ZWO FF131 f/7.5 APO REFRACTOR

The ZWO FF131 is an apochromatic quadruplet flat-field astrograph that offers high performance for an exceptionally low price. The quadruplet design makes it perfect for both visual observation and astrophotography. The objective lens features an element of extra-low dispersion glass (ED) that minimizes chromatic aberration. 

The ZWO FF131 is a versatile instrument and excels not just at imaging, but as a grab & go visual telescope (eyepieces & diagonal sold separately).

Unlike traditional refractors, the quadruplet design does not require a separate field flattener and you do not need to calculate precise backfocus. With a large image circle of 44mm, the ZWO FF131 is a highly capable imaging telescope.

The OTA itself weighs just 7.9kg (9.4kg with tube rings and dovetail bar) and has an overall length of 878mm with the dew shield contracted, making it easy to transport.

The 3" dual-speed rack & pinion focuser is precise and rigid. It is natively compatible with most motorized focusers on the market including the ZWO EAF. The focuser includes 2" and 1.25" visual adapters as well as M48 and M54 camera adapters. On the rear there is a 360 degree rotator with fine rotation angle markings for precise framing. A 2" mounted filter can be attached to the rear M48 camera adapter.

Unlike most refractors, the FF131 includes two finderscope bases on either side of the focuser, allowing you to attach both a standard guide scope and control unit such as the ASIAIR without the need for additional accessories. The handlebar also includes a finder-style slot, allowing for even more possibilities.

Specifications

 Items included

• FF131 OTA
  
• Pair of tube rings
  
• 300mm Losmandy bar
• 2" visual back
• 1.25" eyepiece adapter
• M78 - M54 adapter
• M54 - M54 adapter
• M54 - M48 adapter
  
• Manual
  

Downloads

Instruction manual