Kevin Morefield:
John Hayes:
Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
F3 DeltaRho: 120 Luminance, 300 RGB, 600 NB
F3 FSQ106: 300 LRGB, 600 NB
Same here Kevin!
Well I stole it from you! Hahaha! Right...good move.
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The setting I use are -
QHY600
BB mode 3, Gain 0, offset 30
NB mode 1, Gain 56, offset 30
QHY268
BB mode 4, Gain 0, offset 50
NB mode 5, Gain 56, offset 50
thanks. Mind sharing the exposure length as well ?
Both cameras go on an f5.3 system and I normally run the 600MM at BB 60" and NB 300". The 268MC is generally run at BB 120" and NB 300". Much longer and I tend to risk flooding the wells.
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Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
F3 DeltaRho: 120 Luminance, 300 RGB, 600 NB
F3 FSQ106: 300 LRGB, 600 NB Kevin, What led you to settle on the extended full well mode 2CMS? Was it the greater well depth for shooting at F3? I started using the 268 about 3 years ago. At the time, it seemed that high gain mode, gain 56 for NB and gain 0 for BB was the most commonly used mode/gain settings. Since settling on these settings, I haven't paid much attention to the other modes and the subsequent new modes. Looking at QHY's graphs, it looks like the 2 biggest things that stand out between extended full well 2CMS mode (gain 25) and high gain mode (gain 56) are: 1. 2.8 times the well depth (80k vs. 28.5k) 2. 3.7 more readout noise (~5.5 vs. ~1.5) Is the increase in readout noise even a concern if you're piling up dozens of hours on an image? I've recently moved my TOA130 and 1100GTO-AE to a remote observatory, and I'm looking to make any mode/gain changes that are better suited for the dark skies. My only change so far has been to increase my Ha exposures from 5 min to 20 min.  |
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John Hayes:
Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
F3 DeltaRho: 120 Luminance, 300 RGB, 600 NB
F3 FSQ106: 300 LRGB, 600 NB
Same here Kevin! John, Are you using Mode 3 with your refractors as well as your ASA 600?
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I'm using:
-Expanded full well 2CMS for broadband at gain 0 and take 5min exposures.
-High Gain mode for narrowband at gain 56 and take 10m exposures.
Those are the only two settings I use.
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Shannon Foye:
John Hayes:
Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
F3 DeltaRho: 120 Luminance, 300 RGB, 600 NB
F3 FSQ106: 300 LRGB, 600 NB
Same here Kevin!
John,
Are you using Mode 3 with your refractors as well as your ASA 600? My ASA600 has a Moravian camera on it. I use Mode 3, gain 25, with an offset on the QHY600MM on my refractor. That setting on the QHY provides a large dynamic range with read noise about half of a 16803. It is an excellent choice for both NB and broadband imaging and I would use the same settings on the Moravian if they offered it. John
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John Hayes:
Shannon Foye:
John Hayes:
Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
F3 DeltaRho: 120 Luminance, 300 RGB, 600 NB
F3 FSQ106: 300 LRGB, 600 NB
Same here Kevin!
John,
Are you using Mode 3 with your refractors as well as your ASA 600?
My ASA600 has a Moravian camera on it. I use Mode 3, gain 25, with an offset on the QHY600MM on my refractor. That setting on the QHY provides a large dynamic range with read noise about half of a 16803. It is an excellent choice for both NB and broadband imaging and I would use the same settings on the Moravian if they offered it.
John Thanks John. I’m going to start using Mode 3
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Shannon Foye:
Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
F3 DeltaRho: 120 Luminance, 300 RGB, 600 NB
F3 FSQ106: 300 LRGB, 600 NB
Kevin,
What led you to settle on the extended full well mode 2CMS? Was it the greater well depth for shooting at F3?
I started using the 268 about 3 years ago. At the time, it seemed that high gain mode, gain 56 for NB and gain 0 for BB was the most commonly used mode/gain settings. Since settling on these settings, I haven't paid much attention to the other modes and the subsequent new modes.
Looking at QHY's graphs, it looks like the 2 biggest things that stand out between extended full well 2CMS mode (gain 25) and high gain mode (gain 56) are:
1. 2.8 times the well depth (80k vs. 28.5k)
2. 3.7 more readout noise (~5.5 vs. ~1.5)
Is the increase in readout noise even a concern if you're piling up dozens of hours on an image?
I've recently moved my TOA130 and 1100GTO-AE to a remote observatory, and I'm looking to make any mode/gain changes that are better suited for the dark skies. My only change so far has been to increase my Ha exposures from 5 min to 20 min.
I originally used the high gain mode when I first got the QHY600. My goal was to maximize dynamic range. But I had a lot of issues with horizontal dark bands emanating from the saturated cores of bright stars. I switched to the extended full well to minimize these dark bands. This is mostly worked. Only extremely bright stars exhibit that banding now. The trade of was read noise. But I also was able to lengthen the exposure times which means fewer total subs and thus fewer reads. It also means less storage required, which is nice. Rather the get too pedantic about these decisions (remember you don't even have these choices with other manufacturers), I picked this and stuck with it. That meant using the same settings on my DeltaRho when that came along. Of course, this high full well settings are better suited to F3 than F7 anyway. Looking at these most recent charts and the new HighGain 2CMS I might try that mode with Gain 57 and see how it works out. But that would cut my full well down considerably. Kevin
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@John Hayes and @Kevin Morefield it's interesting to hear that both you guys are using 2CMS for both broadband and narrowband. I'll have to give that a try. Nothing like simplifying things, and this gives the ability to shoot broadband and narrowband on the same night (automated).
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Kevin Morefield:
I switched to the extended full well to minimize these dark bands. When you switched modes, did you need to change the USB speed setting?
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Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters. Looking at those latest charts, wouldnt you want gain 26? it looks like that is where read noise takes a nosedive. We are spoiled indeed with these BSI sony chips...
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Chris White- Overcast Observatory:
and this gives the ability to shoot broadband and narrowband on the same night (automated). Chris, Do you use NINA? I see that changing readout modes is available in the Advanced Sequencer but I'm still in the process of re-learning how to use the Advanced Sequencer. I have not tried that function yet.  |
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Shannon Foye:
Chris White- Overcast Observatory:
and this gives the ability to shoot broadband and narrowband on the same night (automated).
Chris,
Do you use NINA? I see that changing readout modes is available in the Advanced Sequencer but I'm still in the process of re-learning how to use the Advanced Sequencer. I have not tried that function yet.
I'm using voyager. ill have to look to see if i can do this in dragscript. I do like the idea of just one setting though. Lol
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Chris White- Overcast Observatory:
Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
Looking at those latest charts, wouldnt you want gain 26? it looks like that is where read noise takes a nosedive.
We are spoiled indeed with these BSI sony chips... I’m looking at Mode 5 which I think has a gain 56 cutoff.
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Shannon Foye:
Kevin Morefield:
I switched to the extended full well to minimize these dark bands.
When you switched modes, did you need to change the USB speed setting? I tested USB speeds extensively but didn’t come to any real conclusions. I’ve been using USB speed zero for a while now.
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Kevin Morefield:
Chris White- Overcast Observatory:
Kevin Morefield:
Mode 3, Gain 25, Offset 20. I use that for all filters.
Looking at those latest charts, wouldnt you want gain 26? it looks like that is where read noise takes a nosedive.
We are spoiled indeed with these BSI sony chips...
I’m looking at Mode 5 which I think has a gain 56 cutoff. My bad, I got the modes confused. Too many to choose from and the names are similar.
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Chris White- Overcast Observatory:
Looking at those latest charts, wouldnt you want gain 26? it looks like that is where read noise takes a nosedive. Chris, The read noise in mode 3 is almost constant between gain values of 25 and 26. The reason that I use gain 25 is that's unity gain in mode 3. Using a gain other than one either reduces the well depth or sensitivity. Well depth is very important if you want to preserve star colors. And you are correct that this single setting works well for both broad and narrow band, which simplifies everything about using all of the filters at your disposal. John
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2CMS-1 (mode 9)
Lum: Gain 0 Offset 16
Other: Gain 56 Offset 16
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