WILLIAM OPTICS ULTRA-CAT 56 f/4.8 REFRACTOR Counterweight SKU ASA-60Fx0

SKU ASA-60Fx0

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

the OCAL makes the daunting task of collimation a breeze

The Baader Contrast Booster filter increases contrast and cuts the blue end of the spectrum

for example when using refractors

WILLIAM OPTICS ULTRA-CAT 56 f/4.8 REFRACTOR Counterweight SKU ASA-60Fx0The 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