William Optics 90° 1.25″ Zenith prism RedCat

William Optics 90° 1.25″ Zenit Prism RedCat: turn your RedCat into a spotting scope

This William Optics diagonal prism is made for the RedCat 51 (51/250 apo) and turns that astrograph into a visual instrument in a jiffy. The prism deflects the light 90 degrees and renders the image upright and laterally correct: exactly as you see it with the naked eye.

The BAK-4 precision glass with anti-reflection coating keeps light transmission high and contrast sharp; the matte black interior suppresses stray light. Via the M56 connection with a clamping ring, the prism sits securely and scratch-free on the RedCat, and the 1.25-inch side accepts any standard eyepiece.

Nature by day, moon by night

With upright imaging, the RedCat suddenly becomes an excellent spotting scope for birds and landscapes. And at night, you can recognize moon craters directly, without mental mirroring.

Featured accessories

Combine the prism with a 1.25-inch eyepiece of your choice; with a low magnification, you'll get the most out of the RedCat's wide field.

For whom yes and for whom no

• ✓ RedCat 51 owners who also want to use their astrograph visually
• ✓ Nature observers who go out with the RedCat during the day
• ✗ Owners of the Cat 51 WIFD: there is a dedicated prism version for that.

Specifications

You can find more accessories for this brand at the William Optics brand page.