reflected light near your subject in the bottom pi...
by Lou Jost
Sat Aug 29, 2020 5:39 am
Forum: Macro & Microscopy Articles
Topic: Blog on UV and other aspects of microscopy and imaging
Replies: 22
Views: 636

Re: Blog on UV and other aspects of microscopy and imaging

I think metamerism is a bigger problem with reflected light because the relationship between the objects' mix of colors depends on the light. A given magenta object can appear red or blue, according to the camera, depending on the light spectrum. With single-wavelength excitation, fluorescent object...
by Lou Jost
Fri Aug 28, 2020 8:44 pm
Forum: Macro & Microscopy Articles
Topic: Blog on UV and other aspects of microscopy and imaging
Replies: 22
Views: 636

Re: Blog on UV and other aspects of microscopy and imaging

Rik, thanks for your thoughts. I think that there ought to be less metamerism in fluorescent subjects than in pigmented objects under reflected light. The few emission spectra that I have seen are fairly broad, given a single excitation wavelength, and are fairly pure colors. I have yet to see gray ...
by Lou Jost
Fri Aug 28, 2020 12:50 pm
Forum: Macro & Microscopy Articles
Topic: Blog on UV and other aspects of microscopy and imaging
Replies: 22
Views: 636

Re: Blog on UV and other aspects of microscopy and imaging

Rik, I am struggling to capture what I see when doing fluorescence photography, and still struggling with how to think about it. Clearly the captured & redisplayed image cannot reproduce the spectrum of the fluorescence. Why do you say this? That would be my goal, to display the colors accurately, a...
by Lou Jost
Fri Aug 28, 2020 8:12 am
Forum: Equipment Discussions
Topic: Fuji in-camera focus stacking
Replies: 18
Views: 990

Re: Fuji in-camera focus stacking

I also don't find any problem using these controls. In Olympus cameras, people on this forum have conclusively shown that a step size of 2 is the best default, and in Olympus I just press the shutter once to start the process, and let it run until I see that everything of interest has been imaged. I...
by Lou Jost
Fri Aug 28, 2020 8:00 am
Forum: Macro & Microscopy Articles
Topic: Blog on UV and other aspects of microscopy and imaging
Replies: 22
Views: 636

Re: Blog on UV and other aspects of microscopy and imaging

I'm curious if you have found problems getting all the fluroescence colors right in an image. It's clear that adjusting the colors by white balancing can't get all the colors correct, because the fluorescence colors are not produced by reflected light. In my photos, adjusting the color balance to ma...
by Lou Jost
Fri Aug 28, 2020 7:20 am
Forum: Macro & Microscopy Articles
Topic: Blog on UV and other aspects of microscopy and imaging
Replies: 22
Views: 636

Re: Blog on UV and other aspects of microscopy and imaging

A very interesting topic! May I make a suggestion? The x-axis of your graph doesn't have enough values marked, in particular no tick for 400nm, which is a critical number.
by Lou Jost
Thu Aug 27, 2020 2:10 pm
Forum: Photography Through the Microscope
Topic: Tic
Replies: 6
Views: 439

Re: Tic

Weirdly beautiful and a little frightening.
by Lou Jost
Thu Aug 27, 2020 12:39 pm
Forum: Equipment Discussions
Topic: 24MP "only" FF camera with Pixel-Shift
Replies: 12
Views: 499

Re: 24MP "only" FF camera with Pixel-Shift

Congratulations, and if I can help you with it, just let me know.
by Lou Jost
Thu Aug 27, 2020 10:57 am
Forum: Macro & Microscopy Articles
Topic: Blog on UV and other aspects of microscopy and imaging
Replies: 22
Views: 636

Re: Blog on UV and other aspects of microscopy and imaging

That will be much appreciated by many of us.