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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.
Specifications:
Observing mode: 148.5mm Aperture size: 130mm
Net weight: 10.5kg
Focal length: 1000mm
Gross weight: 12.5kg
Focal ratio: f/7.7
Image circle: 60mm
Objective lens: Quadruplet air-spaced APO (including two ED glass)
Imaging mode: 116mm(from the base of M48X0.75 male thread)
136mm(from the base of M54X0.75 male thread)
156mm (from the base ofM68X1 male thread)
186mm (from the base of M76X1 male thread)
Rear-end thread type: M86×1-M68×1
M68x1-M54×0.75
M54×0.75-M54x0.75
M54×0.75-M48x0.75
(M48X0.75 filter thread inside)
Total length: 842.5mm (including 1.25″ eyepiece holder as dew shield contracted)
1011.5mm (including the 4 piece adapter as dew shield contracted)
889.5mm (including 1.25″ eyepiece holder as dew shield fully stretched)
1061.5mm (including the 4-piece adapter as dew shield fully stretched)
Rear end of the 4-piece photographic adapters: M48x0.75