Test
Results
Art.–Nr. TS-PL-04
TS Ploessl 4mm
Sharpness:
Fine for a 4mm eyepiece. Our measurement system is diffraction limited
at this focal length to about 1.4 arc minutes.
x-axis: distance from optical
axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
The apparent field of view is approx. 46°
Contrast:
Very good for 4mm focal length.
Aberration:
Nothing noticeable.
Eye Relief:
Very short eye relief because of the short focal length. Viewing the
complete field of view is not possible without looking into the eyepiece under
different angles – or fold the rubber eye cup.
Mechanical Quality:
Simple, but not bad. Unfortunately no blackened filter thread.
Summary:
Great for planetary observations. Just beaten by the Pentax XO – but
this is clearly another League in price.