Random optics stuff

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CodeHD
Posts: 182
Joined: Tue Dec 11, 2018 12:38 pm

Random optics stuff

Post by CodeHD » Mon Jul 08, 2019 6:39 pm

Time to open a WIP collection for myself, to keep sharing more stuff I try...

Today I couldn't help but procrastinate :D , so I decided to test the boundaries of working with complex lens systems in LuxCore, and to try how easy the lens addon is to use.

So, I searched for an image of the design of some DSLR lens, put it in Blender as a background image and model the lenses on top in ortho view. I picked the Zeiss Otus 55mm lens, which has a total of 12 elements, or 24 specular surfaces. Then, as usual, the detector as a thin slab of matte translucent and an aperture at the front.
outs_setup2.PNG
outs_setup3.PNG
Of course, the refractive indices are just coarsely guessed, and I only assumed two glass types - which is probably wrong, as is the location of the aperture at the front of the lens.
outs_setup1.PNG
Finally, after a bit of fiddling around, I managed to get a nice result. The following was only 1 minute render time with Hybrid PathCPU:
EDIT: And that is even 1 minute on my notebook (i7-4800MQ)
otusrender.png

Fox
Posts: 307
Joined: Sat Mar 31, 2018 11:17 am

Re: Random optics stuff

Post by Fox » Mon Jul 08, 2019 9:50 pm

With no lens formula it's hard to get the lens in focus.
I played little with the Zeiss ZM 35mm 1.4 Distagon design, but the Meyer Optik Görlitz Trioplan looks interesting.
It's a 3 element lens with soap bubble bokeh like below:

Image
Image

Not a sharp lens, but got me wondering if it would be possible to render like that :roll:
https://www.youtube.com/watch?v=k51WiLr_kjk

:D The company went bankruptcy, many kickstarter backer lost the money, but it was sexy 3 element lens for $2000
https://youtu.be/tEAyYHvluog?t=44

CodeHD
Posts: 182
Joined: Tue Dec 11, 2018 12:38 pm

Re: Random optics stuff

Post by CodeHD » Tue Jul 09, 2019 3:35 pm

Fox wrote:
Mon Jul 08, 2019 9:50 pm
With no lens formula it's hard to get the lens in focus.
I played little with the Zeiss ZM 35mm 1.4 Distagon design, but the Meyer Optik Görlitz Trioplan looks interesting.
It's a 3 element lens with soap bubble bokeh like below:
Indeed, the exact curvatures are very important :)
Fortunately, you can find some designs online, e.g. on the wikipedia page for the Cooke Triplet, which seems to be the base design the Trioplan uses:

https://en.wikipedia.org/wiki/Cooke_triplet

The blend-file I uploaded earlier in the following thread uses this design:

viewtopic.php?f=4&t=1210

Unfortunately, that didn't show the soap bubble Bokeh, there must be some important detail about the lens curvatures to get it ;)

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