Well, I dropped one from waist height onto a bare concrete floor. I think it is de-centered now, but still produces pretty good images overall. The problem I saw with most of the bad lenses was "delam". I don't know if this happens when a lens is allowed to "fall or drop" but it's definitely bad ne...

I purchased several Mittys, 5x, 10x, 20x, 50x, and every one of them had issues. The only good ones I've purchased were brand new. Not sure how much of a shock is required to damage them though. Some looked fine by inspection, but produced a poor image. Others had delam. I don't think the delam is d...

Looks like a nice microscope Z-stage, and decent XY-stage as well, and you get the objective as well! You'll need to research to find the manual as it is discontinued, but appears to be a 10:1 zoom lens with a high quality objective. Great score for $81+shipping.

Alan Wood wrote: ↑

Wed Apr 10, 2024 11:14 am

https://www.ebay.com/itm/173375345447

Alan Wood

Thanks Alan! This one looks good at 75mm diameter. I'll see if I can find it from a US seller.

Ray

Igor wrote: ↑

Wed Apr 10, 2024 10:17 am

ray_parkhurst wrote: ↑

Wed Apr 10, 2024 7:55 am

But I can't tell how large the illuminated are is.

Dimensions:
2024-04-10_20-15-48.png

Thank you! I ordered one to try.

Has anyone seen a small backlit stage? Round is preferable, perhaps 100mm diameter. See if this might suit your purposes: https://aliexpress.ru/item/1005006132420668.html?sku_id=12000035904315191&spm=a2g2w.productlist.search_results.3.1a653f428LGVJP Looks very good! But I can't tell how large the i...

Has anyone seen a small backlit stage? Round is preferable, perhaps 100mm diameter.

Edited to add: I picked up a 6.5" round LED light from Amazon to try it out.

I did a lot of this kind of work in my last job at a MEMS startup (Cavendish Kinetics, now owned by Qorvo). Quality was one of the many hats I wore at that company. Most of the work was looking at failure analysis of the packaging, but occasionally I did some actual MEMS xsections, and I did some sl...

Thank you! OK...camera and stage on one platform... make sense... Red = Sorbothane pads Will adding second layer of such pads further reduce the vibration? I see they have different "hardness-softness"/Durometer or whatever it is called and different diameters... so a lot of combinations are possib...

Question is: will use of Sorbothane pads 2 times - once under the big board (lets say about 60-80 pounds total) and second time under the rail/stages (lets say 30-40 pounds) and head/camera (another 5-20 pounds) help with vibrations? If the red squares in your drawing are all sorbothane pads, then ...

Great selection Rik. This immortalizes Robert's method and skills and is a great posthumous honor to him. He was one of the first to go all-in to use semiconductor wafers with fine-pitch lithography for comprehensive, qualitative lens testing, and used it with good results to distinguish between goo...

Excellent! Looks like you got a good copy of this lens. If you sell it, let me know.

bbobby wrote: ↑

Fri Mar 29, 2024 1:47 pm

In the next few hrs I will get some picture with this lens to see the performance and if someone is interested I could post a few.

I'd be very interested to see your test images.

Hmm, an extension ring will cause a similar problem as bellows, except for the lack of flexibility. If you want more magnification, I'd recommend using a 1.4x teleconverter. It will allow your lens to work as it should in terms of focal length and close range correction, while giving you a magnifica...

As I said above, I don't understand the desire to insert a bellows. Dedicated macro lenses are not intended to be used with bellows. They do all sorts of weird things like changing focal length, adjusting lens positions for optimum performance, etc, and none of these things will work correctly with ...