Designed for astrophotography, the Ultra Cat 76 WIFD 76mm f/4.8 Apochromatic Refractor Telescope from William Optics uses an unorthodox design for supporting heavy cameras and delivers a wide field with a fast focal ratio plus a Petzval lens for beautiful images. The WIFD (William Optic Internal Focus Design) places the 10:1 rack-and-pinion focuser in the center of the optical tube, eliminating the tilt and vignetting that can occur from heavy cameras on traditional rear-mounted focusers. The five-element Petzval-style lens yields a sharp image with no need for a flattener, and the dust cover has a built-in Bahtinov mask for tack-sharp star images. This optical tube assembly requires a mount and a tripod for use.
Optical Tube Assembly
- Fast f/4.8 focal ratio and 365mm focal length for wide field of view and fast exposure times
- Apochromatic Petzval-style five-element lens, including ED and Lanthanum glass, produces rich views with minimal chromatic aberration
- Sharp image with no need for a separate field flattener
- Supports 50mm image circle for full-frame, APS-C, and micro four thirds cameras
- Dust cover with integrated Bahtinov mask allows for fine focusing on stars
- Sensor Tilt Xterminator/Rotator with M54 and M48 camera adapters
- T-mount compatible with Canon EF and RF, Nikon F and Z, Sony E, Pentax K, micro four thirds, and FUJIFILM X
Focuser
- William Optics Internal Focus Design places focuser in center of OTA to balance the weight of imaging systems
- Precise internal sliding of fixed optics prevents image shift, ensuring stable and clear observations
- 10:1 coarse and fine focus rack-and-pinion design
- Compatible with ZWO EAF automatic focuser
- 0-20mm focus travel, ruler to 21mm
- Dial-style thermometer for gauging temperature effect on optical tube
Use and Handling
- Anodized aluminum optical tube
- Sturdy mounting rings and handle assembly with 210mm Vixen/Arca-style dovetail
- Additional dovetail with thumbscrews on handle for guidescope
EAN: 6977641322768