The Williams Optics ZenithStar 61 is a doublet apochromatic refractor telescope that is absolutely beautiful. With its low weight I am easily able to mount it on an iOptron SkyGuider Pro and take 60 second exposures. The FPL-53 glass makes for some colorful sharp stars easily focused with the dual speed focuser. With a 360mm focal length this telescope pairs well with a DSLR. It is now a permanent member of my grab and go bag. Below is a picture I took with no guide camera on a windy night using a Canon Rebel EOS T7i.
Z61 APO Doublet Telescope Specs
- Aperture: 61mm
- Focal Ratio: F/5.9
- Focal Length: 360mm
- Objective Lens: Synthetic Flourite FPL-53
- Focuser: 2″ 10:1 Dual-Speed
- Tube Weight: 3.2 Pounds
- Dedicated Field Flattener: Flat61
- Back Focus: Z61 Spacing Diagram
Flat61 Field Flattener
The Flat61 is a must if you plan to take pictures. It will prevent the edge of your pictures from being rubbish. Being designed for the F/5.9 focal ratio of the ZenithStar61 your images will stay crisp right to the edge.