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On a related note, anyone wearing prescription glasses will be affected by chromatic aberration to some degree, which may notably cause the blue portion of the
by amluto 1mo ago
On a related note, anyone wearing prescription glasses will be affected by chromatic aberration to some degree, which may notably cause the blue portion of the image to be shifted relative to the rest of the image, which makes text and other detail harder to see and can be annoying. This effect is accentuated when looking at a strongly trichromatic source like a computer or screen because the spectrum is discontinuous and the blue content has more power at shorter wavelengths than most natural sources.
You can mitigate this by using lenses made from a material with a higher Abbe value. Polycarbonate is the worst, CR-58 is the best, and Trivex is quite good. Trivex is also impact resistant, so it’s an excellent alternative to polycarbonate. The high-index plastics are quite bad, so if you don’t need them, consider asking for mid-index or Trivex instead.
- lightedman 1mo ago"On a related note, anyone wearing prescription glasses will be affected by chromatic aberration to some degree" Fluorite lenses FTW. Practically zero aberration. CR-58 pales in comparison.
- amluto 1mo agoEww, that's awful. Calcium fluorite has a rather low IOR and is very dense. What you want is a sapphire lens, except that the birefringence might be problematic.
- lightedman 1mo agoThat birefringence in corundum is why fluorite is used. Fluorite lenses low index of refraction across all wavelengths is also the reason for lacking chromatic aberration. Fluorite lenses are generally superior. For macro photography there is literally no equivalent.
- amluto 1mo agoYou are welcome to wear a macro lens cantilevered out from the bayonet mount built into your face :) I would prefer a lightweight, or at least not outrageously thick and heavy, pair of glasses.
- johnwalkr 1mo agoI find it weird that in specific cases it's such a huge effect yet most of the time I can't notice it. Once when I got a new prescription I googled why the X in the red circle icon for closing a window is so off-centered, but it's just a case where chromatic aberration is really noticeable.