More IR Astrophotography
Aug 27, 2015 01:59:51 #
The moon was really bright again tonight, and I thought I would do another experiment in IR, this time using a 590nm IR filter on a Sony A55 that has been modified to be a full frame camera. Used a Minolta 100mm F2.8 lens @ F2.8 and ISO 1600.
I aimed about 70 degrees away from the moon. I did find I could shoot Altair which was close to the moon, but it was suffering, so I aimed farther away. This shot is actually a bit to the north side of Vega.
I will present 3 images.
1) A shot without the 590nm IR filter. You can tell it is just a bit out of focus. I did this shot after taking the other shots and I find that the focus point changes ever so slightly when the filter comes off and I didn't refocus. This is 15 sec at ISO 1600 and you can see how washed out it is. You can thank the moon for that.
2) An unprocessed shot using the 590nm IR filter.
3) The process result. Took 8 of these plus 3 darks and processed through DSS, then Lightroom, then DXO Optics, then StarTools and back to Lightroom.
I aimed about 70 degrees away from the moon. I did find I could shoot Altair which was close to the moon, but it was suffering, so I aimed farther away. This shot is actually a bit to the north side of Vega.
I will present 3 images.
1) A shot without the 590nm IR filter. You can tell it is just a bit out of focus. I did this shot after taking the other shots and I find that the focus point changes ever so slightly when the filter comes off and I didn't refocus. This is 15 sec at ISO 1600 and you can see how washed out it is. You can thank the moon for that.
2) An unprocessed shot using the 590nm IR filter.
3) The process result. Took 8 of these plus 3 darks and processed through DSS, then Lightroom, then DXO Optics, then StarTools and back to Lightroom.
no IR filter
(Download)
unprocessed shot with IR filter and converted to B&W
(Download)
Stacked, then processed
(Download)
Aug 27, 2015 09:03:15 #
Just noticed I had said the Sony had been modified to be a "full frame" camera. Not true. Modified to be "full spectrum". Quite a difference in meaning in that slip up.
Sorry
Sorry
Aug 27, 2015 17:08:12 #
JimH123 wrote:
The moon was really bright again tonight, and I th... (show quote)
Very fine work Jim H. I'll keep this process in mind.
Craig
Aug 28, 2015 00:59:05 #
Wasn't so good out there tonight. A very thin layer of clouds. Here is the IR showing the clouds more distinctly. I only kept it because the wispy cloud fascinated me. Other than that, a dud of a trip outside tonight.
Wispy clouds tonight
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