I pulled this off of Chuck Hawk's website. What are your thoughts or opinions of this review? Is it true what he is saying about the Zeiss glass?
Perhaps no current scope maker is carving up the deluxe scope market like Zeiss and their "made in USA" Conquest line of scopes. People seem confused about them.
1) Neither Leupold nor anyone else makes scopes for Zeiss. Other scope manufacturers do buy uncoated glass from Zeiss for their own product. Zeiss coatings are proprietary, however. No coated scope lenses are sold.
2) Zeiss Conquest tubes are made in Long Island, NY, at Zeiss' own facility.
3) Zeiss power ranges are as stated.
4) The optics in Zeiss scopes are made by Zeiss, imported from Europe.
5) Zeiss conducts sporadic destructive recoil testing; however, it is a small percentage of their production. None of these scopes are sold; they are destroyed after testing.
6) Light transmission through Zeiss Conquest tubes is approx. 93%. Zeiss was quick to point out that what degrades image quality is the grade of glass. Lead and arsenic content is destructive to scope images; that is why Zeiss is quite proud of their lead-arsenic free glass. Production of optical glass requires analysis and variation of the refraction factor, etc., so that the best possible combination and compounding ratio can be selected. To eliminate the use of lead (lead oxide), it was discovered that titanium oxide compares well with lead. Titanium oxide does no harm to the human body; it also renders a high refraction factor and is chemically stable. A big plus for scope use is more lightweight lenses, as titanium oxide is very light.
The 93% light transmission seems a bit light compared to other claims. Zeiss explained that they don't measure "light transmission" like other manufacturers, they go "air to air" not "lens-to-lens." The lead-free arsenic-free glass allows for non-distorted light, which is allegedly more perceptible and usable by the human eye, along with their own coatings, which they feel are generations ahead of the many scope gluers.
Naturally, I also asked why they felt they were "ahead?" The answer was, as they actually make their own glass (Schott), they should know a little bit more about it than people who just buy it.