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The Antares region, including M4, Rho Ophiuchi, and IC4604. About 1 hour each of LRGB, shot with a QSI583 through a Tamron 80-200mm zoom lens at 200mm. The very observant viewer will note some geometric distortion, which I applied to reduce the field curvature.

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Comment by Greg Marshall on June 16, 2013 at 7:42pm

Thanks, Trevor. Well, first I had to make the adapter! ;-) Yes, processing was tricky - partly because of the low elevation, but also to reduce aberrations (CA and field curvature). Gradient Exterminator for the former and Photoshop Lens Correction for the latter. Our buddy, Neil Heacock, has a similar shot done with a Canon lens, but he shot it wide open to avoid the diffraction spikes. My lens definitely would not have worked that well wide open.

Comment by Trevor Woodrow on June 16, 2013 at 7:13pm

Fantastic Greg. Just hooked the camera lens to eth QSI? Well done. How was the processing? Hard as it looks?

Comment by Greg Marshall on June 16, 2013 at 4:24pm

Thanks, guys!

Comment by Jeffrey P Nunnari on June 16, 2013 at 8:45am


Comment by Greg Marshall on June 16, 2013 at 8:03am

Thanks, Trevor. It is a wonderful target - difficult to shoot here because it never gets above 20 degrees elevation, but beautiful.

Comment by Trevor Jones on June 16, 2013 at 6:42am

Stunning work Greg! Love this area

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