1st Dec Full Disk
- minhlead
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1st Dec Full Disk
I think I improved a bit on sharpness by increasing the gain and lower exposure time. Was 1.8ms and have quite a lot of blurriness across the disk. Now I am exposing for about 0.4 ms and the result look much sharper.
Minh.
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- Montana
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Re: 1st Dec Full Disk
Oh yes!! very very nice indeed it looks a bit more on band today also
Alexandra
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Re: 1st Dec Full Disk
That shorter exposure is much better.
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- minhlead
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Re: 1st Dec Full Disk
Yeah. The last few days I did not turn on the cooler. Thought I do not need it since it's winter and ambient temperature is around 20*C. But apparently my Quark still requires the cooler to be onband.
Minh.
Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
- minhlead
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Re: 1st Dec Full Disk
Yeap. Did not expect such a big improvement. I have never ever thought 2ms exposure is still too long. I used to shoot planetary and anything under 5ms is more than enough to beat the seeing. Apparently solar need much shorter exposure time.
Minh.
Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
Loves from Viet Nam <3
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Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
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- Rusted
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Re: 1st Dec Full Disk
Interesting. My own exposures are around 10ms at this time of year. [Weather permitting.]
Opinions seem to vary widely on whether this is short enough to beat the seeing.
I used to try and get exposures as short as possible even at the cost of increased gain.
The Lunt B1200S2 is very dim compared with the PST BF5. I now only use the latter on proms.
Congratulations on your SPOD.
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
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Re: 1st Dec Full Disk
I am surprised too. But some gain is not a bad thing. A right amount of gain would induce some random noise which in turn will increase bitdepth of the stacked image.Rusted wrote: ↑Wed Dec 01, 2021 4:07 pmInteresting. My own exposures are around 10ms at this time of year. [Weather permitting.]
Opinions seem to vary widely on whether this is short enough to beat the seeing.
I used to try and get exposures as short as possible even at the cost of increased gain.
The Lunt B1200S2 is very dim compared with the PST BF5. I now only use the latter on proms.
Congratulations on your SPOD.
https://www.stark-labs.com/craig/resour ... acking.pdf
If you have the time, read this. A very compelling read on the impact of stacking on bitdepth.
Minh.
Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
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Re: 1st Dec Full Disk
I misread his original exposures, because I am typically between 2 - 10 ms so you are right, the change shouldn't have made that big of an improvement so I wonder if it was a change in seeing instead.Rusted wrote: ↑Wed Dec 01, 2021 4:07 pmInteresting. My own exposures are around 10ms at this time of year. [Weather permitting.]
Opinions seem to vary widely on whether this is short enough to beat the seeing.
I used to try and get exposures as short as possible even at the cost of increased gain.
The Lunt B1200S2 is very dim compared with the PST BF5. I now only use the latter on proms.
Congratulations on your SPOD.
Warren
Lunt LS60T DS
Orion ED80T CF
Meade ETX LS6
Lunt CaK BF1200
Lunt WL Wedge
Baader Photographic Film
ASI174MM
Skyris 236M
Player One Saturn-M SQR
https://www.astrobin.com/users/rigel123/
Lunt LS60T DS
Orion ED80T CF
Meade ETX LS6
Lunt CaK BF1200
Lunt WL Wedge
Baader Photographic Film
ASI174MM
Skyris 236M
Player One Saturn-M SQR
https://www.astrobin.com/users/rigel123/
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Re: 1st Dec Full Disk
Very nice!! It just needs to be rotated.
JP
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Re: 1st Dec Full Disk
Ha ha. I agree.
I switched several time between exposure time and the result is the same. Shorter exposure always sharper.
Thanks Terry. I am honored.
Minh.
Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
Loves from Viet Nam <3
My gear:
Scope: SkyRover (Kunming Optics) 152mm F/6 Doublets
Mount: JTW Tridents GTR
Camera:
PlayerOne Apollo M-Max
Quark Chromosphere Doublestacked with PST etalon
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Re: 1st Dec Full Disk
And congratulations on the SPOD!!
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
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Re: 1st Dec Full Disk
Thanks for the link.minhlead wrote: ↑Wed Dec 01, 2021 4:22 pm
I am surprised too. But some gain is not a bad thing. A right amount of gain would induce some random noise which in turn will increase bit depth of the stacked image.
https://www.stark-labs.com/craig/resour ... acking.pdf
If you have the time, read this. A very compelling read on the impact of stacking on bit depth.
There is a balance [seesaw effect] with relation to FPS and Gain.
As exposure shortens the Frames Per Second simultaneously go up.
This provides more frames to stack in a given time period.
Meaning more data + less drift during the total capture period.
I find that things go bad when SharpCap Gain approaches 200 in winter.
This may not be true for wider fields.
I am only ever imaging at high resolution with tiny fields of view.
150/10 =1500mm x [1.6 or 2x or 2.6x] GPC x [IMX174] Sensor Crop Factor.
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.