William Optics RedCat 51 II U 51mm f/4.9 Petzval Apo Refractor Telescope – Red #L-RC51II-U

Price: $1,598.00
(as of Nov 04, 2023 08:58:24 UTC – Details)

Ultra-Portable Petzval Apo Refractor for Astronomical and Terrestrial Imaging Is it a telescope? Is it a camera lens? Is it both? Call it what you will, but the new, 2nd generation William Optics RedCat 51 is an affordable, compact, light-weight Petzval refractor with razor sharp optics in a compact and rugged package. It’s ideal for ultra-wide-field imaging of the deep sky and for terrestrial imaging of birds, landscapes, and wildlife. The RedCat 51 focal length is 250mm, which many find to be a sweet spot for wide field astrophotography. The Orion Nebula, Andromeda Galaxy, Heart and Soul Nebulae, North America Nebula, and many more popular regions of the sky easily fit into the field of view. With premium apochromatic optics in a Petzval design, the RedCat 51 is sharper and better corrected than many brand-name camera lenses of similar focal length. The superb optical design and a fast focal ratio of f/4.9 make this little scope a powerful imaging tool. Fast, Razor-Sharp Optics and Flat Field with Big Image Circle The RedCat 51 incorporates high-quality synthetic fluorite FPL53 and FPL51 glass in a 4-element, 3-group classic Petzval design for an superb color correction and an exceptionally flat field. No field flattener is needed with this scope. The RedCat is engineered to have a big 43mm image circle compatible with APS-C and full-frame DSLRs, mirrorless, and dedicated astronomy cameras. With a camera with a full-frame (36mm x 24mm) sensor, the telescope offers an expansive field of view nearly 10 degrees across the sensor diagonal. Please note that unlike previous versions of the Redcat telescope, this latest II-U version CANNOT be used visually. The William Optics D-EP90-125-RC51-SL diagonal will not fit on this scope.
Specifications Focal Length: 250mm Diameter: 51mm Aperture: f/4.9 Focuser: Helical focuser Image Circle: >43mm Tube length (fully retracted): 228mm Tube length (fully extended): 291mm Dew Shield Circumference: 255mm Dew Shield Diameter: 80mm Weight: 2.9 lbs / 1.3kg (OTA only) 3.9 lbs / 1.76 kg (OTA with ring and dovetail) Interchangeable T-mounts (sold separately): Canon EF, Nikon F, Sony E, Pentax, Micro Four Thirds, Fuji
What’s in the Box Soft carry case RedCat 51 II 51mm f/4.9 OTA – Red OTA with Black Accents Tube ring and dovetail rail M48 Camera Threaded Mount (Agena note: We don’t know why WO lists this as a separate item. It isn’t. This is just the male M48 male thread at the rear end of the telescope on the attached tilt adapter, and it is not a separately included item. Required camera-specific 48mm Wide T-Ring sold separately and is reqired to connect your DSLR to this thread. See the “Related Accessorie