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For a given lens strength (prescription), the material with the highest Abbe number will have the fewest chromatic aberrations. Is that not correct, and the who
by frosted-flakes 5y ago
For a given lens strength (prescription), the material with the highest Abbe number will have the fewest chromatic aberrations. Is that not correct, and the whole point of the Abbe number?
Some higher-index materials have noticeably worse Abbe numbers than others, and for my prescription of -9.75/-8.75 I selected a high-index 1.61 lens because it supposedly had an Abbe number of 41 whereas the higher index (and thinner) 1.67 or 1.74 lenses have much worse Abbe numbers of 32 and 33. Sure, the lenses are thick, but that doesn't bother me, and neither do chromatic aberrations much anymore.
Also, smaller lenses may reduce chromatic aberrations, but only because they reduce the field of view. I would rather have clear side vision with some aberrations than have very blurry side vision.
- alar44 5y agoYes that's the point of an Abbe value but if your lenses are super thin you can't tell. Chromatic abberation becomes more apparent as the lens thickness increases. Glass has the lowest but it's irrelevant if you're making glass an inch thick for example. No matter what you use, you'll have very noticeable abberation. The tradeoff for a thicker lens using 1.53 vs 1.74 will never be worth it as you'll be wearing coke bottles and you'll still see abberation because it's so damn thick.
- deleted 5y ago[deleted]