- #1
airkapp
- 58
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A human eyeball is about 2 cm long and the pupil has a maximum diameter of about 5 mm. What is the speed of this lens?
f-stop = 2 cm / .5 cm
f-stop = 4
is this it?
I'm not sure if I found the right formula in my book
thanks
f-stop = 2 cm / .5 cm
f-stop = 4
is this it?
I'm not sure if I found the right formula in my book
thanks