Starfield Optics 2.5" Adjustable 0.8x Reducer.

  Optimize Your Astrophotography with Starfield Optics 2.5" Adjustable 0.8x Reducer Effortless Back Focus Adjustment: Designed for easy setting of back focus to 55mm, with an adjustment scale of 14.87mm for precision. Adapter-Free Solution: Eliminates the need for multiple adapters, even when using additional accessories like filter wheels and rotators. Fine Tuning Made Simple: Allows for minor adjustments to achieve perfect focus and image quality. Universal Compatibility: Direct attachment to telescope focusers, with potential use on various telescope models (larger than 102mm) with the appropriate adapter. Comprehensive Focuser Calculations: Provides specific back focus requirements for different telescope models (e.g., 102mm/f/7 - 69.87mm, 155mm/f/8 - 62.57mm). Ease of Installation: Includes a 1.5mm Allen key for loosening and attaching the reducer to the focuser. Internal Filter Integration: Designed to accommodate filters within the reducer, enhancing astrophotography cap