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Re: [jt512] More Alien Test Results (Lots of pics, very bandwidth intensive):
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cracklover
Jun 16, 2009, 8:30 PM
Views: 9518
Registered: Nov 14, 2002
Posts: 10162
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How much does camera angle and camera centering affect the measurement?
I believe Aric addressed this in an earlier post on the misdrilled axle holes thread.
The gyst of it is that with enough angle you can get the central point to move around relative to the middle of the axle of course, because the axle is closer to the camera. With that said, I've not had the level of difficulty you have in getting the axle centered.
If (1) is important, then how good has the centering and angle been in the photographs used?
Certainly a valid question. I'll say this for my photos - whatever technique I've used has been good enough so that all the photos I've taken of my non-CCH cams has shown the center point to line up consistently, and all the repeat photos I've taken of the same cam has given me the same results.
How much does manual selection of the sampled points bias the measurements or affect their reliability?
Don't know.
Do repeated photographs and selection of sample points on the same unit produce consistent results?
For me, yes.
In a systematic comparison, how would results for Aliens and other brands compare?
Unfortunately (for many reasons) I don't have many other small cams at my disposal at the moment. Using the software on larger cams isn't really a fair comparison, since if they're off by a mm or two, you'd hardly notice, and the affect on the effective cam angle would be negligible.
GO
(This post was edited by cracklover on Jun 16, 2009, 8:31 PM)
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Edit Log:
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Post edited by cracklover
() on Jun 16, 2009, 8:31 PM
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