ZWO FF80 APO QUADRUPLET f/7.5 QHY10 2 arcsecond at sidereal velocity

2 arcsecond at sidereal velocity Tracking accuracy

The GM4000 can be supplied also in a special version for very low temperature operations: ask our team if interested

25" barrel Full-extension length 28mm SKU

The focal plane is at the front of the optical system so it is not possible to use an eyepiece

The Dew Heater Ring features two storage clips to keep the power and thermistor jacks secure when not in use while accommodating the telescope's dust cover

ZWO FF80 APO QUADRUPLET f/7.5 QHY10 2 arcsecond at sidereal velocityThe ZWO FF80 is a professional apochromatic flatfield Petzval quadruplet with a focal ratio of f 7. 5 and an image circle of 44mm in diameter. The FF80 includes two Extra Low Dispersion glass elements for superb correction of chromatic aberration. The FF80 supports full frame cameras such as the ASI6200, with a central RMS radius of only 3 microns. Differently from standard ED refractors, the FF80 features a Petzval design that does not require to set