On 10/26/2011 1:49 PM, Toine wrote:
Today my O-GPS1 arrived and the sky cleared during sunset.
http://www.repiuk.nl/index.php/blog-mainmenu-97/199-astrotracer-first-try
Excellent!
It claims it can track star for 3 minutes at 200mm. The tracking at
200 mm isn't spot on maybe it needs more time to find more sats and or
I need to redo the advanced calibration.
I've been running into some of the same issues. I've been throwing all
of my sets into:
http://www.flickr.com/photos/ellarsee/collections/72157627826423347/
The last set has some rough comparisons of with and without astrotracing
(a couple showing stuff on the earth to get some idea how much it
actually moves).
It would be nice if there were a bit more precise adjustment of the
focal length. For general shake reduction, any sort of an improvement is
helpful, but for astrotracing you need it to be pretty close to spot on.
My SCWAG is that it compensates for about 90% of the movement.
I haven't tested to see if that 10% is not being accurate enough, or if
it's because the sensor only moves linearly. One way to test would be to
take shots with and without it aiming at various "latitudes": Polar,
equatorial, and some in between. It's possible that the best results
would be obtained with the camera pointing straight up, or due directly
west or east.
I also suspect that to get the best results will require photo stacking.
Like Larry mentioned before it's amazing what a modern dslr can do.
I suspect that for a bunch of people, this is going to be the killer app
that brings them to Pentax. I sincerely hope that they take this and
improve the software. I wish they'd just add a "tuning mode" that works
kind of like dust alert. You take a shot, it analyzes the resultant star
trails, and then corrects the following photos based on the results.
Toine
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Larry Colen [email protected] (from dos4est)
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