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matdiver1234

Member Since 15 Jun 2007
Offline Last Active Oct 11 2018 02:44 PM
*****

#397337 GH5 Cozumel, first trip...

Posted by matdiver1234 on 13 July 2018 - 02:40 AM

Very nice! Especially at 1'45". It's like that nurse shark just wanted to test the autofocus capabilities....

Thanks.

 

Matt




#394876 Winter musings

Posted by matdiver1234 on 30 April 2018 - 04:59 AM

GH5 + Nauticam. WB really does work, and 4K 50/60 is just great to have. 10-bit 1080 50p, 10-bit 4K 25p, 1080 up to 180 fps, 4K up to 1.... someone on here said they could not really think of what more to ask for, and I agree. In practice DoF depends on aperture surely? I use the PZ 14-42 3.5-5.6, and DoF isn't really an issue. I guess with your +5 diopter you would have to be careful, but one of the great advantages of 4K is that you can crop and still end up with a full HD image, so you don't always need to be fully zoomed in underwater. Also, 50p slowed down to 25p in post looks very smooth. I don't do macro, but the best macro stuff you see on vimeo etc seems to have been filmed with a tripod. Don't forget that you'll need a decent computer and good NLE to edit!

Just my 2 cents!

 

Matt




#393231 Palau GH5

Posted by matdiver1234 on 12 March 2018 - 12:13 AM

@bubffm yeah, you may be right. Only way to be sure is to go on another dive trip and do some more testing...

Anyway, I've done a revised version with colour correction now, and a different soundtrack of course ;-)

 

 

Matt




#392783 Palau GH5

Posted by matdiver1234 on 27 February 2018 - 10:53 AM

 

My first time in the ocean with this cam., so I'd really appreciate any constructive criticism.

 

Shot mainly in 4K 50p, very little colour grading due to MWB, but exposure adjusted on quite a few of the shots.

 

Pana PZ 14-42 lens.

 

Cheers,

Matt




#392536 IS IT WORTH IT? GH5s - No Stabilization

Posted by matdiver1234 on 20 February 2018 - 02:26 AM

".... he swam around and shine his light everywhere and piss many people off, so watch out for people who abuse high power video light. "

Yeah, I know what you mean. Would have been even worse, i.e. more pink/red if he was closer. 

I have very mixed feelings about these high power lights. I'm very impressed by the tech and the relatively small size, but generally I don't feel that comfortable shining really bright lights on turtles and our fishy friends! All down to personal preference I guess, but I wonder if it could influence fish behaviour in the long-term, maybe even push them to find somewhere less "disruptive"?

 

As regards noise, in my experience MWB can have as much of an impact as ISO. It seems like what's going on when you get a good MWB at 20m, say, and all the reds and yellows look nice, if you then point the cam at something out in the blue the "red boost" translates as noise. The few times it occurred I corrected it very easily with NeatVideo and reducing the red in Vegas curves, but the point is that at the same ISO there was no visible noise for the colourful reef shot. 

 

Matt




#392197 IS IT WORTH IT? GH5s - No Stabilization

Posted by matdiver1234 on 09 February 2018 - 10:37 AM

@lutfu
for your ISO values, just open/import the file in the free PHOTOfun software that comes with the cam. There's useful info available if you just right-click on the thumbnail, including ISO, shutter, aperture etc.
 
Matt 


#391259 Panasonic LUMIX GH5 for underwater video

Posted by matdiver1234 on 15 January 2018 - 08:57 AM

"AFL hold" is buried in one of the menus somewhere. Switch it to "on" and you're good to go. Point at something a couple of metres away, e.g., press AFL once, and that's it. No need to re-focus between shots, unless you want to. 

Before I went on the trip, I thought that I would be using 1080, 50fps 10-bit. However, the advantage of 10-bit seems to be above all in "extreme" grading. I couldn't see any difference on any of the (not very modern) screens in my house. 4k gives you the advantage of being able to zoom in a little at least in post, and provided your shutter speed is twice the frame rate, i.e. 180 degrees, then the slo mo from slowing down 50 fps is really useful. Things like shots that just lasted 2-3 seconds in real time can be made to stand out a bit more.  If you want to go to less than 42% slo mo however, then you have to use 1080. I just put these different options in my custom pre-sets, so it's easy to switch. Variable frame rate is only available with manual focus of course....

One bizarre problem I had was that the camera completely froze at the start of a dive. I had just pressed AFL. Nothing I could do underwater would unfreeze it, including turning it off, pressing any of the buttons, etc. Only after the dive when I could take the battery out and re-insert it did the camera work again. I noticed that there were loads of "this video file cannot be played" on the card in the slot I'd been using. I realised that after a few days' use and transferring my shots every day to the hard drive, the card would probably need re-formatting. It seemed to do the trick, and the problem didn't occur again. 

Matt




#391022 Panasonic LUMIX GH5 for underwater video

Posted by matdiver1234 on 08 January 2018 - 04:37 PM

@Pajjpen - I'll post some clips after I get back. It's not feasible where we are now. I think the low light performance is significantly better than the GH2, but I don't know the GH4. Actually, I found that the test shots I did at 26m were a bit overexposed with auto ISO and exp compensation at 0. Of course, Palau on a sunny day is really seriously bright, not like a Belgian quarry....
Matt


#390910 Panasonic LUMIX GH5 for underwater video

Posted by matdiver1234 on 06 January 2018 - 09:33 AM

Davide, it's here I think:

You can't see through it, but it lets light through. If you look up "Expodisc" you'll see there's a topside product available for MWB, but it won't withstand use underwater.
Cheers,
Matt


#390857 Panasonic LUMIX GH5 for underwater video

Posted by matdiver1234 on 05 January 2018 - 01:09 AM

Hey Davide, I think there's still a video on my vimeo page from a few years ago. Have a look (link in my signature).
The white balance on this cam is so good it's like my old 3-chip Sony,.... for which I paid about 1700 euros 12 years ago. Exactly what I paid for the GH5!
Right now the biggest challenge with the GH5 is deciding which settings to go for...
Ciao,
Matt


#390848 Panasonic LUMIX GH5 for underwater video

Posted by matdiver1234 on 04 January 2018 - 04:36 PM

Re: "... manual WB works really well when shooting ambient light. "
I did my first ocean dives with the GH5 in the Nauticam housing yesterday, here in Palau. MWB does work very well indeed, BUT don't forget the red filter. Below about 10m I found it to be essential. However, even in the very murky vis at the site known as Buoy 6, at about 4pm, the colours, including the reds, really popped even at 26m. I'm still using the same method as with my GH2, which works a lot better for me than a card. It's a piece of grey-white/translucent detergent bottle, held over the port, and pointed to the brightest part of the surface. It's like an expo-disc.
I'll post a clip after I get back.
Cheers,
Matt


#389832 GH5 uw autofocus

Posted by matdiver1234 on 28 November 2017 - 02:33 AM

@Rollin, I see what you mean about switching to MF, but doesn't the AF-L button work just as well? I haven't tested my new setup yet, so I don't have practical experience underwater. I was thinking a single small AF point, aperture f5.6 or higher, then AF-L would do. I have the Pana PZ 14-42, and there's no MF control with the NA-GH5.

 

Matt 




#389622 Little Beach, Nelson Bay NSW

Posted by matdiver1234 on 22 November 2017 - 11:01 AM

Very good. Watched it straight through twice! Interesting marine life, and I like how you have such good depth of field.

 

Matt




#387182 Galapagos 2015

Posted by matdiver1234 on 01 September 2017 - 12:28 AM

Excellent video. In addition to the hammerheads, I really liked the composition around the 1' minute mark, with the red/silver contrast. Nice mix of topside/u.w. too.

Cheers,

Matt




#385773 Ocean Heaven - Socorro Island

Posted by matdiver1234 on 11 July 2017 - 02:38 PM

Excellent video Moses!

 

Matt