Electronics > Projects, Designs, and Technical Stuff
DIY Focus Stacking for Macro Photography
mawyatt:
A few answers to some questions.
1) Generally in-camera focus stacking doesn't work well when the magnification goes beyond ~ 2X, it's better to move the camera/lens and/or subject. Perspective issues become a problem. Check out PM for more details.
2) Often special lens are used in stacking other than the standard camera "macro lens". Reversed lenses, stacked lenses, inspection lenses, microscope lenses, reproduction lenses, and bellows lenses for example. See PM for more details.
3) Special telecentric lenses, or near telecentric, are often used for serious Stack and Stitch (S&S) work. S&S is like a macro panaorama where multiple focus stacks are stitched together to render a much larger image. We've done 29000 by 23000 pixels chip images, and soon much larger!!
4) Lighting becomes more difficult as the magnification increases. Many use flash/strobes to help with vibration issues. Highly diffused light is generally required, many times with multiple layers of diffusion.
Anyway, lots of things to deal with, the mentioned PM site is devoted to macro imaging and a great resource.
https://www.photomacrography.net/index.htm
Here's a very low res (original is ~40MB JPEG) chip image example. It's a Direct Digital to Antenna (DD2A) chip (patent 7903016) from long ago, process was IBM Silicon Germanium 9HP 90nm BiCMOS.
Best,
schmitt trigger:
I am also subscribing to interesting thread.
The images are beyond awesome.
DrG:
--- Quote from: mawyatt on July 01, 2020, 06:24:08 pm ---A few answers to some questions.
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Best,
--- End quote ---
Yeah, I have been doing some due diligence and reading on the wide range of the subject matter. It is intriguing.
I also went to the site and looked around and read the posting policies and so on. Thanks for making me aware of it.
I don't have the equipment to do it properly right now but it is on my radar. I may try an attempt with what I have. Believe it or not, one consideration is all the other projects ongoing and on the list.
mawyatt:
--- Quote from: schmitt trigger on July 01, 2020, 06:35:41 pm ---I am also subscribing to interesting thread.
The images are beyond awesome.
--- End quote ---
Thanks.
I'll post more low resolution images and details if you and others want (many images I can't show though). Don't want to take up space unless folks are interested.
The history behind all this started way back in ~2003, when we wanted to get images of the chips we designed but wanted something other than the usual microscope type chip image.
Best,
RoGeorge:
Yes, of course, please post more pics!
Also, in general there is a lack of information about how a certain transistor, stage or other schematic structure looks like in silicon (e.g. people asking to read a die photo similar with reading a schematic: https://www.eevblog.com/forum/projects/die-shot-features-help/ ), so any other explanations or annotations will be appreciated.
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