Search found 18927 matches

by rjlittlefield
Wed May 25, 2022 11:32 am
Forum: Beginners Macro
Topic: Rail Focus or Lens Focus
Replies: 2
Views: 35

Re: Rail Focus or Lens Focus

For starters, see the article at https://zerenesystems.com/cms/stacker/docs/troubleshooting/ringversusrail .

Then feel free to discuss further here. I wrote that article, so I'll be happy to expand or clarify as needed.

--Rik
by rjlittlefield
Tue May 24, 2022 11:00 am
Forum: Equipment Exchange
Topic: FS:(europe) Mitutoyo plan apo 20x 0.42
Replies: 10
Views: 719

Re: FS:(europe) Mitutoyo plan apo 20x 0.42

I agree that people may see the plastic wrap as scratches. I certainly did.

But be aware, the link in your posting is broken so it leads only to an error page, not an explanation.

--Rik
by rjlittlefield
Sun May 22, 2022 10:27 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Scales on the wing of Urania leilus
Replies: 6
Views: 144

Re: Scales on the wing of Urania leilus

I use the mjkzz Qool rail with IR controller. I use a longer exposure (0.6-1s) and set the speedlichts to flash after 0.3s to eliminate vibration from the rear curtain. Ah, thanks. So then, the technique described at https://www.mjkzz.com/single-post/2018/05/08/flashes-continuous-lights-and-flash-t...
by rjlittlefield
Sun May 22, 2022 3:42 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Scales on the wing of Urania leilus
Replies: 6
Views: 144

Re: Scales on the wing of Urania leilus

Bart, welcome to image posting.* These images are very nice -- great light especially on the shiniest scales! I am puzzled, what does "mid curtain flash" mean? --Rik *(One minor niggle: the posting guidelines indicate a limit of 6 images per day in the image galleries. We do make exceptions to that ...
by rjlittlefield
Fri May 20, 2022 8:45 pm
Forum: Photography Through the Microscope
Topic: ID help for fugitive from Stentor Coeruleus
Replies: 3
Views: 141

Re: ID help for fugitive from Stentor Coeruleus

Nice video!

This is not my area of expertise, but I wonder if the fugitives are things that the Stentor sucked in, could not digest, and is now getting rid of.

See https://www.microbehunter.com/microscop ... 3&p=110469 .

I have no clue about ID on the fugitives.

--Rik
by rjlittlefield
Fri May 20, 2022 6:51 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: rare male of Encarsia formosa (parasitic wasp of whiteflies)
Replies: 0
Views: 117

rare male of Encarsia formosa (parasitic wasp of whiteflies)

In earlier posts ( HERE and HERE ), I have shown and talked about the whiteflies and parasitic wasps that took up residence on a basil plant in my kitchen. The wasps are Encarsia formosa , or something very much like them. These critters have a very lopsided distribution of genders in their populati...
by rjlittlefield
Fri May 20, 2022 5:09 pm
Forum: General Discussion Forum and Community Announcements
Topic: Andy Murray talks about photographing springtails in the field
Replies: 0
Views: 46

Andy Murray talks about photographing springtails in the field

Visit https://www.chaosofdelight.org/ and you will be instantly introduced to the world as photographed by Andy Murray, up close and personal with springtails going about their daily lives. Visit https://youtu.be/0DShg_4Hlkk?t=1 , and you can listen to Andy talk about why and how he shoots those pho...
by rjlittlefield
Fri May 20, 2022 4:24 pm
Forum: Equipment Discussions
Topic: lighting cage with CAMVATE clamps and arms
Replies: 5
Views: 415

Re: lighting cage with CAMVATE clamps and arms

Thanks for the interest and feedback. I hasten to point out that I have cribbed shamelessly off other people's ideas, particular those videos by Allan. The use of stiffer material for the cage is a good option to pursue. I will be very interested to see what you come up with, and I'm quite sure Alla...
by rjlittlefield
Fri May 20, 2022 10:04 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Arum maculatum
Replies: 9
Views: 210

Re: Arum maculatum

My Chrome browser does such text translations also. This happens automatically when the whole page is in foreign language. In the case here with veed.io, the translation in browser does not work because the voice-to-text German subtitles are encoded in some strange way that prevents the browser from...
by rjlittlefield
Thu May 19, 2022 7:47 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Hexamethyldisilazane (HMDS) -- a drying aid
Replies: 6
Views: 872

Re: Hexamethyldisilazane (HMDS) -- a drying aid

The previously mentioned flying aphids came out so badly that I never bothered photographing them. But more recently, I had another occasion to try drying with HMDS, this time with some small wasps. These are the parasites on whiteflies that I have posted about HERE and HERE . These subjects are tin...
by rjlittlefield
Thu May 19, 2022 6:45 pm
Forum: General Discussion Forum and Community Announcements
Topic: ptychographic X-ray laminography
Replies: 0
Views: 39

ptychographic X-ray laminography

The May 2022 issue of IEEE Spectrum describes an imaging technique that was new to me: "ptychographic X-ray laminography". The entire article appears to be publicly available: https://spectrum.ieee.org/chip-x-ray . Quick summary is that the authors are using a form of scanning X-ray diffraction, to ...
by rjlittlefield
Thu May 19, 2022 5:27 pm
Forum: Photography Through the Microscope
Topic: A Choanoflagellate and Lacrymaria
Replies: 3
Views: 182

Re: A Choanoflagellate and Lacrymaria

These are lovely!

--Rik
by rjlittlefield
Thu May 19, 2022 5:03 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Arum maculatum
Replies: 9
Views: 210

Re: Arum maculatum

Got it, thanks. There's a nice video at 1:50-2:00 of https://av.tib.eu/media/11548 . As an experiment, I downloaded the video, extracted the audio, and uploaded that to veed.io to generate subtitles from the audio. For the indicated section, veed.io gave: Die Antheren der männlichen Blüten platzen b...
by rjlittlefield
Thu May 19, 2022 11:55 am
Forum: Equipment Discussions
Topic: Edmund Optics article on Reflective Objectives
Replies: 21
Views: 316

Re: Edmund Optics article on Reflective Objectives

...specific spacing and diameter of the entrance hole... With the nosepiece it is much better as I remember. Mine did not have a nosepiece, but I experimented with adding a conical hood. That worked sort of OK in terms of controlling the stray light, but only when the hood extended so far from the ...
by rjlittlefield
Thu May 19, 2022 11:27 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: perspective on O-ring (images added)
Replies: 5
Views: 192

Re: perspective on O-ring (images added)

...you told that there are no burs or sharp corners. Is the a cross bore (without chamfers) where the O-Ring has to be pussed over? Those cutting lines would fit perfectly for that. Not quite right -- I said only that I found no burrs. I did not specifically check for sharp corners without burrs, b...