EXIF
Make = GoPro
Model = Hero3-Black Edition
Focal Length = 2.77mm
Exposure = 1/xx sec at ƒ/2.8
Focus Distance
It's a bit tough to figure out the center-of-focus distance with no filters attached, so I used various close-up filters, and calculated the no-filter focus distance from those.
Answer: 35"
Specific results:
- +1 filter (+1 diopter) - hard to tell -- long.
- +2 = roughly 16". Pretty sharp at 24"
- +4 = 8.5". Quite sharp from 6" to 10", and not bad 5" to 12".
- +10 = 5". Quite sharp 4" to 6", and not too horrible 2" to 10"
I used the +4 result of 8.5", or 22cm. If +4 is 22cm, +0 is 22*4=88cm. So the focus distance with a +0 filter (i.e. no filter) ought to be 88cm, or about 35".
I shot the test photos in pretty low light conditions, so they're somewhat noisy. I might re-try in better light some day.
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