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Equipment Discussions >> Electronically Assisted Astronomy

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jgraham
Postmaster
*****

Reged: 12/02/04

Loc: Miami Valley Astronomical Soci...
Re: Real-time Observing with a DSLR new [Re: Moromete]
      #6076006 - 09/11/13 10:34 PM

Another super productive night here. It is way too hot and humid to be outside with the mosquitoes, but with my remote observing gear I'm exploring every planetary, globular, and galaxy shown on Starry Night Pro in the region near eastern Aquila, Sagitta, and Delphenus. This is the kind of camera-assisted observing that I really enjoy; take a small section of sky and explore everything there is to see.

Fun stuff.


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Dragon Man
Carpal Tunnel
*****

Reged: 03/07/06

Loc: Snake Valley, Australia
Re: Real-time Observing with a DSLR new [Re: jgraham]
      #6076233 - 09/12/13 01:07 AM

Grab it all while you can John. Before the clouds return

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jgraham
Postmaster
*****

Reged: 12/02/04

Loc: Miami Valley Astronomical Soci...
Re: Real-time Observing with a DSLR new [Re: Dragon Man]
      #6076446 - 09/12/13 07:34 AM

No kidding. We'll be having thunderstorms today. Wonderful night last night. I now have a list of planetaries that I want to go back and check visually. At the very end of the evening I picked a target for imaging (NGC 40), set my camera running, and went to bed for an hour. Got up a tad early and stood outside for a bit soaking up the quiet night before bringing my gear in.

Wonderful hobby.


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mattflastro
Vendor - Astrovideo Systems


Reged: 07/31/09

Loc: Brevard County , FL
Re: Real-time Observing with a DSLR new [Re: Moromete]
      #6076755 - 09/12/13 11:00 AM

Quote:

Max frame integration is 5s in Live View and ISO goes up to 6400.

There is also a special Magiclantern ISO setting which makes the image even brighter in Live View and there is a Black Level setting too.

I think a Canon 550D in 5s Live View mode with Magiclantern is almost as sensitive a Samsung SCB2000 cctv.

I saw M42 quite nicely in 4s Live View mode with my Canon 550D. See the image below.




based on some dark room tests the astronomy video cameras have an equivalent ISO between 50,000 and 80,000 . Yes, ISO 50,000 - 80,000 .


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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: Real-time Observing with a DSLR new [Re: mattflastro]
      #6080059 - 09/14/13 09:45 AM

Quote:

Quote:

Max frame integration is 5s in Live View and ISO goes up to 6400.

There is also a special Magiclantern ISO setting which makes the image even brighter in Live View and there is a Black Level setting too.

I think a Canon 550D in 5s Live View mode with Magiclantern is almost as sensitive a Samsung SCB2000 cctv.

I saw M42 quite nicely in 4s Live View mode with my Canon 550D. See the image below.




based on some dark room tests the astronomy video cameras have an equivalent ISO between 50,000 and 80,000 . Yes, ISO 50,000 - 80,000 .




Ok, now it's my turn.

With Canon T2i + MagicLantern in can use ISO 409.600 in LiveView to see DSOs!

According to MagicLantern, they have implemented a NightVision mode in LiveView:
"LV Disp.Gain (NightVision): -3EV...+6EV

Background: in Canon cameras, ISO has two components: native (100, 200, 400, 800, 1600 or 3200) and digital. For example, ISO 160 is done by driving the sensor at ISO 200 and darkening the image by 1/3 EV.
This feature lets you adjust the digital ISO component in LiveView (display gain). Display gain affects LiveView preview (in photo mode) and recorded video (in movie mode). It does not affect still images.
In photo mode, this feature lets you frame the image in extremely dark places, or with strong ND or infrared filters.
In movie mode, this feature lets you record at these equivalent ISO values:
50, 25 and 12.5 ISO (that is, ISO 100 with -1, -2 or -3 EV digital gain)
12800, 25600, 51200, 102400, 204800, 409600 (ISO 6400 with +1...+6 EV gain)
If you have a low-contrast scene with one or two stops of extra highlight headroom, you will get less noise in movie mode if you increase ISO by one or two stops (but no more than 1600) and cancel the brightness change with a negative display gain. To check for overexposure, hold the shutter pressed halfway or use the banding detection tool (see false color).
Note: in movie mode, with manual exposure active, ML will also enable auto ISO and will lock the ISO value. This trick is needed to enable display gain.
"

http://magiclantern.wikia.com/wiki/Unified/UserGuide

I tell you, LiveView on Canon 550D became fantastic for DSO observing with MagicLantern. Try it!

Thanks to MagicLantern, Nikon DSLRs or other DSLRs for DSO live viewing became a joke versus Canon DSLRs.


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Mittag56
sage


Reged: 07/08/09

Loc: West Amboy, N.Y.
Re: Real-time Observing with a DSLR new [Re: jgraham]
      #6080230 - 09/14/13 11:32 AM

Been doing same as you for a couple years now..using APT for control...my only big problem is heat related....just changed to a T4i for the articulated screen so it can be moved away from body and I won't have to stand on my head...still toying with the idea of a cooled enclosure to really keep any heat in check..

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mattflastro
Vendor - Astrovideo Systems


Reged: 07/31/09

Loc: Brevard County , FL
Re: Real-time Observing with a DSLR new [Re: Moromete]
      #6080372 - 09/14/13 01:09 PM

Quote:

Quote:

Quote:

Max frame integration is 5s in Live View and ISO goes up to 6400.

There is also a special Magiclantern ISO setting which makes the image even brighter in Live View and there is a Black Level setting too.

I think a Canon 550D in 5s Live View mode with Magiclantern is almost as sensitive a Samsung SCB2000 cctv.

I saw M42 quite nicely in 4s Live View mode with my Canon 550D. See the image below.




based on some dark room tests the astronomy video cameras have an equivalent ISO between 50,000 and 80,000 . Yes, ISO 50,000 - 80,000 .




Ok, now it's my turn.

With Canon T2i + MagicLantern in can use ISO 409.600 in LiveView to see DSOs!

According to MagicLantern, they have implemented a NightVision mode in LiveView:
"LV Disp.Gain (NightVision): -3EV...+6EV

Background: in Canon cameras, ISO has two components: native (100, 200, 400, 800, 1600 or 3200) and digital. For example, ISO 160 is done by driving the sensor at ISO 200 and darkening the image by 1/3 EV.
This feature lets you adjust the digital ISO component in LiveView (display gain). Display gain affects LiveView preview (in photo mode) and recorded video (in movie mode). It does not affect still images.
In photo mode, this feature lets you frame the image in extremely dark places, or with strong ND or infrared filters.
In movie mode, this feature lets you record at these equivalent ISO values:
50, 25 and 12.5 ISO (that is, ISO 100 with -1, -2 or -3 EV digital gain)
12800, 25600, 51200, 102400, 204800, 409600 (ISO 6400 with +1...+6 EV gain)
If you have a low-contrast scene with one or two stops of extra highlight headroom, you will get less noise in movie mode if you increase ISO by one or two stops (but no more than 1600) and cancel the brightness change with a negative display gain. To check for overexposure, hold the shutter pressed halfway or use the banding detection tool (see false color).
Note: in movie mode, with manual exposure active, ML will also enable auto ISO and will lock the ISO value. This trick is needed to enable display gain.
"

http://magiclantern.wikia.com/wiki/Unified/UserGuide

I tell you, LiveView on Canon 550D became fantastic for DSO observing with MagicLantern. Try it!

Thanks to MagicLantern, Nikon DSLRs or other DSLRs for DSO live viewing became a joke versus Canon DSLRs.



What version of Magic Lantern are you using?


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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: Real-time Observing with a DSLR new [Re: mattflastro]
      #6080631 - 09/14/13 03:46 PM

A recent nightly build of ML.

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Chris A
Pooh-Bah


Reged: 02/03/07

Loc: Toronto, Canada
Re: Real-time Observing with a DSLR new [Re: mattflastro]
      #6082236 - 09/15/13 03:01 PM

Matt I clicked on your link hoping to see an image from you using that DSLR

Chris

Edited by Chris A (09/15/13 03:01 PM)


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mattflastro
Vendor - Astrovideo Systems


Reged: 07/31/09

Loc: Brevard County , FL
Re: Real-time Observing with a DSLR new [Re: Chris A]
      #6082296 - 09/15/13 03:39 PM

Chris, it wasn't my post , it was Moromete's .

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Chris A
Pooh-Bah


Reged: 02/03/07

Loc: Toronto, Canada
Re: Real-time Observing with a DSLR new [Re: mattflastro]
      #6082322 - 09/15/13 03:54 PM

Ok sorry about that Matt my apology.

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Chris A
Pooh-Bah


Reged: 02/03/07

Loc: Toronto, Canada
Re: Real-time Observing with a DSLR new [Re: mattflastro]
      #6082326 - 09/15/13 03:59 PM

Too bad there is no support for my modded Canon 40D. Oh well what can you do.

Chris A


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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: Real-time Observing with a DSLR new [Re: Chris A]
      #6082358 - 09/15/13 04:23 PM

I posted at page 2 of this thread a screenshot with M42 on my T2i display with MagicLantern in action.

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Chris A
Pooh-Bah


Reged: 02/03/07

Loc: Toronto, Canada
Re: Real-time Observing with a DSLR new [Re: Moromete]
      #6082447 - 09/15/13 05:10 PM

Okay thanks Luc! I had a look at your M27 taken with your unmodified Canon 550D (T2i) and it looked nice. It is hard to tell or see the M42 image since it was a capture using another point & shoot camera of your screen. Could you please try a fainter DSO since M27 & M42 are quite bright? I know that your Canon 550D (T2i) is unmodified so lets not pick an emission type object but a reflective object like M45 which is coming up higher/earlier now? I am just curious at what a DSLR can actually do when it comes down to observing DSO's in near real-time of say 3 minutes or less. I have not really given my Moddified Canon 40D a chance at this but now that I have a couple of 2" filters IDAS P2 & Astronomik UHC, I will try it out and compare it to the MC Universe.

Chris A
Astrogate


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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: Real-time Observing with a DSLR new [Re: Chris A]
      #6085079 - 09/16/13 11:54 PM

When spare time and weather will cooperate with me, I'll give it a try.

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Chris A
Pooh-Bah


Reged: 02/03/07

Loc: Toronto, Canada
Re: Real-time Observing with a DSLR new [Re: Moromete]
      #6085130 - 09/17/13 12:47 AM

Okay thank you sir.

Chris


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