The Kowa TSN-EX16 increases the magnification of the current Kowa TSN-880/770 spotting scopes by 1.6x when combined with the original eye-piece Kowa optical technology and superior lens coatings deliver superb optical performance with less than 5% light loss even at high magnifications. Perfect for long range observation and digiscoping for both terrestrial and astronomical subjects. The high quality engineered TSN-EX16 is easily mounted on the accessory thread of the Kowa TSN-880/770 scopes between scope body & eyepiece. The styling perfectly complements the spotting scope body. The TSN-EX16 features a bayonet mount for Kowa compatible eyepieces. (see chart opposite).The TSN-EX16 can be used on angled and straight spotting scopes from the Kowa TSN-880/770 series. The TSN-EX16 1.6x Extender is fully compatible with a range of Kowa digiscoping adapters. Incredible telephoto power far beyond any conventional photography system and much more compact. The Kowa TSN-EX16 works perfectly with out Telephoto lens when combined with the TP-88EC1 Prism Unit and compatible eyepiece