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Best lens for macro electronic components

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Zucca:
New candidate for my purchase, Laowa 90mm f/2.8 2x Ultra Macro APO which is RF compatible and has sort of IS in it, nice!

https://www.venuslens.net/product/laowa-90mm-f-2-8-2x-macro-apo/

https://dustinabbott.net/2022/06/laowa-90mm-f2-8-apo-2x-macro-review/

mawyatt:

--- Quote from: spostma on August 10, 2022, 07:46:52 pm ---
A superb macro lens that was used in 9600DPI dia scanners:
https://www.closeuphotography.com/minolta-dimage-scan-elite-5400-lens/

--- End quote ---

Yes indeed!! We have the Minolta DI-5400 lens from long ago before the craze started, also acquired long ago a Printing Nikkor PN105 F2.8A that was used to reproduce 35mm motion picture film from the master that was sent out to the theaters!! Another good one if you can find such is the Lomo 3.7X and Canon 35mm Bellows lens, some of the old lenses are really good from 1 to 5X, then the microscope infinity type from Mitutoyo take over.

Here's the PN105 on a custom machined lens fixture attached to a Nikon D800E (also gets attached to a D850 or Z7), the fixtures mounted onto a custom THK Linear Rail for focus stacking. Everything is operated from custom controllers and such.

Best,

magic:

--- Quote from: alm on August 10, 2022, 06:16:39 pm ---
--- Quote from: mawyatt on August 10, 2022, 04:10:07 pm ---If cost is a concern look to the Raynox DCR-125 and 250 add on Lenses, these are very usefully and work well, and should do a decent job with your Canon 20-70mm.

--- End quote ---
Will they mount on the 20-70 (24-70?)'s large filter threads?

--- End quote ---
Mechanically, you need a step-down ring to 43mm filter thread, that should be doable. Don't use the included universal adapter even if it fits, it's weak plastic junk prone to breaking and dropping the Raynox on whatever you are photographing.

Optically, cut a 35mm hole in a piece of paper (actual diameter measured on actual lenses, I own both of them), hold in front of the lens, see if it vignettes. At the wide end it surely will.

mawyatt:
Here's a small example of some of the focus stacking equipment developed over the years, and some of the necessary lightning strobes. These strobes were positioned by the "C Stands" to get the proper lighting, which at higher magnifications requires massive amounts of light. The focus stacking fixtures are for vertical and horizontal use, and some have X, Y,  & Z for Stack and Stitch efforts, automated controllers based upon the Trinamic Devices were developed for stacking and S&S efforts.

This is the kind of effort required when your imaging chips that get blown up very large, sometimes covering a large wall. We started these efforts back in 2000 using the usual shooting thru a microscope, but soon realized the limitations and decided to develop our own lens, fixtures and controllers. Quite an undertaking back then and evolved into these type of fixtures and setups.

One very difficult obstacle that showed up was flip chip solder balls. When these are new and not oxidized, the surface is like a tiny 40~100um polished spherical mirror that reflects everything from everywhere!! Another was the perspective change when stacking and especially when S&S when you are trying to line up 19 tiles, each tile stacked with 300~400 individual image (yes 6,000~8,000 images) to render a final image of 30,000 by 25,000 pixels!! Because chips have precise features that must line up perfectly when stacking and especially when stitching, this calls for a different type lens design called "Telecentric", where the apparent magnification doesn't depend on distance to subject. This is just scratching the surface tho, lots of interesting challenges encountered!!

Anyway, fun stuff indeed!!

Best,

mawyatt:
Couple more images of the focus stacking setup rails.

Best,

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