dgdg wrote:
You need a tracker then to lower your ISO!
David
Yes and no... I shot several 3 minute exposures at ISO 1600 to capture my foreground. On my 6D these would have been very clean. The first one on the 5DSR was OK (still noisy but manageable). Subsequent long exposures really started looking bad. Lots of luminance noise and some of the red streaks that Ben referred to. I'll post one of those when I get home tonight.
With that in mind, I think you may be better off with the 5DSR taking short, higher ISO astro images with LENR turned on and give yourself some time between shots. If I'm going to track (and I plan to this weekend) I'll probably use my 6D,
kylebarendrick wrote:
Yes and no... I shot several 3 minute exposures at ISO 1600 to capture my foreground. On my 6D these would have been very clean. The first one on the 5DSR was OK (still noisy but manageable). Subsequent long exposures really started looking bad. Lots of luminance noise and some of the red streaks that Ben referred to. I'll post one of those when I get home tonight.
With that in mind, I think you may be better off with the 5DSR taking short, higher ISO astro images with LENR turned on and give yourself some time between shots. If I'm going to track (and I plan to this weekend) I'll probably use my 6D,...Show more →
Aha, sensor heat may be the culprit. I will look and see if my earlier images are cleaner. The astro conversion guys add a heat sink to the sensor.
kylebarendrick wrote:
Yes and no... I shot several 3 minute exposures at ISO 1600 to capture my foreground. On my 6D these would have been very clean. The first one on the 5DSR was OK (still noisy but manageable). Subsequent long exposures really started looking bad. Lots of luminance noise and some of the red streaks that Ben referred to. I'll post one of those when I get home tonight.
With that in mind, I think you may be better off with the 5DSR taking short, higher ISO astro images with LENR turned on and give yourself some time between shots. If I'm going to track (and I plan to this weekend) I'll probably use my 6D,...Show more →
I have found LENR to do nothing but double the noise in the 5DS R at higher ISO and shorter exposures (less than a few minutes). I would not recommend using LENR for exposures under a minute under any circumstances. Doing more tests to sort this out...
alundeb wrote:
I have found LENR to do nothing but double the noise in the 5DS R at higher ISO and shorter exposures (less than a few minutes). I would not recommend using LENR for exposures under a minute under any circumstances. Doing more tests to sort this out...
Good info, thanks! I may try it once or twice for shots over 3 minutes just to test. I want to see if I can get a clean image at ISO 800 with or without LENR.
kylebarendrick wrote:
Yes and no... I shot several 3 minute exposures at ISO 1600 to capture my foreground. On my 6D these would have been very clean. The first one on the 5DSR was OK (still noisy but manageable). Subsequent long exposures really started looking bad. Lots of luminance noise and some of the red streaks that Ben referred to. I'll post one of those when I get home tonight.
With that in mind, I think you may be better off with the 5DSR taking short, higher ISO astro images with LENR turned on and give yourself some time between shots. If I'm going to track (and I plan to this weekend) I'll probably use my 6D,...Show more →
That's a shame. I have my 5D3 and A7R, but was hoping to use the 5DS for some milky way shots.
kylebarendrick wrote:
With that in mind, I think you may be better off with the 5DSR taking short, higher ISO astro images with LENR turned on and give yourself some time between shots. If I'm going to track (and I plan to this weekend) I'll probably use my 6D,
Or try cooling the camera? Strap a frozen gel pack to the back?
Glad this discussion addressed longer exposures, as I haven't yet had the opportunity to test this aspect yet. With previous cameras I was never a fan of long exposure noise reduction, but then again I haven't been a fan of any noise reduction at all, as I can always see the artifacts between areas reduced and those left alone...
Monito wrote:
Or try cooling the camera? Strap a frozen gel pack to the back?
Not sure how much it would transfer the heat but a good idea. If you go to Gary Honis's website, you will see people making small active (powered) coolers that completely enclose the camera to reduce noise. Usually it's a thing for CCD cameras on the big telescopes.
If its a step back from the 6D or 5D3, that would be disappointing. Lately for long night exposures I use my A7R, with my 5D3 as the backup body. Both work very well.
I checked my shots and saw that I took a couple before it was completely dark, then after 45 minutes a set of three within 2-3 minutes. The last has more red. But the sequence was 3200, 4000 6400 so it could have just been the higher ISO. Generally speaking I preferred the ISO3200 shots from this session. I used LENR for all of them
It was fairly warm for my shots, about 70 at sea level. I'll see how things go this weekend in cooler conditions in the mountains. Hopefully I can draw a different conclusion.
kylebarendrick wrote:
Good info, thanks! I may try it once or twice for shots over 3 minutes just to test. I want to see if I can get a clean image at ISO 800 with or without LENR.
Ah, that's interesting. I didn't notice it before. So my experience the other night at ISO 1600 at 2 and 3 minutes falls between your tests at 1 and 4 minutes - and the results seem to lie in between as well.
