Jason Bugay Reyes
Well-known member
So with the help of spotlight at nite and using 10x42 and 10x32 hand held for nocturnal wildlife, which one will resolve better details if the user is around 53 years old?
Even if I knew enough to take a shot at answering that, I wouldn’t.So with the help of spotlight at nite and using 10x42 and 10x32 hand held for nocturnal wildlife, which one will resolve better details if the user is around 53 years old?
The 10x42.....I'd be careful with that spotlight nocturnal wildlife will be running awaySo with the help of spotlight at nite and using 10x42 and 10x32 hand held for nocturnal wildlife, which one will resolve better details if the user is around 53 years old?
The range of movement is always the same. The pupil moves. It can be 3mm or 6mm in diameter. When it moves it moves regardless its diameter, something the Iris is responsible for.That is interesting. I didn't know that. What is the range of movement? Is that really as big as from 4.2 to 5mm and back, and than from 4.2 to 5mm again?
Regardless the size of the pupil, the pupil moves (the visible size of the pupil is decided by the Iris).Does that mean the pupil dilates and contracts or the pupil oscilates (as in nystagmus)?
Aaah ... your eyes must be different from mine. My pupils do not move when I look around while keeping my head still - my whole eye(ball) moves. I did not know that pupils could move independently from the rest of the eye. Learn something every day.Regardless the size of the pupil, the pupil moves (the visible size of the pupil is decided by the Iris).
Otherwise we should only see the object straight ahead of the view.
You're quite right. The eyeball moves (so the pupil moves). Sorry for the confusion. I'm just Dutch.Aaah ... your eyes must be different from mine. My pupils do not move when I look around while keeping my head still - my whole eye(ball) moves. I did not know that pupils could move independently from the rest of the eye. Learn something every day.
I think the image is not wrong, but it would mean that if you look at a point source, in those circumstances (same eye's pupil size, and exit pupil of 8 mag bino too big compared to the eye) the point source would look brighter in the 10x bino. Now an extended image, say you look at the wall, would look the same brightness in both binos because, although the 10x bino gathers more light, it also magnifies and stretches the image comapred to the 8x.View attachment 1573194
Thanks for all the answers! I received the book, but haven't read it yet. So maybe I will get some answers while reading it.
But for now I still don't understand it totally what is wrong with the assumption I made and visualised in this picture. Can somebody explain what is wrong? Although Jan van Daalen already made a comment that the size of the pupil changes constantly (but up to 5.25mm?). However, is that the only reason this theory is wrong?