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4mm Focal Ratio Tele: F/5
For curved focusers like the one in the image above
the ideal choice for astronomy enthusiasts
The QE curve and readout noise are very important parameters to measure the camera's performance
FF90 APO Flat-Field Apochromatic Refractor/FF90 APO Bundle M54 adapter 4mm Focal Ratio Tele: F/5Lightweight & Compact Designed for Both Visual Observation and Astrophotography *Focus can be achieved within a back focus range of 4575 mm, measured from the M54M48 interface shoulder. Main Features Flexible Connectivity for Multiple Configurations Uniqueness 1. Lightweight & Compact The ZWO FF90 APO features a 90 mm aperture and 609 mm focal length (f 6. 8), offering an excellent balance between portability and performance. The optical tube weighs
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