The AP 91/448 GreyCat 91 combines compact dimensions, an attractive price, and excellent optical performance. It is designed for both astrophotographers and nature photographers who require high image quality and reliable construction. The optical system is based on a Petzval design with four elements arranged in three groups, using high-quality FPL53 and FPL51 glass. This configuration produces a color-accurate, fully corrected image field with a diameter of over 55 mm, making it suitable for full-frame cameras. The fast focal ratio of f/4.9 enables shorter exposure times and efficient light gathering.

This set includes the William Optics AP 81/478 Gran Turismo 81 IV optical tube assembly and the William Optics UniGuide 50 mm guidescope in red. The Gran Turismo 81 IV is an apochromatic triplet refractor featuring an FPL-53 element for outstanding color correction and high contrast performance. It is a versatile instrument designed for both visual observation and astrophotography. For visual use, the telescope can be combined with an optional zenith mirror to provide high-contrast views of the Moon and planets.