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Davide DB

Member Since 30 Nov 2010
Offline Last Active Jul 15 2014 02:55 PM

#349741 GH4 footage and rig pic

Posted by Davide DB on 02 July 2014 - 04:16 AM

The issue of autofocus with the 4:3 cameras is that is is slow and sloppy however considering that the 7-14 has a minimum aperture of f/4 and the camera a 2x crop factor you can focus the camera on land at 3 feet, lock focus, jump in the water and you should have all in focus from 1.5 feet to infinity.


If instead you are shooting something closer or you zoom you have a problem and you need the camera to focus this is where manual focus is useful as autofocus as mentioned before is .....not that good


I do not agree here,


With my beloved old GH2 autofocus is fast as hell with 7-14mm. I tested hundred of times in really challenging conditions. IGH3 autofocus si still better than GH2. 

On video you have to set spot focus, not multi point.



#347018 Panasonic GH4

Posted by Davide DB on 29 April 2014 - 02:36 PM

It's the same old problem of forum search that skip search keys with three or less letters.
We should suggest to panasonic to name the next camera with a longer name ☺

#346887 Upcoming Panasonic GH-4K

Posted by Davide DB on 28 April 2014 - 12:07 AM


 I was going to ask that if, despite your disclaimer, you were going to make the switch  ;)

Mine, ahem, is due to ship next week :)


Little bit OT...

The problem is that it's very difficult to sell. Yes I will not produce any better art with it. It's just my try to save some money for the future  :mocking:

Furthermore I will keep for myself optics and ports that are compatible for the upgrade so it's difficult to sell just the housing without a port. I managed to get a 14-42mm port.



#345967 Mucky Secrets - The Marine Creatures of the Lembeh Strait - Series

Posted by Davide DB on 10 April 2014 - 06:47 AM

Good news for my 22 months old baby!

He is addicted to reef life of Andamans and Muchy Secrets, prologue. So finally a new hit!


Good work

#345892 BMPCC Underwater Test

Posted by Davide DB on 09 April 2014 - 04:00 AM

IMHO Matt Scott tutorials are some of the best out there as clarity and authority. 


He is a Edius guru and nearly all I learnt about Edius CC comes from his tutorials. They worth a look because most of that concepts are valid also for other NLE.



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#343223 Upcoming Panasonic GH-4K

Posted by Davide DB on 12 February 2014 - 03:37 AM

Once upon a time a reserved doc but now it's spreading all across the interweb :alien:


GH4 presentation with definitive specs:




It seems that this time Panasonic listened to they customers and hacking community.


BTW There are some comparative tables against an upcoming 7D MKII :)

#343050 Upcoming Panasonic GH-4K

Posted by Davide DB on 08 February 2014 - 06:14 AM

First nice feature breakdown on this camera (ironic)

Time to jump from GH2 to GH4...

#342997 Upcoming Panasonic GH-4K

Posted by Davide DB on 07 February 2014 - 12:19 AM





A nice hands-on from a videographer point of view:





#342940 Hero3 Black. How do I take advantage of this high definition camera?

Posted by Davide DB on 06 February 2014 - 02:06 AM

Have fun Davide...



Hi SPP, glad you liked my test but.. you are ovverating me :)


At the beginning I installed GoPro Studio to run some test with protune and cineform files. I loaded both on the timeline. My project was using Canopus HQX codec (4:2:2 10 bit as Cineform) which Edius transcode in background while editing. I tried to CC both and I found no differences between them. Cineform files where huge and lighter to edit but once the HQX files were ready  no difference at all.

I'm a beginner so maybe I missed something. If I can I try to edit and CC in the same editor.

I found that the best filter/tool for underwater clips is the crominance mask: it let you pick up easily one range of color (e.g. all the water) without touching other part. After that you can apply whatever filter you like to this selection. A simple three wheel color correction to remove that water green cast.

When later I saw the result on my TV I realized I forgot to apply an Unsharp mask. But I was too lazy to reopen the project  :sleep:  Anyway you are correct: current edit is way too soft.

I have a  DELL U2412M monitor and I'm realizing there is a lot of difference between what I see on my monitor and other TV/computers. It's becoming a problem...



#341509 microFT Video WA Options: 12-35mm, 7-14mm or 8mm?

Posted by Davide DB on 07 January 2014 - 06:39 AM

I also wonder if there is any advantages with a fast lens like that oly 12mm f2.0  ? I get more light in but Will it be difficult whith a open aperture when it comes to get the image in focus because the short depth of field ? If I am forced to use a smaller aperture like 6.3 for more dof to get sharp images then  its no use/advantage whit a fast lens underwater.Whats your experienses. 


Usually I set the aperture of my 7-14mm to F5. It's sharp enough for my taste but it mantain a useful DOF. This tool it's very useful:




The trick is trying to stay hyperfocal as much as possible.


I guess that using a faster lens you would fall having soft borders or blurred background. I saw a lot of cave video shot with FF camera having extremely soft borders. You end up beyond dome limits.

#339323 Video - Ordinskaya Caves near Ural mountains

Posted by Davide DB on 12 November 2013 - 07:48 AM

Hi Richard,


I use Edius too. Same export parameters as you except I use VBR with max 15Mbps for 720p and 25Mbps for 1080p.

On pc the video is perfect but on TV I see a lot of compression artifacts on all dark area not covered by your powerful lights.

I think there's nothing to do. Maybe trying to increase the bitrate but sometimes the vimeo encoder sucks in low light :)


BTW a little bit OT. I found that using a canopus HQX superfine 10bit project sometimes helps with color correction and maybe in the export too.



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#339130 Video - Ordinskaya Caves near Ural mountains

Posted by Davide DB on 07 November 2013 - 03:52 AM

Beautiful video indeed.



Yesterday I was seeing it on my 46" smart-tv via the vimeo app and I noticed a lot of macro-bloks/pixelation in the low lights. Maybe you should reload with a higher bitrate. In some video vimeo encoding strives to renders low light details.



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#338485 Video catelog

Posted by Davide DB on 22 October 2013 - 08:59 AM

Few years ago I dreamed of Lightroom being a real DAM (Digital Asset Management) software...


They partially add support for video files with scarce results...


Recently Red Giant come out with this:


Few codecs (Canon, it's really strange...) and only for Mac right now. Maybe it will be different in the future. It has a lot of potentialities. I think it's what you are looking for.



They say that a Windoze version is behind the door.




#337727 Kudos to Nauticam

Posted by Davide DB on 03 October 2013 - 08:05 AM

Two months ago I got a minor leak on my Nauticam GH2 housing while filming at 80+ meters.


Miraculously I managed to avoid soaking my camera and lens: at the end of the dive I had an half glass of water into the dome but everything was perfectly dry.

Opening the housing I did not find any clear evidence of fault: no hair or dirt on the o-ring so I returned the housing and 7-24 dome at Nauticam Italy (it is still under warranty). 


Housing and dome was sent to Nauticam HK, pressure tested and inspected. It was ok so it was definitively my fault  :(

Anyway given that one year of intense use was passed already, they completely disassembled it, serviced and returned to me WITHOUT ANY FEE (not even shipping cost).


I was far from home so I sent housing and port without boxes. I received them with brand new boxes and it was so shining (it had again the plastic film on the display) that I had to check its s/n to be sure it was mine...


What can I say more?  Nauticam all the life  :D And kudos to Nauticam Italian dealer for his professional service 




I even got a short movie from that dive prior to escape to the surface (one and half hour later...). In the original footage I can hear the scary leak alarm  :sleep:




#330721 Blackmagic Pocket Cinema Camera: Yes there will be housings!

Posted by Davide DB on 02 May 2013 - 06:23 AM

Davide, the point of forums is to discuss the realms of possibilities and nuances that may not be considered.  Even Ryan started thinking about the Ultra Prime 6mm as a possibility and I'm sure if he saw the Century 6mm with adapter, he'll probably be convinced.  Now is it practical to get T stop, focus gears etc on a small housing? Most probably not, but hey neither is getting a RAW or even a Pro Res camera, even @ under $1k. :)
Going back to the 7-14 Lumix, I remembered it showed low distortion because it is software corrected in stills. Were your tests using still software that is corrected or video that's uncorrected?  My notes say CA but also barrel distortion @ 7-10mm.

The point of forums should be to let users to take an informed decision. The paradox on the interweb is that it's full of people speaking of what sex an angel is. There's space for everything of course, but when the noise increase (nuances that may not be considered) forums like this loose sense.
It happens dozen of times. Every time you google for buying a smartphone, a camera, a car... you will find someone complaining about the most exotic nuances.

MFT is probably the most versatile mount/size as today. It's not just chance that it's the second BM camera designed with this mount. You can mount nearly everything. I used for fun on my GH2 the most exotic lenses with cheap adapters.
The problem is that 90% of camera manufacturers and users don't even suspect that you can bring a camera underwater. Hence 90% of housings have ports for standard or most common lenses. You have some exception like the latest Red camera housings (but, again, we are speaking of a complete setup in excess of 30K euro).
My bet on upcoming BMPCC housings is that you will have something like Nauticam mirrorless line: a simple yet bulletproof design with standard acrylic ports for current m43 lenses. They already have everything ready. Hence forget about Tokina 11-16 or other wonderful cinema lenses. Nobody will design a custom ring adapter for manual focus or zoom for a 995$ camera.... We will see. Of course I hope to loose my bet.

BTW 7-14mm is one of the best wide angle lens out there. Tack sharp with minimum distortion and CA in real word use. Just search for it on Vimeo. I forgot that here we are filming pool tiles alll the day
Distortion is corrected in camera and it works perfectly with video too, also on Olympus bodies.
AFAIK the BMPCC has an active MFT mount so it should work. Actually a lot of people have a lot of questions on "active mount" definition.

@Timccr: you have a lot of amazing spots just near you. If you are a wreck lover i suggest to not miss the VALFIORITA near Messina: better than the THISTLEGORM.
I know that wide angle shots will likey be a problem with the BMPCC crop factor but again, sadly nobody cares fo underwater filming while designing a camera
I hope to see some BMPCC sample with the 7-14mm soon. This is what you can expect from the 7-14 on MFT mount: