WILLIAM OPTICS ULTRA-CAT 56 f/4.8 REFRACTOR Counterweight with a finely CNC machined

with a finely CNC machined and anodized aluminium base

SKU 170mm carbon look

The focuser includes a high-precision 360° rotator with engraved scale and knurled locking screw

resulting in the observed pattern

for example when using refractors

WILLIAM OPTICS ULTRA-CAT 56 f/4.8 REFRACTOR Counterweight with a finely CNC machinedThe William Optics UltraCat56 is a high performance 56mm apochromatic refractor designed for astrophotographers who demand top tier performance. Featuring a 5 element advanced Petzval optical design and a fast f 4. 8 focal ratio, it delivers breathtaking edge to edge clarity and vivid details, making it perfect for capturing expansive celestial views. Its robust build, exceptional optics, and innovative features redefine the standard for