kwkeirstead
Well-known member
After months of suspecting I have a problem with my AG-AC160A, I finally made some careful measurements.
Here below is a comparison of measured distances to an object (black and white bulls-eye) compared to the distance reported by the camera.
Conclusion: My camera overstates distance by as much as 5 meters, the variance is non-linear.
test conditions:
red focus assist
daylight wb
Z86 (full zoom)
Iris 4.8
ND 1/4
0 db
spot meter ON
measurement device: surveyor's 200 ft tape measure
Camera Actual Diff
25 m 25 m 0
23 m 21 m +2
21 m 17 m +4
18 m 13 m +5
12 m 09 m +3
5.8 m 05 m +1
I used to have a laser mounted on the camera so that I could get the camera set up for stage events (3 measures - front stage, mid stage and back stage), I figured this would be a good way to quickly make adjustments as the actors would consolidate at various parts of the stage. My distance from the front the stage was typically 53 feet, but in some venues 100 ft.
I stopped using the laser after I discovered that the in-camera distance meter was off.
I suppose some of you might say, why care about the distance, just use peaking.
I wonder if anyone would care to repeat this test, if you find the distance meter to be accurate, then I will need to take the camera in for warranty service.
Here below is a comparison of measured distances to an object (black and white bulls-eye) compared to the distance reported by the camera.
Conclusion: My camera overstates distance by as much as 5 meters, the variance is non-linear.
test conditions:
red focus assist
daylight wb
Z86 (full zoom)
Iris 4.8
ND 1/4
0 db
spot meter ON
measurement device: surveyor's 200 ft tape measure
Camera Actual Diff
25 m 25 m 0
23 m 21 m +2
21 m 17 m +4
18 m 13 m +5
12 m 09 m +3
5.8 m 05 m +1
I used to have a laser mounted on the camera so that I could get the camera set up for stage events (3 measures - front stage, mid stage and back stage), I figured this would be a good way to quickly make adjustments as the actors would consolidate at various parts of the stage. My distance from the front the stage was typically 53 feet, but in some venues 100 ft.
I stopped using the laser after I discovered that the in-camera distance meter was off.
I suppose some of you might say, why care about the distance, just use peaking.
I wonder if anyone would care to repeat this test, if you find the distance meter to be accurate, then I will need to take the camera in for warranty service.