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Anonymous
>>203961 That is correct, even what came before the Tessar, the Cooke triplet, used 2 types of glass (read a bit on Crown and Flint type glass), one with a low RI and low dispersion (main type) and one with high RI and high dispersion. These are used together to correct for chromatic aberration in a +1-1 basis, depending on the materials' qualities of course. The point is they're used to cancel out color dispersion.
It is true that even the most simple lenses use more than one type of glass, which I do not have. Because of that, I already am aware that my lens will suffer from strong chromatic aberration. There will be no surprise there, but at least I can attempt to correct for spherical aberration, coma, and astigmatism.
I've already looked at a very possible alternative for a second type of transparent material which I can use in the same way as this, but I don't know all of the details about it yet, so for the time being, I'll have to make do with one and check out the results.
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