Seriously, I need to find some reasonable material that's actually available or else get surgery. Chromatic aberration = constant UHG.
-
-
-
Or else I'll just put a narrow band yellow filter on them & live in monochrome.
End of conversation
New conversation -
-
-
1) fragile? 2) I bet milling it to size is going to be a real pain at an ophtalmologist's shop
-
1) Um. You've worked with synthetic sapphire before, right? http://www.mt-berlin.com/frames_cryst/descriptions/sapphire.htm … vs http://www.mt-berlin.com/frames_cryst/descriptions/quartz%20.htm …
-
You're looking at Mohs hardness 9.0, Young's/Bulk/Shear moduli 345/240/145 (all GPa), 400MPa tensile strength. No glass is that strong.
-
Ironically this makes your 2nd point much stronger, since I imagine actually milling/cutting/making adjustments to Sapphire is much harder.
-
But honestly I think the main reason is even simpler: cost. Glass is cheap as hell.
-
Glass lenses are actually rather expensive compared to CR39 which is almost as good (within 1.0 Abbe value diff) & better at blocking UV.
-
But people pay big $ for the awful polycarbonate, etc. lenses all the time, with *awful* chromatic aberration. I'd pay 5x that for sapphire.
-
wait, PC is awful? I like how indestructible it is, and it lets me use nearly nonexistently thin frames
- 1 more reply
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.