Art. –Nr. BA-OR-05
Baader Planetarium Genuine Ortho 5mm
Sharpness:
Perfect sharpness, to the diffraction limit of our measurement
equipment, nearly over the whole field of view. Especially to the edges better
than our Plossl- and Super Plossl eyepieces.
x-axis: distance from optical
axis in °, y-axis: resolution in arc minutes
Apparent Field of View:
The apparent field of view is about 46°, bigger than expected.
Contrast:
Really good contrast, remarkably better as with our Plossls. It is very
close to the Pentay XO 5mm.
Aberration:
Noticeable pincushion distortion. This is surprising for an orthoscopic
eyepiece, however, for astronomical observations this is not a big drawback.
You will recognize it, if you look on straight lines near to the edge.
Eye Relief:
Eye relief is very short, as expected. If you do not worry about that,
the look into the eyepiece is fine.
Mechanical Quality:
The very good quality is described on the main ortho page.
Summary:
In comparison to the Super Plossl eyepieces on the cheaper side the advantage
is better edge sharpness, better contrast and lower sensitivity to reflexes. On
the high-end side it is close to the Pentax, but beaten in contrast (just a
bit) and abberation. To be fair, the Baader Genuine Ortho will cost you not a
third of the Pentax