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#261 Interceptor121

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Posted 11 August 2014 - 02:58 AM

 

Hi Peter,

 

Thanks for the reply.

My Nauticam housing and the rest of the toys will arrive in a week, I hope.

Can't wait to mess with it.

 

I tested the GH4 with 12-35mm Panny on land. Using 4K, 3840 pixel, focus is slow but it hunts a bit even when subject in middle field.

Also being a camera type lens and not a camcorder or say an RX100, zooming on a subject with bright background will cause insane flicker on the bright areas....ha ha ha.

 

Since it is mirrorless, I wonder why the video focus is not as smart as my Sony NEX-7 and flicker free like NEX-7 when zooming.

 

Anyway, overall I am happy with new nice toys to play with....

 

Thanks n Dive Safe

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Sony A6000 video autofocus is marvellous by the way check that one out


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#262 Davide DB

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Posted 14 August 2014 - 06:48 AM

Guys, a quick info.

 

The new Nauticam 180mm dome for the 7-14mm is it glass or plastic? Does it need an extra ring?

 

I found it on several shop online (I guess) but always without info if it's for mirrorless system or DSRL.

 

I got behind on new toys lately.

 

Thanks


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#263 escape

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Posted 14 August 2014 - 07:56 AM

Guys, a quick info.
 
The new Nauticam 180mm dome for the 7-14mm is it glass or plastic? Does it need an extra ring?
 
I found it on several shop online (I guess) but always without info if it's for mirrorless system or DSRL.
 
I got behind on new toys lately.
 
Thanks

 

14397965303_2df2c647eb_c.jpg

 

Hi Davide, I have that Nauticam dome (prototype) and it's glass, no need extension for 7-14mm.

I think they'll release it soon.



#264 Davide DB

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Posted 14 August 2014 - 08:05 AM

 

14397965303_2df2c647eb_c.jpg

 

Hi Davide, I have that Nauticam dome (prototype) and it's glass, no need extension for 7-14mm.

I think they'll release it soon.

 

 

Ah ok, so the 1000USD 180mm dome I see on several site it's not the new one.

It seems that vendors get bored to add some specs...

 

Thanks.


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#265 recd

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Posted 14 August 2014 - 02:58 PM

 

14397965303_2df2c647eb_c.jpg

 

Hi Davide, I have that Nauticam dome (prototype) and it's glass, no need extension for 7-14mm.

I think they'll release it soon.

EunJae

How is the balance and bouyancy with the glass dome? What size floats and arms are those shown in the photo.

 

Cheers



#266 escape

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Posted 14 August 2014 - 05:02 PM

EunJae

How is the balance and bouyancy with the glass dome? What size floats and arms are those shown in the photo.

 

Cheers

 

recd,

Balancing is better then 6inch acrylic dome.
I'm using
Ø60x200mm carbon fibre float arm (Buoyancy 240g) x 2ea and it's still negative (which I prefer).

 

http://wetpixel.com/...=52332&p=349304



#267 Pete L

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Posted 19 August 2014 - 12:32 AM

Does it have manual focus EunJae?


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#268 Davide DB

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Posted 19 August 2014 - 12:57 AM

 

14397965303_2df2c647eb_c.jpg

 

 

 

BTW nice blockbuster color grading: blue in the shadow and orange in the hilights ;)


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#269 escape

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Posted 19 August 2014 - 10:59 PM

Does it have manual focus EunJae?

Pete.
It doesn't have af gear. Normally I just pre focus on my fin and start shooting.

Edited by escape, 19 August 2014 - 11:05 PM.


#270 ScubaBob

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Posted 02 September 2014 - 10:44 AM

Not the best first showing, but I was finally able to get my GH4 underwater a couple weeks ago. We went out in search of Giant Sea Bass (aka Black Sea Bass) so I started the day with my 7-14mm. Viz was less than ideal, so I switched to the 12-50mm for the last two dives (all footage shown in chronological order). Lessons learned (which are not new or unique to the GH4) are use of manual focus on the 7-14mm and stability (tripod) with the 12-50mm. Overall I'm very excited about using the GH4 more underwater..

 

 


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#271 textilet

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Posted 07 September 2014 - 10:04 PM

We finally got to dive our GH4; here are some thoughts and video:

Our diving is mostly in California in water that often contains particulate matter, as well as being somewhat deep and dark.  Our previous camera (HF-G10) had quirks that manifested in our local environment (especially green water) that took us quite some time to figure out.  We’ve been encouraged by the results we’ve seen others achieve with their GH series cameras in environments like the ones we frequent. 

Our dive site was Ship Rock at Catalina Island in California.  This location offers a deep wall area at 150ft/45m and deeper, as well as progressively more sunlit kelp garden type areas to explore on ascent- a  perfect spot to play with the camera in a variety of settings.

The rig as we dove it:

Panasonic GH4

Lumix 7-14mm lens

Nauticam NA-GH4 housing

6” Acrylic dome port with focus knob

Keldan Luna 8 lights on UL arms

The objective given the lens was to shoot wide shots and not really attempt Macro.  We have discussed the idea of being able to fake “semi” macro with this lens by zooming in to 14mm and then cropping to 25% at 1080p.  But that will probably look funny considering the FOV.  We will attempt that stuff later when we have the quadpod fitted. Mainly we shoot wider angle anyway and aren’t too concerned with macro at this stage.  Being reasonably confident that resolution would be outstanding, we were mostly concerned with low light performance, edge distortion on the Lumix 7-14mm/Nauticam dome combo,  attaining sharp focus to take full advantage of the UHD, banding when shooting against open water, and how to set up the camera. 

For this dive the camera was set to

Cine-D picture style (hoping to gain a little in low light given the lens is not so fast)

Custom white balance at depth on blank pages of wet notes; auto WB in the shallows.

UHD resolution at 29.97p

Picture style settings set to

-5,-5,-5,-5,0

Pedestal at 0

Luminance 0-255

Highlight/shadow at zero

ISO manual (between 200 and 400 trying to avoid noise)

F stop between 4 and 4.5 on the deep portion, stopped down to 11-22 as needed in the shallow area.

Shutter speed at 60

Focus using the partial shutter depress method

We began recording at 150’ after white balancing with lights on using white pages of wet notes.  This has been our method with our previous camera; one diver holds wet notes open at a distance of 3-4 ft from the camera and the camera diver zooms in and sets white balance.  The goal is to white balance not for the fully lit foreground, and not to try to correct the un correctable colors beyond the lights at this depth.   The Lumix 7-14 is so wide even at 14mm that we couldn’t fill sample area with white from our usual distance, and had to move the wetnotes within about 2 ft of the camera.  The GH4 only samples a rectangle in the middle of the frame, so  this helps this distance problem somewhat. 

Noise was visible immediately on the camera monitor, keeping in mind we are already at ISO 200.  Not having time at depth to mess with settings, we simply proceeded with recording.  The noise turned out not to be as big an issue as it appeared (see below).  As far as exposure goes I was actually pleasantly surprised that even with an f/4 lens there appeared to be enough light between the Keldans and ambient to not need to raise the ISO much at all.  The little monitor on the back of the GH4 is very bright and sharp, and it was much more accurate with regard to color and exposure than what I had been used to with our L&M Bluefin monitor from our previous system. Not perfect but ok. The Nauticam housing with the plastic dome is also much less negative in the water than the L&M, which was a nice bonus.  With no flotation added the rig was still easy enough to swim around.  This being basically the first real dive with the camera combo, all the controls were easy to use and we had no problem effectively using the housing with dry gloves on. 

Video from the deep portion of the dive: 

Video from the shallow sunny portion: 

All told we found the capabilities of the camera in these conditions very satisfying. 

Things that made us happy:

Low light performance was fine for our needs.  

Noise in the UHD image easy to remove with neat video.  Since the NR is occurring at UHD resolution and the video is output to 1080p, I could see no  loss of detail in the final image.  I don’t have a 4k monitor so I can’t see if there is a visible difference at that resolution, but for my purposes Neat Video almost magically removes the noise with the only side effect being some occaisional  micro banding, which can be eliminated by building a more complete profile in neat video.

Great detail all around

Shutter depress focus method was able to focus effectively on the target 90% of the time.  Would not attempt to use continuous auto focus however unless the scene was very well lit. Will experiment with manual focus/peaking on later dives.

Battery life was never in question.  Over three hours in the water with camera on and still had two bars.

The footage allows for much more latitude to adjust color and exposure (and obviously framing) than the AVCHD from our HF-G10 did.  This was a surprise but a pleasant one.  This became important because the settings we chose made a flat, somewhat noisy image that needed to be adjusted to be presentable.  

Banding is almost a non-issue.  If there is banding visible in the video we uploaded, it is a product of Vimeo compression and doesn’t appear at all in the source footage.

With the 4k crop, the edge distortion we’ve seen from this lens is reduced and often not visible at all.  Hopefully trying slightly more stopped down/slightly higher ISO combo will eliminate it completely. 

We can make nice looking video with this camera.  As we learn the camera the footage will only improve.

Things to work on:

We need to black out the printing on the front edge of the lens; when shooting into the light the lettering can sometimes be seen reflected in the dome port.

Settings. Our settings produced noise.  As we had it configured there was very fine grain over the whole image.  Even in the bright sunlight at 20fsw, there was visible noise in all the images.  Since ISO is already low, I believe we need to make adjustments to the other settings in the camera. I have read that Cine-D profile is a known source of noise.  Going forward we will be trying Cine-V.  More tweaking is needed before we arrive at our known-good configuration.

UHD files play fine on my Macbook Pro, you can cut and edit no problem, but if you need to apply an effect- such as Neat Video- everything goes in to snail mode.  This is not a deal breaker but it is a reality if you have an older laptop (mine is a 2011).   I need a new one anyway.

Some edge distortion visible at 7mm f/4.

For our first time using a “photo” style camera for video, we were very pleased.

 

 


Edited by textilet, 07 September 2014 - 10:14 PM.


#272 Davide DB

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Posted 08 September 2014 - 02:25 PM

Nice report and good camera work.

 

Are you sure that -5,-5,-5,-5,0 is the way to go?

 

I've seen a lot of user coming from hard core GH2 use going straight to this but I'm reading different opinions. On previous camera there wasn't a real cinestyle profile so people was dialing down everything trying to be flat as much as possible.

Actually yet on GH3 this was not completely true anymore and after several tries a lot of user agreed on a much balanced settings.

GH4 codec is a completely different beast.

 

Bye


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#273 textilet

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Posted 08 September 2014 - 02:55 PM

Actually I'm not at all sure those settings are necessary. Adding all those -5's back in post was a bit laborious. I like the result but I think especially in "easy" conditions like the shallow section we can move some of the work load back in camera. I'm hoping cine-v or raising in camera NR will be the answer to the noise problem, because adding neat video to all clips means final render takes 4 hours plus for a 2 minute clip on my old macbook. Without neat video it's like 30 min which is fine.

#274 ScubaBob

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Posted 09 September 2014 - 05:34 PM

Would love to see an example of before and after with the NEAT video filter applied if you ever have a chance to post anything. I've actually been pretty happy with the amount of noise so far with the GH4 (using Cinelike-V profile all 0's) even at ISO 1600 and 3200, but imagine there will be times when I will need some cleanup.

 

EDIT: Oh, and thanks for the great write-up!


Edited by ScubaBob, 09 September 2014 - 05:36 PM.

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#275 textilet

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Posted 14 September 2014 - 06:47 PM

I may edit one up at some point when I get time. I'm hoping some settings tweaks will make it a moot point. There's supposed to be a firmware update announced tomorrow that's got my interest piqued as well ☺

Edited by textilet, 14 September 2014 - 06:48 PM.


#276 ScubaBob

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Posted 16 September 2014 - 07:13 PM

Wonder if that one (rumor) was all hype or truly a sign of things to come??


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#277 textilet

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Posted 25 September 2014 - 07:15 AM

Here is a before/after for you Bob, before is just raw and after is with neat video and a little color/contrast. Also sharpening in neat video is much better than unsharp mask (at least with the downscale in play).
With the compression I'm not sure if you can really see the noise the same way it shows on the source.

I noticed the nauticam port chart was updated recently, showing a 180mm glass port and adaptor with focus knob as compatible with the 7-14mm lumix. @escape is there an improvement in the corners with the larger dome? I would love to be able to run the lens at least at f5.6 and 7mm

#278 ScubaBob

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Posted 25 September 2014 - 12:43 PM

Thanks Trevor! I think you are right that the noise is not as visible on the compressed version, but I'm thinking even with the amount of contrast applied you would have ended up with noise without the neat video. May have to invest in the plug-in.

 

Bobby


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#279 escape

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Posted 25 September 2014 - 04:27 PM

Here is a before/after for you Bob, before is just raw and after is with neat video and a little color/contrast. Also sharpening in neat video is much better than unsharp mask (at least with the downscale in play).
With the compression I'm not sure if you can really see the noise the same way it shows on the source.

I noticed the nauticam port chart was updated recently, showing a 180mm glass port and adaptor with focus knob as compatible with the 7-14mm lumix. @escape is there an improvement in the corners with the larger dome? I would love to be able to run the lens at least at f5.6 and 7mm

 

I don't have direct comparable image from both dome but I can say 180mm dome is pretty good with wide aperture at 7mm.



#280 textilet

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Posted 07 December 2014 - 09:26 PM

Has anyone else tried the 180mm dome option with the 7-14mm lumix?





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