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kc_moses

Member Since 08 Oct 2012
Offline Last Active Today, 01:37 PM
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Topics I've Started

How would you shoot this scene?

Today, 08:45 AM

Alright, I'm getting the technical part of the camera handling down. But I'm running into shooting technique. Take a look at this scene that I just got:

 

http://youtu.be/MuBDs7B9XMo

 

(Why all of the sudden I can't embed a Youtube clip?)

 

If I focus on the tiny fish, the ribbon eel will be out of focus, if I focus on the eel, the tiny fish will be out of focus (so you won't know what the eel is trying to eat). I'm shooting with the Panasonic LX100, in manual focus mode with focus peaking. It won't make sense to pick up the camera and move the focus between the eel and the fish, focus pulling between the eel and the small fish are not feasible because the eel keep moving. If I use AF mode, I think the camera will keep hunting focus between the tiny fish and the eel. The eel being almost all black will throw the camera's AF off.

 

I have closed my aperture pretty small to flatten the depth of field, if I close it further, I will have to bump up the ISO and cause more noise. This is shot in ambient light with custom white balance. I don't think a video light would make any different.

 

So, if you're in my situation, what would you do differently?

 

Moses


Panasonic GH4 might get a V-log profile?

16 February 2015 - 08:01 AM

Rumor say that the next GH4 firmware update (end of Feb) will give the GH4 a V-log profile. Just curious, does anybody bother to color grade under water footage?

 

If your white balance is a bit off, do you still use it as it, or you would attempt to color grade it?


Panasonic LX-100 Nauticam housing

14 January 2015 - 10:38 AM

Alright, I just received mine, and seems like there is quite a bit of interest on this camera so I decided to put up some info even though Nauticam is still working on the info.

 

First, I'm not sure if this should go to the Consumer housing section since it's Point and Shoot, but then it's a $900 prosumer m43 sensor camera, so I'm putting it here in the Mirrorless section so moderator feel free to move the discussion.

 

Second, I'm using a 39" 4K TV as my computer monitor, so everything look quite small for me, if the photos are too big for you that you scroll around, sorry about that.

 

A couple initial info:

- The housing ship with rectangle flat port, and handle bracket, cost US$1200

- Additional ports are available (short flat port - US$180, dome port - US$280)

 

Here are the pictures:

1.) Back of the housing, really glad that there is a working real dial feature! The On/Off level above the LCD screen is for Flash.

NA100_01.jpg

 

2.) I paid US$220 to get the vacuum valve.

NA100_02.jpg

 

3.) Rectangle port is not too big.

NA100_03.jpg

 

4.) The Control Ring Knob feels great (mostly for Manual focus), just the right size to use one finger to turn when you put your hand on the left handle. Too bad there is no M8 or M10 hole on top of the housing to mount another ball for focus light (http://reefphoto.com...roducts_id=4746). So the only option is to use the cold shoes which you can't put too much weight/rough with the cold shoes mount.

 

Housing is 7" wide and 6" deep.

NA100_04.jpg

 

5.) Housing is 5" tall, very compact consider the camera has external flash.

NA100_05.jpg

 

6.) The Blue zoom lock. If you dial the blue wheel clockwise all the way, it will lock the zoom level, dial the wheel anti-clockwise to release the zoom lock. You will only use the Zoom lock for the "Short flat port".

 

NA100_06.jpg

 

7.) The housing is very compact for the amount of control dials the camera has. Nauticam put the Aspect Ratio dial at the bottom of the housing next to the lens barrel. It could be hard to reach but it's not a dial that you would use often, kudos to Nauticam for well thought out placement!

 

NA100_07.jpg


LX100 better low light than GH4

05 January 2015 - 09:04 AM

Well, a couple more videos just confirmed it:

 

 

 

I haven't seen any sharpness comparison between the LX100 vs the 12-35mm lens. Personally, when come to underwater, low light performance is more important than sharpness. This is because you always go deep and loose light, and when come to moving picture (video), no one really freeze the frame and pixel peep. What do you think?


Wide angle with GH4 and 14-42mm PZ lens

29 December 2014 - 01:55 PM

Alright, it's not conventional to go this route, but I'm trying to save money so I'm letting the cat out of the bag. A few people here know that I have been using my Opteka WA lens when I have my Panasonic LX-7 set up. The LX-7 have wide angle wet lens challenge, only Inon UWL-H100 works on it, but I'm not willing to spend $500 for a wet lens. With a bit research, I came across the Opteka lens which is for land use, and they happen to have a 67mm version:

 

gh4_wa01.jpg

 

For about $150, it's worth a try when I had the LX7. It works on the LX7, so I'm sure it will work with the GH4. But with 4K, would I see the imperfection of the Opteka lens? You be the judge. Here are the Opteka Lens pictures

 

- Very flat:

gh4_wa02.jpg

 

- Lens is made out of glass, so a bit heavy but will minimize the reflection of the lens barrel when pointing toward the sky.

 

gh4_wa03.jpg

 

- back of the lens is concave, no space between the front and back of the lens, so it won't flood in water.

 

gh4_wa04.jpg

 

- thread size 67mm, will work with lens that have big opening.

 

gh4_wa05.jpg

 

- field of view of 14mm of the 12-42mm PZ lens inside the Nauticam housing. (Took this at night at my hotel room)

 

gh4_wa06.jpg

 

- field of view at 14mm of the 14-42mm PZ lens after attached the Opteka lens. No vignette, fisheye effect will disappear once in water due to water distortion. May be a bit chromatic aberration, but then, it seems to disappear once in water, or is hard to spot due to video, not still.

 

gh4_wa07.jpg

 

Here is the result, watch in Youtube and turn on 4K:

 

The visibility got worse during second dive, and it was about 5pm Winter in Florida. Since the lens is not fast, the GH4 bump up the ISO (shot at shutter priority of 1/60). There are places where you can see noise. I didn't use manual focus at all since it's a WA dive. I used AFC with 49-point focus area. You can see the camera hunt for focus, during the lion fish and the box fish at the end, it's a drawback of the DFD technolgoy Panasonic use. But if the subject doesn't move much, it shouldn't be an issue. The lobster is big, I got really close that its "antenna" can touch my lens, and it show that the Opteka lens is sharp enough. For $150, it's a steal!

 

So in conclusion, the 14-42mm PZ truly function like a point and shoot lens, give you decent macro and with Opteka lens (don't know about the Inon UWL-H100), you can shoot macro and WA in the same dive. My only complain is the lens is not bright/fast. Hope the info help!