RedCat 51 Gen 3
William Optics
From ~$844.11
4 stores
The William Optics RedCat 51 Gen 3 is a compact apochromatic refractor telescope that merges cutting-edge technology with user-friendly features, making it an ideal choice for both budding astronomers and seasoned astrophotographers. Featuring a 51mm quadruplet Petzval APO design with FPL53 and FPL51 synthetic fluorite glass, it ensures a flat field and exceptional color accuracy for full-frame imaging. The innovative patented Internal Focus Design (WIFD) enables seamless compatibility with electronic focusers like the ZWO EAF, allowing precise autofocus for astrophotography. With its 250mm focal length considered ideal for wide-field astrophotography, expansive objects like the Orion Nebula, Andromeda Galaxy, and nebulae complexes easily fit into the field of view.
Astronomy Plus
Redcat 51 WIFD F/4.9 Petzval Refractor (L-RC51RDIII-WIFD)
Worldwide shipping
CA$1,149.00
~$844.11
High Point Scientific
RedCat 51 Gen 3 APO f/4.9 Refracting Telescope with WIFD
Ships to US only
$888.00
Agena Astro
William Optics RedCat 51 III WIFD f/4.9 Petzval Refractor Telescope
Worldwide shipping
$888.00
Astroshop.eu
Apochromatic refractor AP 51/250 RedCat WIFD
Worldwide shipping
€999.00
~$1,185.94
Specifications
| Glass Type | Synthetic Fluorite (FPL53 and FPL51) |
| Tube Length | 298 mm |
| Focuser Mount Thread | M54 x 0.75 |
| Focal length | 250 mm |
| Focuser Type | WIFD (William Optics Internal Focus Design) |
| Weight (with rings, dovetail, saddle) | 2.4 kg |
| Focal ratio | f/4.9 |
| Compatible with EAF | ✓ |
| Focus Travel | 33 mm |
| Field Flattener Required | false |
| Dew Shield Diameter | 84 mm |
| Image Circle | 43 mm |
| Back Focus Range | 26.7 mm |
| Flat Field | ✓ |
| Aperture | 51 mm |
| Weight (OTA Only) | 1.8 kg |
| Field of View (full-frame sensor) | 10° |
| Optical design | Petzval Apochromatic Refractor (4 elements in 3 groups) |