Starfield Optics 2.0" Adjustable 0.8x Reducer.

  Starfield Optics 2.0" Adjustable 0.8x Reducer: Simplifying Astrophotography Easy Back Focus Adjustment: Designed for straightforward back focus calibration, making it easy to achieve the ideal 55mm back focus. Adaptable for Complex Setups: Eliminates the hassle of dealing with multiple adapters, even when using additional accessories like filter wheels and rotators. Precision Fine Tuning: Allows for fine adjustments with just a small twist, ensuring perfect focus and image quality. Simple Installation Process: Directly attaches to the Géar 80 / 90 mm telescope focuser, with easy removal of the Axil lock using the provided 1.5mm Allen key. Versatile Compatibility: Suitable not only for the Géar series but also for other telescopes ranging from 70mm to 102mm aperture. Customizable for Various Telescopes: Accommodates different focal ratios and telescope sizes, with specific back focus measurements for each (e.g., 102mm/f/7 - 55mm). Internal Filter Capability: Designed to allow the addition of filters inside the reducer, enhancing photographic capabilities. Specifications Design:Corrector and reducer for refractor telescopes Telescopic connection:M63x1 external thread Camera connection:M48x0.75 external thread Reduction factor:0.8 xLenses:3 lenses with ED element Coating:multi-coating and internal blackening Working distance:variable (adjustable) Adjustment range of the distance:0-17 mm stepless Suitable for:Refractor telescopes from 102 mm to 155 mm aperture with focusers from 2.5"