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William Optics RedCat 51 APO f/4.9 Refracting Telescope
William Optics designs an impeccable astrograph in the Redcat 51 APO!
- Features a tilt-adjustment mechanism on the rear to ensure that your camera sensor is squared with the optical axis
- Features a focusing index on the lens body
- Features a new mounting ring and dovetail rail
- Ultra-compact 51mm Petzval apochromatic refractor with razor sharp optics and intrinsically flat field
- Ideal for wide-field astronomical or terrestrial imaging with APS-C or full-frame DSLR, mirrorless, or dedicated astronomy cameras
- Precision helical focuser, field rotator, and Bahtinov mask for fast and precise set-up
- Includes slot for 48mm astronomy filters and M48 threads to accommodate a wide range of cameras
Light-weight with razor sharp optics. It’s ideal for ultra-wide-field imaging of the deep sky and for terrestrial imaging of birds, landscapes, and wildlife.
Fast, Razor-Sharp Optics and Flat Field with a Large Field of View
The RedCat 51 / SpaceCat 51 utilizes FPL53 and FPL51 glass in a 4-element Petzval design for excellent color correction and an exceptionally flat field. No field flattener will ever be needed with this scope. The RedCat 51 is constructed 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 a field of view nearly 10 degrees.
Usable as a Portable Visual Telescope too
The RedCat 51 is optimized as an imaging instrument; however, it also serves as a great visual scope. Just add William Optics' erect image diagonal for visual and/or daytime use.
Precision Focuser and Field Rotator
The engineered field rotator makes it easy to frame your images. The field rotator is laser etched and fully rotatable by 360 degrees. It is also marked to a precision of one degree.
Accommodates a 48mm threaded astronomy filter and a T-ring adapter for your camera of choice.
Ample Back-Focus to Accommodate DSLRs and Many Astro-Imaging Cameras
The lens assembly can be moved within the telescope body over 33mm by rotating the focusing collar in the front.
- Super-bright Bahtinov mask that makes it a snap to focus the telescope in an instant
- Dual-spec reversible mounting base for Vixen-style astronomy mounts or an Arca-Swiss mount used in photography tripod heads.
- A sun-shade/dew-shield which you can invert and slide over the objective cell to minimize the length of the tube for transport and storage.
- Beautiful Anodized aluminum alloy Tube
Ideal for Bird, Wildlife, and Nature Photography
it has a close focusing distance of only 3.7m. Use the 2" nosepiece from the diagonal as an extension tube and the focusing distance drops to 3.0m.
- Soft carry case
- RedCat 51mm f/4.0 OTA - Red OTA with Black Accents
- M48 Camera Threaded Mount
- Patented Bahtinov Mask
Model Number L-RC51Ix Telescope Series William Optics Cat Focal Ratio f/4.9 Optical Design Refractor Telescope Aperture 51mm (2") Telescope Mount Type No Mount - OTA Only Type of Electronics OTA Only - No Electronics Number of Refractor Elements 4 (Quad) Focal Length (mm) 250 mm Image Circle 44mm Focuser Style Helical Refractor OTA Length - Extended (in.) 12" (305 mm) Refractor OTA Length - Retracted (in.) 8.86" (225 mm) Telescope OTA Weight (lb.) 3.24 lb. (1.47 kg)
- Country of Manufacture: Taiwan
- S&T Test Report
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APM products do not qualify for our 30 day return policy.
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Look beautiful , as expected , thank you very much, try to take picture with it
but got no luck , cloudy all week, over all the scope is very nice.
I bought this little APO a couple of months ago to take widefield shots that won't fit in single frame when I use a 80mm Apochromat. Among the objects I have captured are the North America Nebula, the (entire) Veil Nebula, parts of the Antares Region, and large swaths of the sky in Orion. In addition, objects like the Pleiades look very good with a bit of space around them. As the season progresses, I look forward to working more in Orion, and photographing the Ring and Cone Nebulae. I bought the WO diagonal for this refractor, but I haven't done any visual observing, but it is a great tool for astrophotography. If you're new to AP, I would STRONGLY consider a small APO like this. It is easy to find objects in the sky, since the field of view is wide and forgiving, and the focus is sharp enough to pick up double stars (like Polaris). The only thing I found is that with an AVX or larger, you will need to acquire a smaller (say 2kg or 5lbs) counterweight. The 5kg (11 lbs) counterweights that come with the AVX and larger mounts have to be placed so high on the bar that collisions are a threat. The color and clarity of this scope are excellent, and there are a lot of nice touches that you find in Taiwanese and Japanese products - like the included Bahtinov mask. If you have a larger mount, consider attaching a longer dovetail; the WO dovetail is a bit short.
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