"Blue Sea" wrote in message
om...
I just got the nikon 10x42, based on the general comments of this
bino.

I notice that when aim at california licence place with red California
Logo against white background with dark blue CA licence place number,
I see faint red lines around the licence id alphabets. Is this
chromatic aberration typical for all hig-end 10x binoculars?

Thx

I'd like this bino, don't have experience with other high-end binos,
and feel that binos need ED glass and auto focus. Camera lens has
better optical then all binos lens.

It is a form of chromatic aberration called lateral color. This is a
variation in magnification with wavelength, and it is mostly caused by the
eyepieces. Remember that an eyepiece has to create an image over a view
angle of about 50 to 67 degrees, depending on the design. The objective of
the binocular only has a view angle of 6 to 8 degrees or so. I have not
seen an eyepiece that didn't show at least a little lateral color,
especially near the field edge.

There is little point to ED glass in 7 to 10 power binoculars. The
magnification is too low to bring the secondary color - variation of focus
with wavelenght - into play. ED glass makes sense in spotting scopes used
above about 30x or so.

Clear skies, Alan