WILLIAM OPTICS REDCAT 51 F/4.9 PETZVAL REFRACTING TELESCOPE Generation 2

From the beginning, the goal was to create the best possible design for an affordable, small, lightweight, and fast Apochromatic refactor for astrophotography. The unique optical design includes the highest quality glass for the best possible color correction and flat large image circle. The results is a 51mm objective lens, in a sleek Petzval design, for a full frame image.

Optical design: 51mm lens, in a sleek Petzval design, using Synthetic Fluoride (FPL53 and FPL51) glass for a full frame flat field image. The optical quality provides exceptional performance at fast focal ratio of f/4.9. The RedCat 51 will out resolve most high resolution DSLR lenses of similar focal lengths.

Field rotator: Inspired by luxury watches, the telescope's filed rotator is laser etched with a  degree indicator. To ensure that you will have the most precise framing possible in a small portable system, the camera can be  rotated to within a degree of accuracy.

Bahtinov cap: The cap with this telescope not only protects the glass from the elements, but it also has one of these most useful tools when it comes to focusing. The Bahtinov Cap creates three lines that pass through a bright star. There is a main large line, and a smaller cross-section of two lines making an "X". The goal is to get the large line centered between the X and centered on the star. As soon as that is done you have perfect focus in as little as 2-3 seconds.

The new models have a modified tilt adapter (see PDF in the appendix)

Characteristics:

• 4 lens Petzval optical design
• Aperture 51mm, focal lenght 250mm, f/4.9
• Massive OTA from Aluminum alloy
• Compact and ultra portable
• Field rotator
• Helical focuser design
• Tilting platform
• Field illumination even for full frame sensors

• OTA RedCat 51/250mm
• Mounting plate 210mm
• Rversible dew cap
• Mounting ring
• Bahtinov mask in cap
• Padded carrying case