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peterbkk

Member Since 25 May 2005
Offline Last Active Sep 05 2014 03:18 AM
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Posts I've Made

In Topic: GH4 - Nauticam Macro Lens/Port Thoughts

04 September 2014 - 05:48 AM

No I mean in practice (not theory) with the 14-42mm PZ, and definitely not stacked.

Oh dear. I'm sorry but I didn't take much notice of distances. I mainly decided which macro lens to use based on size of critter;
- smaller than a nudibranch: use the +10;
- nudibranch or bigger: use the +5;
- establishing MS: no diopter, zoom out to about 15mm and shoot from about a couple of feet away.

(I'm more right brain than left brain)

From memory, with the +10 and the zoom at about 30-35mm, I was shooting from about 2 to 4 inches from the subject.

With the +5, I used a wider range of zoom, using from 20mm to about 35mm, shooting from about 4 to 8 inches, I think.

When I dive Cannibal Rock next week (a great macro site in Komodo), I'lll try to pay more attention to distances....

Regards
Peter

In Topic: GH4 - Nauticam Macro Lens/Port Thoughts

03 September 2014 - 05:57 PM

I just got back from 4 days of excellent diving in Lembeh with the GH4.

I haven't had time to do a proper edit but I know that some of you are interested in how the macro lens combinations worked in the real world. So, I quickly pulled together a few examples. They have not been graded, stabilized or adjusted in anyway.

Here is the equipment that I used.

Panasonic GH4 set to C4K 24fps, 1/50 Shutter Priority, PinPoint Focus-AFL/AEL
Nauticam NA-GH4 Housing
Lens: Panasonic Lumix 14-45mm PZ
Nauticam System 35 Port with Flip Holder
Subsee +5 Macro Diopter
Inon UWL100 +10 Macro Diopter
iTorch 7 - 5000 lumen lights x 2 mainly on 1/4 or 1/2 power

The footage was imported into FCPX, some samples quickly selected, then exported as a 4K Mov file. The 4K file was compressed into 1080P before uploading to Vimeo



On a large monitor, the 4K footage looks great. So, I'm happy with the macro set-up. The Subsee +5 is excellent for larger subjects and the Inon +10 works for little stuff.

The Lembeh Sea Dragon at the start of the sample footage is so tiny that it kept "disappearing" and I had to find it again - like a tiny piece of string with a small knot on the end. I shot that with the +10 Inon.

The red Starry Night Octopus was a big fellow - about the size of a football. The wider whole-body shots were done with just the 14-45mm lens (at the 14mm end of the zoom), but the close-up on the eye was shot with the Subsee +5.

The blue-ring was also the +5 with the 14-45mm zoomed to about 35mm.

What would I change? Not much. It works well. It'd be great if I had a double-flip adapter so I did not need to take off the +5 and put on the +10 for the really little stuff but that's mainly a Lembeh issue and i may find that the +5 works for most stuff elsewhere.

Regards
Peter

PS. Next week I'm off to Komodo to put the 7-14mm / Zen 170mm through its paces.

In Topic: fogging dome port and lens while video recording

02 September 2014 - 07:10 PM

 
Any other ideas or experiences like that? Am I right with my assumptions? Should I have always prepared the camera in an AC-controlled environment like inside the ship?
Thanks


Always stick a small packet of silica gel (dehumidifying crystals) inside the housing. Photo shops sell them but they are a bit pricey. I get them at a $2 shop here in Singapore. Change it every couple of days. I use a small piece of blutack to stick it in a corner of the housing, out of the way of all the controls and o-rings.

Regards
Peter

In Topic: GH4 - Nauticam Macro Lens/Port Thoughts

25 August 2014 - 09:34 PM

Olympus lenses are not stabilised. This can be a problem at long focal lengths


Very true.

Lack of stabilisation can also be a problem for Close-Up wide-angle shots as the impact of any camera movement is obvious for any very close subjects, even against a wide background.

For underwater video, buffeted by water movement, stabilisation is always important, with the only exception being WA shots where the subject is more than a meter away, in which case, the relative impact of camera movement is much less. With WA shots of fish and people, often the subject is synchronised by the same water movement.

Regards
Peter

In Topic: GH4 - Nauticam Macro Lens/Port Thoughts

20 August 2014 - 11:50 PM

What about fitting the 12-35 in the special Nauticam 12-50 port? It's got a 77mm thread, so I'm assuming it's wider than the 65mm macro.

 

Without the special 12-50mm gear, it's $450--only $150 more than the 65mm macro port. http://www.backscatt.../na-36161.lasso

 

Of course,  it would mean getting the 77mm flip diopeter instead of the 65mm, but if it works with the quality of the 12-35, it might be a good trade-off.

 

Unfortunately I don't have that port to test the combination.