Re: Aerial Hyperstereo times?

[P3D <PTWW@xxxxxxx>]

> When taking hyper stereo images from a commercial jet plane, how long do
> you wait between images?  I have an opportunity to try coming up and have
> no idea what the different length between images should be.  1 second? 10
> seconds, 1 minute?  What has worked for you?

I started off trying a "one-one thousand,..." approach to hit my estimate
of a desired 2 second interval, for images taken from cruising altitude.
When I hit on the idea of more than two images, I wanted to try four
images two seconds apart each, for a total elapsed time of 6 "counted"
seconds (I know from experience my one-one thousand is not very accurate.)
For some reason, I found myself waiting more than two counted seconds
between the second and third images (completely unintentional)  So it
ended up being more like 2-3-2.  In my experience, by the time you get
close to 10 seconds the image has shifted too much to view comfortably in
a twin 2x2 viewer. I don't know if it would still work mounting your own
in a Realist format, though.  I tried to be a little quicker on shots from
lower altitude.  I think this would also depend on the focal length of the
lens.  (I looked at the formula posted recently, but haven't "learned" it
yet!)  My 28-85 is broken, so I only had my 70-210 to work with.  There is
also a discussion of timing for aerial hypers in the FAQ, I think.  I read
it after all my trips, though!

Good luck!  I'll be interested to hear your results!

Paul Talbot


------------------------------