A recent video (April 7, 2024) was recommended to me by YouTube: "This Invention Made Disney MILLIONS, but Then They LOST It!" The title is clickbait, but the content is very interesting anyway. What the video actually describes is a sort of "yellow screen" technique that is similar to green screen ...

Thanks for all your comments and questions. I apologize for my delay in responding! In doing some further investigation I ended up diving into a rabbit hole, which has been consuming most of my think time for the last week or so. I've often wondered whether it would be a good idea to coat specimens/...

lothman wrote: ↑

Tue Apr 16, 2024 8:20 am

0.05 mm per Revolution

Heh, what's an extra zero between friends?

Yeah, that looks like a standard metric micrometer, 0.5 mm per turn, 10 microns per tick mark. But that's pretty good up through 5X, usable at 10X.

I have written to AstrHori to confirm or correct.

--Rik

and uhhhh, I might have to necromance your old thread on the cystidia sub-linked in your fiber/springtail thread! (unless that's a huge no-no) Resurrecting old threads is OK as long as the new posting adds information or asks a relevant question, and does not look like it's being done with intent t...

It's a bit fiddly, but supporting the specimen on a bed of fibers can give some extra freedom for stable positioning. For an ancient example, see https://www.photomacrography.net/forum/viewtopic.php?p=2796#p2796 (and the surrounding thread). Edited to add: the stereo view at https://www.photomacrogr...

I have noticed a recent change in behavior of notifications from the forum. Nowadays I do not get a notification of new replies to a post I have responded to. Maybe some flag got cleared by me accidentally?? It's also possible that some conflict has developed between the email servers used by you a...

Björn, Regarding your PM, see FAQ: There's a PM stuck in my Outbox. What's wrong? Most likely Lou is just away from his computer for a while and will see your message when he gets back. As for focus bracketing, I have no experience with that exact lens but perhaps some general info will help. A good...

I think i solve the problem witch was the light control from the back. It seems that the HR is much more sensitivie for it. I spend couple days to have more controled light and below are results ... 10:1 HR by Radoslaw DIY , on Flickr Thanks for the update. I downloaded the maximum resolution image...

Well the stationary pixels or dust particles are always in the same spot so naturally they will produce an artificial "line" in space during stacking. With a rocking stereo the application basically assumes this "line" exists and will animate it like the rest. Just so, and well said! Also important...

PXL_20240408_185833738_crop.jpg Here in Washington State the solar eclipse was only partial, max coverage about 37%. I don't have any equipment suitable for pointing at the sun, but I do have some window shades with little holes that make pretty good pinhole cameras. Most of the time they just show...

Wich is yours? It is labeled only "aus JENA", but somehow I figured out that it's a Laboval 2. As of today, Google Image search for aus jena laboval 2 shows many images that look right. Oddly, the #2 hit is from my own website, where long ago I posted some notes about rehabbing the focus block. See...

The total displacement of 120mm (not 140mm as I wrote) that the rail travels is equivalent to six and a half turns of the buttons, which when divided gives 18.46. Isn't there anything missing here? I don't think that you (or Pau :wink:) have missed anything very important. But adding some details.....

Really nice set!

That scale shot at the end adds hugely to my pleasure in going back to study the closeup portrait.

--Rik

The above explanation is correct as far as it goes, but there may be another complicating factor. Sometimes the alignment process can be led astray by asymmetry in how the subject appears to change shape and size as it goes in and out of focus, with the result that the alignment process introduces "...

the depth on the stereo photo is quite large Well, it's easily seen. But in terms of Zerene Stacker's controlling value, stereo shift for the above image is only plus and minus 3.6%, barely larger than the default value of plus and minus 3.0%. If I had not told you that the shift percentage corresp...