Orion with astrotracer miscalibration fix

Started Dec 10, 2017 | Discussions thread
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Polacofede Contributing Member • Posts: 944
Orion with astrotracer miscalibration fix

I have never ever been able to achieve precise calibration.

After some suggestions here by Chris Gunn and reading some similar things on pentaxforums I tried, just by trial an error, if i could compensate the miss readings by approaching different pieces of metal to the bump that holds the compass, it took me just a few minutes and test to find out how to hack it. I just needed to keep the metal bar in position when the camera started each exposure I guess that is the only time the camera measures its position and orientation.

It worked out so well that i could do 50s shots at 400mm of Orion! In previous attempts i was able to get 20s however the stars looked like rugby balls in the best cases. This time i was able to get rounded pin point stars.

i think the important part is the piece just over the camera and that does not surpass the body

Look at the crops.

with the compensating "device" , a bit out of focus

without the compensation

this is the result 20 frames 50secs each at 400mm f5.6 ISO800-640 . I suck editing.

I don't know what are those little spider legs on the stars. Maybe some kind of scratch in the lens?

So, I'm veeery happy! Now I need to figure out a better maybe semi-permanent way to compensate the tracker.

Look ma Orion!

Any ideas welcomed.

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