Description The Excalibur lens has been used to set almost every freestyle record the world over. The optical designer who engineered the Excalibur lens, designed it for one purpose, to be used in a bow scope. Most other scope lenses are designed for eye glasses then adapted for scopes. SP Archery found that usually a simple or cheaper solution is never an improvement. A curved plastic eye glass lens is very difficult to make into a perfect optical centre. It is impractical to change lenses if they are not optically centred because you will have to sight-in every time they are changed. Couple this with the fact that a curved lens generates reflection. To fit Speciality Archery Super Scope Housing 4 strengths available 3 sizes available
