Re: BAK 6 prisms ??


Barkley T Dog wrote:
> I have noticed binoculars being advertised with the 'latest BAK 6
prisms'.
> I've heard that BAK 4 are the best and BAK 7 are the most common, but
has
> anyone heard of BAK 6 and know if they are of good quality?
>
> They seem to be of chinese manufacture, and i'm wondering if they are
a
> cheaper make of BAK 4's. (or is that wishful thinking)


The only BAK6 I know of is made by Xinhu in China. It is equivalent to
Schott SK11, which has similar refractive index but lower dispersion
than Schott BAK4.

Brian
www.caldwellphotographic.com

.