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06-20-2016, 02:58 PM   #1
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Astrotracer

has any one given this a real work out yet any issue, best setting,tips etc .

or good picture to post or links to them

thanks

06-20-2016, 03:05 PM - 2 Likes   #2
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You'll want to calibrate the astrotracer once your GPS acquires a signal, the first time you use it and every time you change location.

The results should speak for themselves once calibration is completed correctly. If you still see star trails on a 30s exposure, continue calibrating (carefully, 180 degrees at a time along a single axis) until they vanish

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06-20-2016, 06:09 PM - 2 Likes   #3
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I have a K-30 and the o-gps1 unit but I suspect the K-1 astrotracer is pretty much the same. I've been using it for over two years now and really enjoy working with it with lenses from 16 to 105 mm when I can get from 40 s to over 3 min worth of precise tracking. I've had success with the 200 mm at 30-40 s. My 400mm won't give me more than 10 s. (It's hard to calibrate with such a lens!). Some have reported much longer tracking though. As Adam pointed precise calibration is key, especially with 100 mm +. Here's a link to the official Pentax calibration page. The footnotes are very interesting. You can browse the o-gps1 flickr group for some examples. Here are a couple of mine.


10 X 40 s iso 800 with a Sigma 105 mm f/2.8



Pano of five images, 2 min exposure each with a M28/2.8 lens

Clear skies!
06-21-2016, 02:46 AM   #4
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Thanks for the tips

Sunvalley that second image is exactly what i'm hoping create it's lovely i,m off to greece in a few weeks so should have so nice sky to look at

06-21-2016, 04:44 AM   #5
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Thanks! Have fun in Greece.
06-21-2016, 05:34 AM   #6
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Also off to Greece in a few weeks looking foreward to using astrotracer while i'm there
06-21-2016, 12:34 PM   #7
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Thanks for that link, I have been rotating the camera though 360 following the arrows, the instructions were vague at best, the video in the link makes it much clearer....
06-25-2016, 07:43 AM   #8
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Astrophotography with the K1. I think I may be missing something

I think I may be missing something or maybe the camera cant really correct in two axis. It did correct for the rotation of the earth but not for the orbit of the earth around the sun. I cropped the picture to more clearly show the movement in the stars.


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