I am thinking about buying a Sony E mount lens to use reversed on my other lenses. This would only work if the aperture stays open when the lens is off the camera. Can a Sony user tell me if that is how the E-mount lenses behave?

Thanks in advance!

To answer the question about mirrorless cameras, there is no delay. For low m (say, up to 2x or maybe 3x), you can stack by moving the focus ring instead of by rail, and take a hundred or more shots per minute. There are costs though. You'd have to use continuous light to achieve that speed (unless ...

That's what I thought.

Very nice. Are there new monitors that display the full ProPhoto gamut?

That's a problem I wish we all had more often--a diamond too big for our diffusers!

The light comes from below, and iPhones capture the images and videos quite nicely. I was introduced to them by Stanford students I was guiding this month; we were able to look at and record videos of microorganisms like rotifers while we were in the jungle, no need for a lab. They gave away thirty ...

I know Rik said he's interested in opaque subjects but in case someone comes to this thread with an interest in transparent ones, they can try the 'Foldscope", a 10x or 100x (depending on lens choice) origami device with a tiny bead lens which is optically decent and very very cheap (like <$1.00). S...

That's a very nice video you've made; makes the point very clearly.

It was interesting to read about the two main kinds of CA: magnification differences between colors, and focal plane differences between colors. Now I know why one of the Photoshop defringing tools changes the size of the image as you use it.

You could make such a lens by coupling two lenses front-to-front with a paper stop sandwiched between them, and focusing the rear lens. Might work for very shallow stacks.

It seems to be red/green, which I normally see from LoCA.

Success!!! Than you Rik!

Thanks very much Jorgen for the encouraging information. I'm very excited to have found this objective on eBay; your thread here was decisive for me. I work with alcohol-preserved orchid specimens that must be photographed submerged. I can change the alcohol to water for a short time.

I just ordered one of these objectives for my work. How do you manage to move the lens without ttransmitting vibrations through the water to the subject? I would imagine delicate plant hairs would move each time you stepped the rail, as the lens made little pressure waves in the water.

Yes, that bothered me too. But the resemblance was unmistakable and it definitely was not imitating bird poop like its relatives.