Re: Suche billige Einsteigerkamera...

Uwe Schröder wrote:

> > "XR" ...hmm... klingt kewl -
>
> Extra Refractive Index 'XR'
> * Glass having a refractive index of more than 1.69 is called
> ?extra refractive? or ?high index glass.?
> * The refractive index - its ability to bend light - plays a
> critical role in the creation of the power and thickness of an
> element. Extra Refractive Index (XR) glass ?bends? light more
> effectively than normal or lower refractive index glass and
> can therefore compensate for specific aberrations within an
> optical design.
>
> http://www.tamron.com/lenses/xr/xr_slide1_small.asp
>
> Wie hoch ist denn der Brechungsindex "normaler" optischer Gläser?

"Brechungsindizes einiger optischer Massenglaeser

BK7 1.518 K5 1.524
BaK4 1.571 SK16 1.623
SK 15 1.626 F2 1.624
SF2 1.652 SF10 1.734
SF6 1.813"

[nach G.Schroeder "Technische Optik"]

Brechungsindex 1.69 ist also hoch, aber noch nicht extrem. Diamant
hat uebrigens 2.4 :O)


Grusz,
Rainer
.

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