Test
Result
Art. –Nr. SKY-Zoom-8-24
Skywatcher Zoom 8 – 24mm
Sharpness:
Very good at 8mm, also close to the edge. At 24mm just a bit more than
half of the field of view is really sharp, close to the edge (10% of field of
view) is blurry.
x-axis: distance from optical
axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
The apparent field of view is approx. 64° at 8mm, but to be viewed in
total only if you move your head. At 24mm is is going down to 36° only.
Contrast:
Very good contrast over the complete zoom range.
Aberration:
Pincushion distortion is noticeable at 24mm and somewhat less at 8mm.
Eye Relief:
Comfortable. At long focal length the field of view is moving in the
outer parts when turning the head. This effect is normally known from
Kellner-type eyepieces.
Mechanical Quality:
Nice quality with foldable rubber eye cup and grip coated body. However,
the zoom mechanics has a little bit of play.
Summary:
Contrary to most zoom eyepieces the optical drawbacks of this zoom are
in the long focal range. At short focal length you get a nice wide angle
eyepiece with really good optical performance.