The Bresser 70° Eyepiece Set is a great set of eyepieces for the amateur/intermediate astronomer. These eyepieces utilize the Erfle design, which is a 5 element design. One excellent aspect of the Erfle design is the eye relief. The 35mm, 30mm and 25mm 2″ eyepieces included in the kit all have large amounts of eye relief, making for very comfortable viewing sessions.
The set also includes 3, 1.25″ eyepieces of 10mm, 15mm, and 20mm focal lengths. These work well for lunar and planetary observation.
A drawback of the Erfle design is these eyepieces don’t provide a well corrected field when used in anything with a focal ratio of f/6 or faster. When using these eyepieces at f/5 or f/6 you will see noticeable come near the edges of the field of view.
That being said I really enjoy these eyepieces. The 70° apparent field of view makes me feel as if I am immersed in the sky. They are solidly constructed and are fully multi-coated for maximum light transmission. Whether you are a new observer looking for a good eyepiece set, or an experienced observer that wants a new set of eyepieces for outreach, this eyepiece set is one I would recommend.