This moth fly appeared in one of my bathroom sinks. It's still winter here, even snowed a couple of days ago, but I suppose this thing grew up someplace in the plumbing system and didn't know or care about the weather outdoors. Anyway, I trapped it in a tiny glass cage made of cover slips, put a dif...

Thanks for the kudos! I showed your pictures in my fotoclub (on a beamer) but sadly most of the people did not get a stereo view. Have you ever tried to present your 3D work with something like the Loreo Stereo Viewer . And if yes could you share your experience on how to get the prints done? When I...

More outstanding photographs! The stereos of the mouthparts are a treat and really rock! And you have even managed to capture the "eyelet" in a living specimen! I wonder why the picture of the petiolus in my key doesn't show it, and neither is it mentioned in the text. Thanks! The feature is not di...

Several posts above ( HERE ), I showed a stereo view of the whole head of an ant. While talking with a friend on Zoom recently, we were exploring the images at higher resolution and noticed that the eye was confusing even in stereo. Here is that view: https://janrik.net/MiscSubj/2024/KitchenAnt_2024...

Those look great to my eye -- nice work!

Thanks for letting us know.

--Rik

P.S.: an interesting video about the 20/0.75 and the effect of coverslips is shown here (from minute 19) https://www.youtube.com/watch?v=n_dUgWDrYPw&ab_channel=HuygensOptics That's an excellent link, thanks. It is especially helpful for touching on the non-standard 20X NA 0.75's that are corrected ...

RobertOToole wrote: ↑

Fri Feb 16, 2024 9:33 am

I do have a link someplace where an optical engineer takes apart a D3, D300 and Canon 1DX and dissembles the AF arrays and sensors and how they work.
...
I did save the link if you are interested.

Yes please, definitely interested.

--Rik

Pretty sure all Canon and Nikon AF systems stop down a bit to f/8 or so to AF and don't focus wide open. I tested just now, shining a flashlight down the barrel to watch the innards of Canon EF Macro 100mm f/2.8 L IS USM mounted on Canon R7 body with EF-EOS R adapter, manual mode set on f/11. It au...

Adding to Chris's excellent information...

Lenses at 1:1 often have some uncorrected spherical aberration that causes focus to shift when the lens is stopped down.

If you focus with aperture open, this can affect manual focusing as well as automatic.

--Rik

If the individual images look OK, and you're using Zerene Stacker, then check your settings at Options > Preferences > Alignment.

I've heard that it has trouble trying to align DIC images.

Best is to turn off everything, assuming that your microscope stage is behaving well.

--Rik

Last question, in the images of the ideal light path, do I consider the "circle" side as the diameter of the objective rear lens element? I think that's correct, but I'm not positive, as this could be a different physical distance to sensor than the 150mm/200mm flange distance depending on the obje...

ray_parkhurst wrote: ↑

Wed Feb 14, 2024 5:34 pm

The tube with optics is 27.9mm diameter. Does that give a clue as to what these might attach to?

That does not ring any bells I have access to.

--Rik

I figured you may have been referencing separate diffusers, but I thought hey, it's plastic so let's try. Ha, so much for that. Heh, sometimes good advice goes awry in interesting ways! The LED tubes that I have are made of clear glass with a plastic diffuser wrapped tightly around the glass but no...

mkbn wrote: ↑

Wed Feb 14, 2024 12:32 pm

Agh, I didn't realize someone posted a thread about this already, sorry for a duplicate!

No problem. I just now pointed the other thread here, so they are cross-referenced.

--Rik

For another thread about this lens, see viewtopic.php?f=25&t=46970 .

--Rik