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The ZWO FF130 APO is a refractive astrograph with the powerful flatfield optical design which saves you from the expensive cost of a field flattener. It eliminates the trouble of calculating the back focus distance of the flattener and connecting various accessories to achieve that distance. You can just connect any possible accessories you need. As long as the target is focused, the whole optical system is perfect for imaging. This makes the whole setting up process much more convenient, and saves your time, allowing you to pay more attention to the image shooting itself.
Technical Specification
Specification
Details
Observing Mode Aperture
148.5mm
Aperture Size
130mm
Focal Length
1000mm
Focal Ratio
f/7.7
Image Circle
60mm
Objective Lens
Quadruplet air-spaced APO (including two ED glass)
Imaging Mode Back Focus
116mm (from base of M48×0.75 male thread)
136mm (from base of M54×0.75 male thread)
156mm (from base of M68×1 male thread)
186mm (from base of M76×1 male thread)
Rear-End Thread Type
M86×1 to M68×1
M68×1 to M54×0.75
M54×0.75 to M54×0.75
M54×0.75 to M48×0.75 (M48×0.75 filter thread inside)