Hello everyone!
I'm thinking of making my own lens, as a hobby project. However I've struck a wall, since I can't find the equation for calculating the max aperture of a multiple element lens.
When using a single element, it's simple: focal length divided by diameter. For compound lenses though, the only instruction I can find is to measure the entrance pupil.
Now this presents a problem as I don't have the lenses to measure, and I want to build the lens to spec. instead of just putting things together and measure the end result.
For the curious, I'm looking to build a ~f2.8 ~180mm, no shutter, no aperture, probably 3d printed barrel for wide open portraits.
I hope this is intelligible, English is not my first language
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