Dear All,
I am going to be experimenting with some Germanium lenses for my thermal cameras. I used to use a free online program based optical test bench to simulate the beam behaviour of a lens, or multiple lens set. That software has disappeared
![Sad :(](https://www.eevblog.com/forum/Smileys/default/xsad.gif.pagespeed.ic.L3FGyzQrjB.png)
Does anyone have recommendations for a simple free optical test bench simulator that I can use in my hobby experiments please ?
I have googled for recommendations but many such simulators are either very expensive or overly complex for hobbyist use. Personal experience is often helpful in finding a nice, well designed hobby level program
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
I am used to such programs not containing support for Germanium lens elements with their high refractive index and compensate for that in my plots.
Thanks in advance
Fraser