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Davide DB

Member Since 30 Nov 2010
Offline Last Active May 18 2018 04:18 AM
*****

Topics I've Started

Lost In Time (Junkers Ju 52 wreck)

15 May 2018 - 02:29 AM

After two years of struggles I finally came back filming. Nothing special, just a short dive on a recently discovered wreck near Capri Island. A good chance to use for the very fisrt time my GH4. Average water visibility but pitch black so I bit the bullet and filmed everything at ISO 1250.

 

The Junkers Ju 52/3m (nicknamed Tante Ju ("Aunt Ju") and Iron Annie) is a German trimotor transport aircraft manufactured from 1931 to 1952. In a military role, it flew with the Luftwaffe as a troop and cargo transport and briefly as a medium bomber. The Ju 52 continued in postwar service with military and civilian air fleets well into the 1980s.
The wreck was discovered in the 2016 and lies at 72m (236ft) on a sandy bottom in the so called "Mouths of Capri", the channel between Capri Island and the mainland ( https://goo.gl/maps/QCha5zKrpa82).
Identification and cause of loss are unknown so far.

 

Shot on a Panasonic GH4 + Lumix 7-14mm; Nauticam Housing, 2x Keldan Luna 8 CRI + 2x Ulixes 12K Lumen lights (ulixesonline.com/).

Music track "Guardian Angel" by Oliver Ledbury, licensed via Audio Network

 

Cover photo by Marco Bartolomucci. You can check his amazing photos from the dive here: https://goo.gl/FgQhwL

 

 


1 Inch ball mounts o-ring size

07 February 2018 - 02:57 AM

Given that these oring are sold at outrageous prices, What's the size of these o-rings?

 

Thank you in advance


Lighting the scene

24 January 2018 - 01:18 PM

David, I agree with your point of view. What do you mean by the last part “ light from ABOVE emulating sunlight”?

 

Let's see if a mod can split this thread ;)

 

On WA shots I used to place my light arms more or less at the same height of my camera. Now I try to place them higher than my camera trying to have a light angle coming from above. I like the shadows I get. Of course every reef is different so your mileage may vary.

 

Now I have 4 lights. Two old Keldan Luna 8 CRI (5K lumen each I guess). Two prototypes built by a friend of mine (12K lumen each). I never mounted them together. IMHO I would get a correctly exposed flat image, nothing more.

 

When a keen buddy is available I give him the most powerful set. I fill the subject in front of me with my Keldan and my buddy "flies" 1,5 meters above my head trying to light up the scene/subject from above. Then we play with different angles.

I find that in this way you get amazing shadows. Sometime we get a sense of depth impossible to get in other ways.

Sometime we try a different approach: I light up part of the scene in front of me filming my buddy which in turn light up further far away. Sometimes we get clips we like a lot, sometimes just trash.

 

This video was made from two dives we experimented a lot this technique. I made a lot of mistakes (i.e. I left my lights on while being well far away from the subject getting only a lot of backscatter. The Gerardia Savaglia was completely burnt on the highlights cause I haven't zebra on my GH3) nevertheless you can see several examples of what I'm trying to explain. 

 

 

The amphora at 1:12 and 1:24 is light up from my lights and from my buddy above. The same scene at 1:30 is light up only by me and as you can see it's not simply a matter of exposure. The clip at 1:12 has a completely different depth of field.

 

We used the same "tricks" on most of the clips of this video:

 

 

You can see what you can get on a big sponge light up from the opposite at 2:13.

Again the small gerardia savaglia from 2:40 is light up from above even in the close up clip.

At 3:22 you can see my buddy moving upwards while I film the small dendrophyllia and you can see how the reef appears under this kind of light.

At 4:29 an example of me lighting up part of the scene in front of me while my buddy, in turn, lights up further far away. We gently move together giving a great "sense of depth" IMHO.

 

I understand that I have very particular tastes for UW imaging. I do not pretend to be mainstream and sometime I'm very contentious here ;)

Once you have several lights and some collaborative buddy you can be very creative.

 

In conclusion... we never get bored underwater.

 

Bye


WTB: N85 MACRO PORT 45 #36135

15 December 2017 - 05:28 AM

Macro port for Leica 45mm.

 

Let me know if you have one for sale.


4K to 1080 Pros & How To

27 September 2017 - 06:16 AM

I'm starting to experiment with a GH4.

 

Right now I'm just interested in a 1080p output but a lot of doubts and questions arises...

 

On several articles and posts on the net I read that converting from 4K to 1080 results in a far "better" image and colors. IIRC I even read that I could get a 1080 4:2:2 clips from a 4K 4:2:0 clips. Mumble Mumble...

Could you elaborate on this and share your current workflow?

 

  • If I'm not interested in crop i could create a 1080p project and throw 4K clips at it.
  • I could create a 4K project, eventually take advantage of some crop and finally export everything at 1080p.

 

I made some test with the two above scenarios and frankly I couldn't find substantial differences between the two. I use Edius so I have no transcoding. I just edit directly the original 4K clips as usual. Of course the 4K project is slower than the 1080p one.

 

Thank you in advance