Assuming your dad is getting up in years, he would probably do better with the higher power. As people age their pupils don't open as wide as they did when they were young.
The size of the beam of light coming out of the eyepiece depends on the ratio of power to aperture in mm. A young person can use a ratio of about 7 to 1, but us older guys can only make use of about 4 to 1.
For example, 7x50 gives a ratio of about 7 to 1, good for a young person. But 7x35 (ratio of 5 to 1) is just as good for an older person because the extra light from the bigger lens can't get into the pupil.
So the 10x42 will probably appear just as light to you father as the 8x42, just more magnification. A younger person would see a brighter image with the 8x42. To get a brighter image he'd need something like a 12x60.
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Today's Featured Article - On the Road with Dave Gohl: Deere Departed Friend - by Dave Gohl. Have you ever had to part with a dear friend? It's not easy. If it's due to death, your feelings could be in disarray for days, months or even years. Even now after almost 4 years, I still miss my dad. I remember when I was a kid my dad sometimes would tuck my brother and I in at night and we would ask him questions about his childhood on the farm. To this day, it's some of the best stories I've ever heard. And now, I'm so glad that I asked those questions, and if I were a little smarter i
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