SharpStar 140PH - 3" - 0.73X Focal Reducer 3" - 0.73X Focal Reducer for the 140PH Apo Refractor Full frame Focal Reducer Focal Ratio Result: f/4.8 for the 140PH Form Factor: Triplet Lens Image Circle Result: 44 mm Back Focus: The standard 55 mm Back Focus Total Weight: Only 0.9 kg This SharpStar 140PH 3" - 0.73X Focal Reducer is ideal for use with the SharpStar model 140PH Refractor telescope for doing full-frame imaging with DSLR or other electronic cameras. The new 3 inch full frame reducer from SharpStar, for the 140PH APO is made of high quality metal, with a beautiful design, and it's simple to use. The focal ratio is reduced from the original f/6.5 to f/4.8, combined with your existing 140PH APO to provide sharp images and bright peripheral stars, It's an indispensable accessory for astro-imaging enthusiasts. A triplet air-spaced design, including a 360° rotator and M48 thread. Fully considering the needs of pro users, the back focus including rotator is the standard 55 mm. The user can also unscrew the rotator if desired, to make the back focus 105 mm. The front thread is M88 X 1 mm, which is directly connected to the 140PH 4-inch focuser adapter, making it a professional astro-imaging combination. The product is fully optimized to meet your stringent requirements for image quality. If you are using the SharpStar 140PH APO Refractor telescope for visual observations and are now ready to embark upon astro-imaging work, this is the ideal Focal Reducer you will want and appreciate. Specifications: Model: 140PHSR Full frame Focal Reducer Optics Designed for use with 140PH Apo Refractor Size: 3" Form Factor: Triplet Lens Focal Ratio Result: f/4.8 Image Circle Result: 44 mm Back Focus: 55 mm Total Weight: 0.9 kg Lens Coatings: Full Multi-layer coatings Length: 106 mm Outer Diameter: 88 mm
