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Message: <blockquote data-quote="denco@comcast.n" data-source="post: 1558550" data-attributes="member: 25300">Actually Kevin I would think the Zeiss FL would have better coatings than a Tasco Porro Prism but the the Tasco still had better light transmission than the Zeiss(That's kind of funny almost isn't it a Trashco transmitting more light than a Zeiss). The big difference is in the more efficient light transmission of the porro design not just the coatings. Porros have better beam transfer than roofs. When a $200.00 porro transmits more light than a $2000.00 roof it has to be in the intrinsic design not the quality of the coatings or materials. An internal focusing porro will transmit more light than an internal focusing roof also. It is in the design!Dennis</blockquote>