2017 March 20 21.46 to 21.50UT.
Spring has sprung.
10x42 L IS
Jupiter, a severe test of possible CA. Disc white or off white.
Fairly good transparency. No cloud seen after rainy day.
Binocular braced IS off.
Some CA just detectable centre field, but this could be atmospheric. Low elevation ~18 degrees.
30% away from centre to edge. Definite CA seen. Even maybe 20% from centre.
A bit more towards edge.
IS on. definitely more false colour, but still not objectionable. But I see it if I want to.
2 moons easy, possibly also moon 4, but very light polluted and not the clearest night. Jupiter low.
My pupils probably 5mm so limited by binocular exit pupil.
So, yes I can see CA if I want, but this is one of the best binoculars I have looked through.
Binoculars are two poor telescopes connected together.
The 18x50 IS shows much more CA because of higher power mainly, but better on Jupiter than 10x42 L when observation is difficult.
Spring has sprung.
10x42 L IS
Jupiter, a severe test of possible CA. Disc white or off white.
Fairly good transparency. No cloud seen after rainy day.
Binocular braced IS off.
Some CA just detectable centre field, but this could be atmospheric. Low elevation ~18 degrees.
30% away from centre to edge. Definite CA seen. Even maybe 20% from centre.
A bit more towards edge.
IS on. definitely more false colour, but still not objectionable. But I see it if I want to.
2 moons easy, possibly also moon 4, but very light polluted and not the clearest night. Jupiter low.
My pupils probably 5mm so limited by binocular exit pupil.
So, yes I can see CA if I want, but this is one of the best binoculars I have looked through.
Binoculars are two poor telescopes connected together.
The 18x50 IS shows much more CA because of higher power mainly, but better on Jupiter than 10x42 L when observation is difficult.