ZWO FF90 APO Flat-Field Apochromatic Refractor (FF90-APO)

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ZWO FF90 APO Flat-Field Apochromatic Refractor The ZWO FF90 APO Refractor is a lightweight, compact refractor telescope designed for visual observation and astrophotography. *Focus is achieved within a 45–75 mm back focus range, measured from the M54–M48 interface shoulder. Main Features Flexible Connectivity for Multiple Configurations Powerful Uniqueness 1. Lightweight & Compact This unit features a 90 mm aperture and 609 mm focal length (f/6.8) for portability and performance. The optical tube weighs 3.92 kg. Total system weight is 4.52 kg including the mounting rings and dovetail plate. 2. Four-Element Optical Design The optics use a four-element, air-spaced apochromatic design. All elements work together to deliver a flat imaging field. One ED glass element effectively reduces chromatic aberration. This results in superior color correction and image clarity. 3. 44 mm Image Circle — Full-Frame Support With a 44 mm image circle, the unit supports full-frame sensors. It is ideal for use with an asiair pro for smart control. It delivers sharp star fields with excellent edge-to-edge performance. This ensures consistent quality across the frame. 4. Native Flat-Field Design The optical system features a native flat-field design. This eliminates the need for an additional field flattener. Complex back focus calculations are not required. Simply attach your imaging setup and start capturing once focused. Convenient Mechanical Design 5. Coarse & Fine Focus Adjustment Equipped with a rigid 3-inch rack-and-pinion focuser, it offers precise 1:10 dual-speed coarse and fine adjustments. A built-in 360° rotator at the rear allows for smooth, accurate camera angle adjustments during your session. 6. Retractable Dew Shield This model features a retractable dew shield for portability. This helps protect your optical tube in the field. Precision CNC machining and internal anti-reflection coatings help minimize stray light to enhance image contrast. 7. Quick-Release Mounting Rings The mounting rings are detachable. This allows for quick and easy setup or teardown at any dark site. 8. Photography Extension Tube The package includes a photography extension tube with a 2-inch filter thread and M48 and M54 adapters. These components allow for easy integration with a wide range of modern imaging accessories and cameras. Performance Charts Optical Layout Star Field Map Product Diagram Technical Specifications In the Box Warranty ZWO 2-Year Warranty Show more