Search found 18144 matches
- Sun Apr 11, 2021 8:35 am
- Forum: Equipment Discussions
- Topic: How Stupid Can Someone be? How about you?
- Replies: 18
- Views: 331
Re: How Stupid Can Someone be? How about you?
recommends to get the PCR Covid test in a week after the 2nd shot and it should show positive. I suspect some scrambling in the communication. Everything I read says that Moderna is an mRNA vaccine. It stimulates antibody production so it will likely produce a positive antibody test, just like a pr...
- Fri Apr 09, 2021 11:23 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Photomicrography demonstration on Zoom, 13th April 2021
- Replies: 2
- Views: 166
Re: Photomicrography demonstration on Zoom, 13th April 2021
Sounds interesting!
I'm glad to see that this will be available later as a recording, for those of us who are in radically different time zones.
--Rik
I'm glad to see that this will be available later as a recording, for those of us who are in radically different time zones.
--Rik
- Thu Apr 08, 2021 8:59 am
- Forum: Equipment Discussions
- Topic: Zerene Stacker performance on ARM macs?
- Replies: 3
- Views: 68
Re: Zerene Stacker performance on ARM macs?
Rashkh, welcome to photomacrography.net. I'm the fellow who wrote Zerene Stacker, and I answer all the support requests that come in by email. Here is what I recently wrote to another fellow: >Any comments on the Apple M1 for this sort of work? Is it much faster? It's a great chip, but important to ...
- Wed Apr 07, 2021 7:50 pm
- Forum: Equipment Discussions
- Topic: A7r4 pixel shift. Rather a resolution eye-opener
- Replies: 17
- Views: 331
Re: A7r4 pixel shift. Rather a resolution eye-opener
Here is an article on the topic by Jim Kasson. https://blog.kasson.com/the-last-word/does-pixel-shift-increase-resolution/ Unfortunately the body of that article has one significant flaw, and the subsequent discussion in comments is beyond my patience to try untangling. As I read it, the analysis s...
- Wed Apr 07, 2021 4:46 pm
- Forum: Beginners Macro
- Topic: Abbreviations for equipment and technicues
- Replies: 8
- Views: 137
Re: Abbreviations for eqiuppment and technicues
Rik, now that you mention it. I have the impression that Google lost track of a lot of the information on this site a while ago, maybe when the forum software was updated? There's been several times that I've tried to search for things that I know exists on this forum, but failed to find them using...
- Wed Apr 07, 2021 11:30 am
- Forum: Beginners Macro
- Topic: Abbreviations for equipment and technicues
- Replies: 8
- Views: 137
Re: Abbreviations for eqiuppment and technicues
Is there any abbreviation table or rules for describing the shooting technique? How can I correctly describe my photo in the gallery? There is no table. The main "rule" is only to try communicating accurately, completely, and concisely. Of course those three things conflict with each other, so some...
- Wed Apr 07, 2021 10:14 am
- Forum: Photography Through the Microscope
- Topic: Conjugating Mougeotia viridis - filamentous algae
- Replies: 5
- Views: 131
Re: Conjugating Mougeotia viridis - filamentous algae
Very nicely found, photographed, and explained -- thanks!
--Rik
--Rik
- Tue Apr 06, 2021 6:35 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Hairy areas Zerene stacking problem
- Replies: 8
- Views: 203
Re: Hairy areas Zerene stackig problem
Thank you for the new images. Yes, I agree it is the same effect -- alignment being messed up by changing pattern of illumination. Have you ever encountered such instability in lighting? Yes, it is a common problem. One of the examples in my "How To Use DMap" tutorial is a small moth, shot with Spee...
- Tue Apr 06, 2021 3:58 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Hairy areas Zerene stacking problem
- Replies: 8
- Views: 203
Re: Hairy areas Zerene stackig problem
Thank you for the sample images. In the Google Drive folder, I see files named 2A0A8279.tif through 2A0A8283.tif, which I will call 279 through 283. I wonder if these are the frames you intended to upload, because they do not show any of the eye in focus. However, they do have sharp detail in some o...
- Tue Apr 06, 2021 9:02 am
- Forum: Equipment Discussions
- Topic: Focus stacking by moving only the camera (not the lens)?
- Replies: 12
- Views: 368
Re: Focus stacking by moving only the camera (not the lens)?
have yet to think of a simple way to find the nodal point The "nodal point" that you're talking about is actually the center of the entrance pupil, the so-called "no-parallax point" for panorama stitching. This is also the viewpoint = center of projection for normal perspective. The best way I know...
- Mon Apr 05, 2021 10:24 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Hairy areas Zerene stacking problem
- Replies: 8
- Views: 203
Re: Hairy areas Zerene stackig problem
I checked the source images are fine, no distortion on the eyes. Thank you for the kind words. I am not on social media very much, so it's good to hear that I am well thought of. Now, about your stack... Because the source images are fine, and the pattern looks like it could be on a depth contour, ...
- Mon Apr 05, 2021 8:31 am
- Forum: Equipment Discussions
- Topic: Focus stacking by moving only the camera (not the lens)?
- Replies: 12
- Views: 368
Re: Focus stacking by moving only the camera (not the lens)?
or is this a thing? Can someone point me at a doc or discussion? It's definitely a thing. See discussion at https://zerenesystems.com/cms/stacker/docs/troubleshooting/ringversusrail . The key point is that focusing by moving only the camera guarantees that there is no change of viewpoint (center of...
- Mon Apr 05, 2021 8:17 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Hairy areas Zerene stacking problem
- Replies: 8
- Views: 203
Re: Hairy areas Zerene stacking problem
For Zerene Stacker, a good place to start is with documentation on the main Tutorials index page, at https://zerenesystems.com/cms/stacker/docs/tutorials/tutorialsindex . I always recommend to study at least the first 7 bullet points, down to and including "Tips for Retouching", including the two vi...
- Sat Apr 03, 2021 9:42 am
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: Purslane (Portulaca oleracea) seeds
- Replies: 19
- Views: 1417
Re: Purslane (Portulaca oleracea) seeds
If you want I can send you some seeds, if you give me your postal address. PM sent. Could it be very diffuse light allowing the interference to show through a thin top layer? I get the same thing with black beetles. If you diffuse the light enough (a lot - beyond ridiculous) then sub-surface patter...
- Fri Apr 02, 2021 10:39 pm
- Forum: Beginners Macro
- Topic: meta equipment choices in 2021
- Replies: 20
- Views: 490
Re: meta equipment choices in 2021
The equations help a lot in understanding this - I was reading about nyquist sampling last night but didn't know where to go from there I should have linked to my source: https://www.photomacrography.net/forum/viewtopic.php?p=124831#124831 . But of course there is more background. The formulas that...