Designed specifically for their 9.25" EdgeHD optical tube assembly (OTA), the Celestron 0.7x Focal Reducer Lens speeds its focal ratio from an f/10 to a much faster f/7.1 for drastically reduced exposure times with the same results, and wider fields of view. The reducer maintains the EdgeHD optic's flat-field performance through the use of a 4-element lens system using Lanthanum glass, with blackened edges, and anti-reflection fully multi-coated optics. The Reducer is made to attach directly to the back of the EdgeHD OTA which keeps the same back focus for cameras and accessories so there is no need for new gear. A 60mm clear aperture is optimized for larger full-frame sensors to avoid vignetting of the scene.
Performance
- Use to reduce the OTA focal ratio from a moderate f/10 to a much faster f/7.1 that drastically reduces exposure time to capture the same brightness of an object
- 4-element lens design specifically engineered for the 9.25" EdgeHD optical tube to maintain performance
- Maintains the same back focus as the standard f/10 OTA to allow the use of other EdgeHD adapters and accessories
- Increases field of view to see more of the sky at any magnification
- Lanthanum glass elements for clear, high contrast viewing, while minimizing chromatic aberration
- Anti-reflection fully multi-coated optics maximize light transmission for improved color, clarity, and contrast
- Blackened lens edges minimize internal reflection and maximize contrast
Use and Construction Details
- Attaches directly onto the 3.25" threads of the EdgeHD optical tube to reduce vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders
- 60mm clear aperture lens optimized for a 42mm image circle for use with large CCD sensors
- Machined aluminum housing with powder-coated finish makes it lightweight and durable
- Threaded metal covers for both ends of the lens assembly protects against dust and scratches
UPC: 050234942454