At the heart of the TSN-550, and TSN-880 PROMINAR series spotting scopes beats a fluorite crystal objective lens. This natural mineral has an outstanding feature of very low dispersion that cannot be found in optical glass. This characteristic enables Kowa to eliminate color blur almost completely and dramatically increase resolution and contrast. 

We've been very excited about carrying and personally using the Kowa spotting scopes and have no problem recommending either the TSN-550, TSN-770 or TSN-880 series spotters.