NDhunter
Experienced observer
has the EL x50 really better optics than the x42, will you see more with a50x than a x42 ? , the only reason for it to be better is that its maybe a little bit lighter in the evening for viewing ?
no, optic quality is of the same (very high) standard, so that you will notice absolutely no difference. if you are still quite young, then your pupils may dilate so much that can make use of the slightly bigger exit pupil diameter; if you are a bit older this may not be the case and consequently you will see pretty much the same even in low light conditions with both. but, honestly, how often do you go birding in low light?
There are some things that will certainly make a difference between the 10x42
SV and the 10x50. The main things are that the 10x50 is heavier, by around 6
oz. and fully equipped with strap, and eye covers, will be around 40 ounces.
The 10x50 has a FOV of 345 ft./1000 yds. and the 10x42 336, very close.
The 10x50 will be brighter, and will offer a easier view, these differences will be true when moving up the objective size, in comparing any like optics. As far as using
the bigger exit pupil, it is there for all to see, all day long, and especially useful
when light gets dim.
There is no right answer on which one is better, they both are great choices.
Personal choice is what is important.
Regards, Jerry