vop
Well-known member
I have read that the Opticron ES 80 GA has BK-7 prisms. Is that also true for the HR 80 GA ED, and other scopes at the "not-so-expensive" side of the scale? Have also seen much cheaper ones that boasts BaK-4 prisms...
I also have understood that BaK-4 prisms have a higher refraction index, and thus lets more light thru, but are more difficult=expensive to make.
So, is the kind of glass in the prism not the biggest issue in creating a bright and sharp picture?
I also have understood that BaK-4 prisms have a higher refraction index, and thus lets more light thru, but are more difficult=expensive to make.
So, is the kind of glass in the prism not the biggest issue in creating a bright and sharp picture?