Quote:
Originally Posted by Cajundaddy
A Bridge deck will always have some lighting so eyes will never be fully dilated to take full advantage of the 7mm exit pupil with a 7x50.
|
Exit pupil is something that not many people consider, but it's the most important number for binoculars. Divide the two numbers (aperture/magnification) to get the exit pupil. Keep that around 5-7 for good all around binoculars that are easy to use and will look like windows instead of tubes. young eyes spending lots of time in darker environments, go more towards 7. Older eyes or mostly daytime, go for 4.
Also consider a set of polarized covers if you can find them. I was never on a ship, I don't know what is supplied, but if she doesn't have polarized sunglasses, then polarize the optics.