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Astrophotography with 6D vs 5D mark IV
  
 
RobDickinson
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p.2 #1 · p.2 #1 · Astrophotography with 6D vs 5D mark IV


conyon wrote:
5dsr not good for astro, why is that?


Because the noise level is hideous. as bad as a crop camera really. Canon have optimised it for low ISO resolution



Mar 18, 2017 at 10:22 PM
kirbic
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p.2 #2 · p.2 #2 · Astrophotography with 6D vs 5D mark IV


dgdg wrote:
How do you like the ioptron Pro?
Have you done anything longer than 2 min?


There are a lot of things to like about the iOptron Pro. As far as features per dollar, it is hard to beat. It doesn't take up a lot of room in the luggage, so it is a solution that I can take on vacation with me, and that is a *huge* win. I do suspect that I need to do some collimation of the polar scope. I'll experiment some more when we get some warmer weather and clearer skies.
I've done some exposures up to 4 minutes with good results. I've also used focal lengths up to 100mm, at which point alignment is pretty darn critical, and had mixed results, but I don't think it was the unit's fault :-)
I love the built-in rechargeable battery.
In general, I don't think that individual exposures of more than 2 minutes are really required often; more often than not, the sky background will be above the noise floor at 2 minutes, often shorter.




Mar 18, 2017 at 10:55 PM
dgdg
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p.2 #3 · p.2 #3 · Astrophotography with 6D vs 5D mark IV


Very cool. I wish Ian at lonely spec would review it.
You could get the qhy polemaster, but you would need a little Windows tablet to run the software. At least then you could see how far off the ioptron scope is. I didn't think you could collimate those scopes.

In dark skies at f2.8 I usually hit the proper histogram peak around 4 minutes. If I could use the ioptron pro for four minutes at 35mm or less with sharp round stars that'd be nice. I went with an Astrotrac several years ago but I'd like something small for those times when I'm not planning on Astro.



Mar 18, 2017 at 11:53 PM
Isaacheus
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p.2 #4 · p.2 #4 · Astrophotography with 6D vs 5D mark IV


dgdg wrote:
Issac,
For timelpase do you have time to switch out batteries and keep it going? Not having done any, I had assumed the switch out would cause a weird jump in the movie. I do find the tether tool battery setup convenient. It's one less thing to check.

I never had any dew at Arches NP. On the east coast, I'm just happy if a low ground fog layer never forms below the clear skies. Dew straps are pretty essential for me. If the death valley dew point is way below the predicted low temp, you'd prob be fine without one. They
...Show more

I've tried once; or at least, a lens swap (10 seconds isn't enough, but 15 is getting better), battery swap would be faster than that, but haven't had to really. Was just experimenting with them really, ideally the batter will last, and no one should ever need to do a lens swap

Ming, In terms of hand warmers, I've tried a few times, with various success, tin foil wrapped around the lens with an adhesive hand warmer inside seems to work, but really need to get a proper dew heater for longer/more regular attempts

An example of when I don't have anything to keep the lens clear: (Am I allowed to link like this?)
https://gfycat.com/SimilarForsakenArcticseal



Mar 19, 2017 at 01:33 AM
kirbic
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p.2 #5 · p.2 #5 · Astrophotography with 6D vs 5D mark IV


dgdg wrote:
Very cool. I wish Ian at lonely spec would review it.
You could get the qhy polemaster, but you would need a little Windows tablet to run the software. At least then you could see how far off the ioptron scope is. I didn't think you could collimate those scopes.

In dark skies at f2.8 I usually hit the proper histogram peak around 4 minutes. If I could use the ioptron pro for four minutes at 35mm or less with sharp round stars that'd be nice. I went with an Astrotrac several years ago but I'd like something small for
...Show more

I think 4 minutes at those FLs is very doable. May require a little trial and error in fine adjustment of the alignment to nail it, but not that much of a challenge.
I've always really liked the Astrotrac, and would have bought one instead but the iOptron seemed adequate for WA, and it is very compact.




Mar 19, 2017 at 02:17 AM
Jeff
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p.2 #6 · p.2 #6 · Astrophotography with 6D vs 5D mark IV


conyon wrote:
5dsr not good for astro, why is that?

RobDickinson wrote:
Because the noise level is hideous. as bad as a crop camera really. Canon have optimised it for low ISO resolution


Do you have any examples? And, does your assertion apply to same-sized prints (even though I realize the 5Ds was brought up for its increased resolution)?

7DII is postulated at Clarkvision as having some of the best astrophotography characteristics of any Canon sensor, and the pixel size is virtually the same as the 5Ds. Wish Roger would look at the 5Ds.



Mar 21, 2017 at 05:12 AM
 

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drobertfranz
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p.2 #7 · p.2 #7 · Astrophotography with 6D vs 5D mark IV


Jeff wrote:
Do you have any examples? And, does your assertion apply to same-sized prints (even though I realize the 5Ds was brought up for its increased resolution)?

7DII is postulated at Clarkvision as having some of the best astrophotography characteristics of any Canon sensor, and the pixel size is virtually the same as the 5Ds. Wish Roger would look at the 5Ds.


I used the 5dsr last summer for some astro (milky way) photography and had fine results with it. I have a gorgeous 20 x30" print on metal hanging in my living room.. No visible noise. The noise isn't quite as well controlled as my 1DX but it's close. It's easily as good if not a bit better than my 5d3. I'll show a 5dsr image shot at ISO 6400 30 seconds at F2 with a 35mm F1.4 lens. Processed in DPP with no sharpening or NR.






Full image

  Canon EOS 5DS R    0mm    f/0.0    13s    6400 ISO    0.0 EV  







viewed at 100% upper right corner

  Canon EOS 5DS R    0mm    f/0.0    13s    6400 ISO    0.0 EV  



Edited on Mar 21, 2017 at 08:09 PM · View previous versions



Mar 21, 2017 at 05:20 PM
kylebarendrick
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p.2 #8 · p.2 #8 · Astrophotography with 6D vs 5D mark IV


My experience with the 5DSR for astro led me to conclude that it rendered the sky and stars really nicely - just as you've shown above. However, when I've tried to pull detail out of the land, I've seen a lot of noise and color banding in the shadows. Your shot is helped by the fact that you left the ground as a silhouette.


Mar 21, 2017 at 05:40 PM
drobertfranz
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p.2 #9 · p.2 #9 · Astrophotography with 6D vs 5D mark IV


kylebarendrick wrote:
My experience with the 5DSR for astro led me to conclude that it rendered the sky and stars really nicely - just as you've shown above. However, when I've tried to pull detail out of the land, I've seen a lot of noise and color banding in the shadows. Your shot is helped by the fact that you left the ground as a silhouette.


I've done that also and 5dsr is no worse than the 5d3 I used prior, and not far behind the 1dx.. In fact the 20 x 30" print I referenced is such an image and FG looks fine.I stand by my findings.



Mar 21, 2017 at 05:51 PM
kylebarendrick
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p.2 #10 · p.2 #10 · Astrophotography with 6D vs 5D mark IV


Fair enough - I've had good days (I guess nights actually) and bad with my 5DSR, to the point where I trust my 6D more.


Mar 21, 2017 at 06:23 PM
drobertfranz
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p.2 #11 · p.2 #11 · Astrophotography with 6D vs 5D mark IV


kylebarendrick wrote:
Fair enough - I've had good days (I guess nights actually) and bad with my 5DSR, to the point where I trust my 6D more.


Yes 6d is very good for night photography. I was just responding to the the premise that the 5dsr can't do night photography.. That is not my experience at all.




Mar 21, 2017 at 07:26 PM
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