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Davide DB

Member Since 30 Nov 2010
Offline Last Active Jul 13 2018 01:26 PM

Topics I've Started

WTB: N85 MACRO PORT 45 #36135

09 July 2018 - 02:37 AM

As per title.



Keldan Luna 8

21 May 2018 - 01:23 PM

Hi all,

A quick question. Do you know if the plastic magnetic circular switch is user serviceable?

Last week I dove in a river with a lot of mud and now the plastic ring is a little bit though.
I tried with compressed air, water... I guess it should be opened for a complete cleaning.

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.