Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
Get a Cloudy Nights T-Shirt Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green GuÖ uh, User

Equipment Discussions >> Electronically Assisted Astronomy

Pages: 1
mpgxsvcd
Carpal Tunnel


Reged: 12/21/11

Loc: Raleigh, North Carolina
Panasonic GH4 for true video observing new
      #6481302 - 04/22/14 02:00 PM

I just got the Panasonic GH4 yesterday. It will do high quality 4k video at 30 FPS up to ISO 6400. Sadly it only goes to Ĺ a second exposures(2 frames per second) in video mode.

It should be really nice for objects in our Solar system though. The 4K @ 30 FPS will be great for the moon. It also has 1080p @ 96 FPS for those nights when seeing is not so great. For planetary it also has the 4.9x crop zoom mode at 30 FPS.

I havenít tried a dark frame with it yet. It is so new that no program except for the one it comes with has support for the RAW files that it produces.

Our local club is observing this weekend so hopefully I will get a chance to test it out.


Post Extras: Print Post   Remind Me!   Notify Moderator  
chasing photons
member


Reged: 03/19/13

Loc: Minnesota
Re: Panasonic GH4 for true video observing new [Re: mpgxsvcd]
      #6481528 - 04/22/14 03:56 PM

Congratulations on your new GH4! We will be anxiously awaiting reports of its capabilities for near real time viewing. Does the remote app currently support the GH4?

Post Extras: Print Post   Remind Me!   Notify Moderator  
ippiu
member


Reged: 12/06/10

Loc: Italy
Re: Panasonic GH4 for true video observing [Re: chasing photons]
      #6481597 - 04/22/14 04:33 PM

Only 1/2 second in video mode?? Not so wonderful!

I would have preferred at least 12.800 or 25.600 iso in video mode and up to 8-12 sec...


Post Extras: Print Post   Remind Me!   Notify Moderator  
ccs_hello
Postmaster
*****

Reged: 07/03/04

Re: Panasonic GH4 for true video observing new [Re: ippiu]
      #6481920 - 04/22/14 07:42 PM

Travis,

What do you mean on "(up to) Ĺ a second exposures on video mode"?
E.g., if in 30p format, will it generate the entire 30 frames but only 2 different images within that 1-second window, or there will only be 2 frames generated, even the setting is 30p?


Or ... "video" you meant LiveView?

Clear Skies!

ccs_hello


Post Extras: Print Post   Remind Me!   Notify Moderator  
jdbastro
sage


Reged: 08/18/07

Loc: W. Coast
Re: Panasonic GH4 for true video observing new [Re: ccs_hello]
      #6482448 - 04/23/14 01:00 AM

Quote:

Travis,

What do you mean on "(up to) Ĺ a second exposures on video mode"?
E.g., if in 30p format, will it generate the entire 30 frames but only 2 different images within that 1-second window, or there will only be 2 frames generated, even the setting is 30p?


Or ... "video" you meant LiveView?

Clear Skies!

ccs_hello




He means that the longest shutter speed selectable in manual movie mode (aka video mode) is 0.5 seconds. Which actually is pretty good. It's the same as the GH3. And twice as long as the max shutter speed on the Sony A7, which maxes out at 0.25 sec. So an 0.5 sec shutter speed means effectively 2 unique frames per second in video mode on the GH4 (and GH3). Those 2 unique frames get packed into a 30p video stream. Regarding 'live view', before (and during) a video recording session, one can 'preview' the scene at 2 fps (if shutter speed is set to 0.5 sec) either on the OLED screen, viewfinder, or on an external HD monitor connected to the HDMI out port on the camera.

Travis, Hurry up already and start using your GH4 so the rest of us can find out how much better it is than a GH3. You lucky dog!!


Post Extras: Print Post   Remind Me!   Notify Moderator  
mpgxsvcd
Carpal Tunnel


Reged: 12/21/11

Loc: Raleigh, North Carolina
Re: Panasonic GH4 for true video observing new [Re: jdbastro]
      #6485255 - 04/24/14 10:18 AM

We will have clear skies tomorrow and Saturday night. I will do a semi dark site tomorrow and my back yard on Saturday. It isnít modified so donít expect great Ha performance.

However, I did discover a few new things. It can do a lossless 2.6x zoom during video with the 1080p @ 60 FPS setting and 200 mb/sec all Intra frame compression. The GH3 could only do 1080p @ 30 FPS and 50 mb/sec IPB.

The GH4 has gamma curves and a new Cin-D profile that can get you closer to the RAW sensor capture than typical color profiles would. With it you can compress the dynamic range of the scene to fit into the 8 bits that the H.264 4:2:0 codec can store.

It can also output 10 bit 4:2:2 1080p @ 60 FPS lossless video via HDMI. That truly is closer to RAW video whereas the color profiles just mimic it.

With the app you can now start and stop the video function remotely. You can also start and stop in bulb mode up to 60 minutes. However, it doesnít have the nifty live time feature that my Olympus E-PM2 has.

I didnít really buy the GH4 as an AP camera. My modified E-PM2 will be better for it. However, I like the completely wireless interaction with it. I just need to go out and buy another iPad to use with it. My wife ran over my sonís iPad yesterday so all I have is my phone for the remote live view now.

The real strength of the GH4 is as an everyday camera. It is relatively light but every bit as good as any A-PSC camera out there. It you canít take great pictures with the GH4 buying a different camera isnít going to help you.

jdbastro's explanation is correct for how the video mode functions. I use live view and stills mode more for AP though.


Post Extras: Print Post   Remind Me!   Notify Moderator  
mpgxsvcd
Carpal Tunnel


Reged: 12/21/11

Loc: Raleigh, North Carolina
Re: Panasonic GH4 for true video observing new [Re: mpgxsvcd]
      #6493387 - 04/28/14 08:45 AM

As always. If you get fancy new equipment the skies will darken and laugh at you. The prediction for clear skies didn't pan out.

I didn't get a chance to observe at all this weekend and now we have the threat of severe storms every night this week.

Hopefully it will clear up again next week. Living in the south is not good for AP.


Post Extras: Print Post   Remind Me!   Notify Moderator  
chasing photons
member


Reged: 03/19/13

Loc: Minnesota
Re: Panasonic GH4 for true video observing new [Re: mpgxsvcd]
      #6493593 - 04/28/14 10:54 AM

Quote:

Living in the south is not good for AP.




Maybe the southeast isn't good, but the southwest is the astronomer's paradise. I can't wait to move to the high desert of New Mexico. Better luck next week.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
5 registered and 13 anonymous users are browsing this forum.

Moderator:  David Pavlich, JayinUT, Mr Greybush 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 671

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics