Friday 24 May 2013

Gopro HERO3 Characteristics

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.

No comments:

Post a Comment