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Old 23-05-2017, 03:34 PM
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OzEclipse (Joe Cali)
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Scorpius and Rho

Faced with a nice sky on a dark clear night but feeling tired after a poor previous night sleep and not wanting to set up a tracking mount, I decided to try using Astrotrace to take some shots from a fixed tripod. Astrotrace uses the camera GPS to tell the camera where it is pointing and where it is geographically located. The camera processor then uses small movements of the image stabilizer, to shift the sensor to minimize the effects of the Earths rotation visible in the sky. No system like this can rotate the image perfectly around the celestial poles. It simply minimizes movement across the whole frame. In the attached image, you can just see some movement at the lower right corner of the frame but the rest of the image is not bad. in the larger version, the trailing lower right is easier to make out.

Larger version top of this page :
http://joe-cali.com/astronomy/astrophotography-2/


Joe
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Last edited by OzEclipse; 23-05-2017 at 03:45 PM.
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Old 23-05-2017, 04:03 PM
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multiweb (Marc)
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That's a great widefield. That's the area I'd like to image at the SPSP.
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Old 23-05-2017, 05:18 PM
Mickoid (Michael)
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Great shot, a very clever feature. Not perfect but without it you would have got severe star trailing at 2 mins exposure. Is your camera modified? It appears to have good sensitivity to Ha. I have the same lens in M42 mount but can't use it on my Canon as it won't focus to infinity with the adapter. I have an older Pentax istdl I can use it on but it's only a 6 MP sensor.
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Old 23-05-2017, 07:53 PM
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OzEclipse (Joe Cali)
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Marc,
Thanks for your comment. Look forward to seeing your image from Astrofest.

Michael,

All my cameras are unmodded. However all image are reprocessed to show up emission neb as are most photos published on this forum.

Canon sell a 50mm f1.8 that many refer to as the nifty fifty. It is very cheap ~ A$115 and optically excellent as are most 50mm primes. It is the easiest lens to design.

I have never modded any camera. I use them more for terrestrial photography than astro and I teach photography courses at a photography art centre. I need to have cameras with a normal colour balance when doing demos. I demo with live view straight to a big screen monitor in the teaching room.

I have never owned an *ist D. I saw some half decent m31 images taken with it but I don't think it had Ha sensitivity. My K10D certainly didn't. But you may as well try your *ist D and see.

My K5 has some red sensitivity and the K1 seems reasonable. There are some colour shifts eg. purple stars at high ISO's. Noise is well controlled and the darks are incredible.

In fact I have low light noise reduction turned off and I processed the image quickly and didn't apply any darks to the posted image.

cheers

Joe
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Old 23-05-2017, 09:19 PM
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Retrograde (Pete)
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Really nice Joe - you've picked up the Prawn, Cats Paw & Lobster nebulae really well in addition to the Rho region.

Nice to see an astrotracer shot too
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Old 24-05-2017, 12:04 AM
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LostInSp_ce
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Very nice.
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Old 24-05-2017, 07:50 AM
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Atmos (Colin)
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That feature certainly does a good job, the stars speak for themselves.
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Old 24-06-2017, 06:12 PM
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astronobob (Bob)
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Very very good Joe
Just the single exposure I take it
Great Camera
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