- Oct 16, 2008
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How good is the quality of True Vintage Revival?
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TVR just released the 505.A question: I am seeking the perfect pair of pantos. Specifically, I want a fairly full, nearly perfectly round glass as opposed to the flattened version you find in most contemporary pantos. See, for comparison, one of Truman's glasses.
Most models I have found either have too great a difference between width and height of lens or mess up the shape somehow (too square). Savile Row seems promising though isn't exactly what I am looking for. Does anyone know of alternatives? Surely it cannot be too difficult to find a good pair of wire frames.
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Base curve. i.e. the front surface power.What does "base 2" means when you read a lens description (e.g., CR39 base 2)?
In short, CR39 has better optical quality, Polyamide trades off optical quality for being essentially indestructible.What are the trade-offs between polyamide and CR-39 lenses? I'm looking at sending a pair of JMM frames out to fit different lenses, and one of the 3 online services I've found uses polyamide (they're also in Australia, so that's a consideration)...
You can still make a plano lens with a base curve, you’d just pick a rear lens power that neutralizes the front. It would be *approximately* -2.00, but depends on lens thickness and material, as well as frame type and size. Ex: if you had a base curve of 2 in a 3mm thick CR-39 lens, you’d have a back surface power of -2/(1-(.003)*2/(1.498) = -2.01 diopters.
It’s only relevant in this case if you have a high prescription — if they only offer one base curve, it means with higher prescriptions they won’t be able to pick a different one to compensate for aberrations.I understand what you tell me. I just wonder why sunglass makers would advertise base 2, base 4 on their models. See for example:
https://www.lunetteriegenerale.com/collections/sun/products/architect (base 2)
https://www.lunetteriegenerale.com/collections/sun/products/cognac-1 (base 4)
It doesn't seem that it's very relevant info...