Art. –Nr. RE-SWA-20
Super Wide Angle 20mm
Very good at the center, but drops towards the edges
x-axis: distance from optical axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
Our measurement gives 67° - close to the manufacturer data.
Slight cushion distortion as well as field curvature.
Eye relief is close to be comfortable, but you can not wear eye glasses.
Good quality with rubber eye guard, grip coated body. Fully multicoated and well blackened inside.
You can not use the full apparent field of view in good optical quality, and really not recommended for F/5 or F/4. However, as the field is much larger than for Plossl eyepieces, there is an advantage at a more or less equal price. Edge quality is enhanced remarkably when combining this eyepiece with a Barlow lens.