Does anyone know what the hold up is on the 1.74 high index?
Does anyone know what the hold up is on the 1.74 high index?
I think it is ignorance ;)
I heard that it was because of a lawsuit over patent rights. Wish they would hurry up and get it settled.
Another possibility is impact resistance with thin centers/AR.
Robert
I originally heard it was the noxious smell created when surfaced... so the fda wouldnt approve it... not sure if that was true though
Oh yeah, it reeks bad!!!
Smells like ONIONS that were already ingested and released back into the atmosphere.
Actually, I think For-Life was right when he said ignorance.
Don't know about 174 but both 166 & 167 smell like cureing Epoxy when edged or ground. I suspect they are Epoxy.
We've used quite a few pairs over the last year or so, it's available here as a stock finished lens. Very nice, very thin, it stinks when edging and one other point....... I don't see much difference between 1.74 and 1.71
apart from the cost.
I suppose the answer is to make up 2 lenses with the identical Rx and check them out
The only way to see a marked difference is with really high Rx's. I see people dispensing 1.67 lenses in Rx's under -2.00. I'm thinking that's taking advantage of someones lack of knowledge to make a buck:) . Just a thought.Originally Posted by Clive Noble
shutterbug
I have done that only because it was offered to my by my lab as a promotion at half price. Half price of a pair of Panamics 1.67 D Alize is much cheaper than Panamic 1.5 D Alize. It was also nice to give my customer a price break.
From what I have done I cannot see using a 1.74 unless the rx is higher than -11.00 is an average size frame with an average pd.
we should start a new thread!!! "name that smell".............i think 1.7 smells like rotten pastrami :bbg: it's fun to watch the outside vendors expressions when they ask "what's that smell?" and with a deadpan look you reply."what smell?" ;)
1.74 has the smell of success
I think it will sell good in the US, if we can ever get it.
Get it from the Chinese. The plastic is Japanese.
Supposedly it can't be imported to the US. I've tried getting it through ther Chinese and Koreans and no one will send it to me.
I get e-mail from the Chinese optical manufacturers mostly every week promoting their products, even in small quantities. Will post some of them next I get some.
I've had problems getting the really high index materials in really high Rxs. I recall a -14.00 -4.50 / +2.25 that was unavailable from Hoya in the 1.71 or 1.71 Wide. And forget aphakic lenses. +12.00? Sorry, CR-39 only. +4.00 with 16 prism diopters base out in each eye? Sorry, we need extra thick blanks - made of CR-39, of course! So, when you really, really need a thin lens - forget it!:hammer: :angry:
Nikon stops making their 1.74 after 15 diopters. It is ridiculous, you can bet that they have it available in a -3.00, but not a -16.00 when it is actually needed. I even see companies offer it in a single vision stock form for ranges Plano to -10.00.
I know it is supply and demand, but don't tell me someone is actually buying it in -3.00.
Yep I was stumped as well when I ordered this from Zeiss last week...
-18.00-1.50X010
-13.50-1.25X170
and they told me that I couldn't get the 1.74 because it was out of range
:hammer:
Had to settle for the 1.67 AS.
:angry:
you can get 1.70 up to -18.00 TOTAL power
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