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thani

Member Since 13 Aug 2008
Offline Last Active Today, 08:18 AM
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#396266 GH5s 4k test footage

Posted by thani on 11 June 2018 - 03:57 AM

I agree, those colors do look very nice, especially for all ambient lighting.  Thank you - you just made my decision much harder.


Sorry about that mate. I bought it cause I already had the housing for the GH5. My plan is to use the GH5 above water and the GH5s under. I always feel that the under story needs to be complemented with the above water side to be complete.


#396200 GH5s 4k test footage

Posted by thani on 09 June 2018 - 04:34 AM

Hi fellows,

I’d like to share with you my test for the GH5s. The primary focus was to test how would the camera produce colors with just ambient light. The secondary was to test the autofocus in challenging conditions. The clips were taking around 25m in bad visibility and with a lot of particles. Thirdly, I wanted to test the low light performance. The amount of light in summer at 25m in our seas is relatively dim. And it presented a good test for the light sensitivity of the camera which I sat to variable with a maximum of iso 6400. This is a result of two dives on the same day. My rig still needs balancing.

I am quite pleased with the camera ability to produce such good color rendition when white balanced on a gray card with a red filter. My gray gloves which are a shade darker than the 10% gray card produced more pleasing colors and needed little or no color grading in post beside exposure adjustment.

The autofocus, despite the challenging conditions with bad visibility and numerous particles, was really good and definitely much more better than my aging eyes :) it is fair to say that it can do the job more than 90% of the times.

The low light performance was good which resulted in better exposure, color production and autofocus.

I know many would prefer the GH5 over the GH5s due to the lack of IBIS. Honestly, I have not tried IBIS underwater and I have read mixed reviews. However, the color rendition of this camera in ambient light is beyond the capability of the GH5 and overweighs the IBIS in my opinion.    

The setup:

Nuaticam housing with 7” dome,

Dive and See 5.5 monitor,

Panasonic 12-35mm 2.8 version ii,

Red filter,

Standard picture profile,

Variable ISO with maximum 6400

 

https://youtu.be/X1fKNylMj74




#392185 IS IT WORTH IT? GH5s - No Stabilization

Posted by thani on 09 February 2018 - 01:30 AM

GH5s underwater low light test:

 

https://youtu.be/8Km50t5Kr2U




#391529 Panasonic LUMIX GH5 for underwater video

Posted by thani on 22 January 2018 - 10:33 AM

IMHO That setup is for a very specific task. Like enlightening a big animal in blue shallow water in sunlight or similar.
I would never use that setup for a plain wa shot.
Shadows are your best friend not your enemy.
I would give extra light to my buddy asking him to light everything from above. You get a dramatic effect like 3D with increased DOF.
If no buddy is avail then place all your lights as close as possible and move to enlight from above emulating sunlight.

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


#388201 Sony 12 - 24 f/4 GMaster.

Posted by thani on 06 October 2017 - 06:39 PM

Cant agree more if one is shooting full frame video. Youd need 9 dome to support such wide lens. The challenge with such setup for video is ergonomics but again this is subjective.
By the way, this is not a G Master it is a G series Sony lens.
Here is the latest review:
https://www.dpreview...fe-12-24mm-f4-g


#387390 Sony RX0

Posted by thani on 07 September 2017 - 10:19 AM

Thani,
 
Is 4K *REALLY* all that important ? 
 
My impression was that it was mostly hype. I suppose as time goes on it will be mainstream but how far away is that?
 
If you could only chose ONE feature above any other thing, what would it be?

I always shoot 4k to help me in post production:
Helps me frame the shots better,
Use software stabilization,
Publish high quality FHD

One of the most important features IMHO is Daynamic Range.


#387236 Sony RX0

Posted by thani on 02 September 2017 - 09:58 AM

Hummm 24mm it's really too narrow. With a flat port it's even narrow. I see it as a very specific tool.
It a shame that Sony chose that infamous shape for its real action cam fdr x3000.
I had the opportunity to use it and it's the best one. Optical stabilization and amazing image quality.
Unfortunately no uw housing and no way to have a display in a useful way.

If it is 24mm full frame equivalent as advertised, it is not too narrow. I agree with kc_moses that it could serve as a B-cam. When shooting either macro or ultra-wide (weitwinkel) angle, the 24mm sets in between and would capture angle of view that will add value for both lenses. Of course, it all depends on the image quality and how closely it color matches with the A-cam :).
What do you guys think?


#386185 Bigblue lights feedback

Posted by thani on 26 July 2017 - 09:16 AM

here is the topic of a video clip that shows the color rendering of the lights above:

http://wetpixel.com/...showtopic=60366




#386183 Color Checker as refrence

Posted by thani on 26 July 2017 - 09:13 AM

Hi all,

 

I always wanted to share my finding for using a color checker for underwater video. I will detail this in a later edit hence I have to go now :)

Here is a clip:

https://youtu.be/cI7uxQYAm3o

 




#382145 Newb 'Purple Haze' Question

Posted by thani on 10 March 2017 - 08:25 PM

What video codec you are using?
My friend had a similar issue with his Sony FS100/FS700, I think. It is discussed in detail on this forum. This haze (halo rings) only appears when shooting a subject in a blue water column like your manta shot.
I think it is to do with low bit rate of the codec and thus the compression of data causes such bad rendering of the blue water background. XAVC-S is better suited for video on the a6000 (50 Mbps).
check this link:
https://www.dpreview.../thread/3867538
If you are already using XAVC-S, then try different color gamma.


#381402 Sony PXW-FS7 underwater

Posted by thani on 10 February 2017 - 05:53 PM

Thanks guys for your comments. Hear is my feed back:

The camera setup:
Shooting mode: Cine EI which gives more dynamic range (around 14 stops)
Color Space: S-Gamut3.Cine/Slog3. I found it better than Slog2 as it renders better underwater colors especially the blue water background.
White Balance preset 5500 (can not be changed in Cine EI mode which is a convenience compared to continuously and manually setting WB. (Lights are used most of the times)
No color filters are used on lenses.

Lenses used:
Zenunderwater 200mm (8") dome all the times - no other ports were used even for close-up shots
Sigma APS-C 17-70mm f2.8-4.0 (OS) with MC-11 adapter for E-mount. This is my dominant lens hence it shoots wide enough (around 26mm FF equivalent) and can do very good close ups (1:2.9);
Canon EF 16-35mm f4.0: I like using this instead of the f2.8 hence it has optical stabilization (f2.8 with speed boaster)
Canon EF 100 mm 2.8 (one dive for some close-ups)
The Canon lenses are paired with Metabones speed booster

Lighting:
BigBlue 5000 lumens were used at second level from highest setting. I have installed the yellowish filters that come with the lights all the times. The lights were used in closeups to medium shots (most of the times). This is my first time shooting with lights. I found them very useful for retaining good colors and helping the camera achieve a better dynamic range while using Slog3. The lights also made my editing quite easier and faster.

Sealux Housing:
SeaLux in general makes good quality housings at good price point. I had my first EX1 housing from them before. Hence the Sony EX1 has a built in lens and was mostly used used in autofocus mode, my previous sealux housing experience was good.
The FS7 housing was made for changeable lenses and I never had a housing for such exchangeable lenses before to bench mark. However, I found the whole process of setting up lenses and changing them is counter intuitive. Once this difficult setup is done the housing is ergonomic and usability is fine. Both the focus and the zoom nobs feel and operate well underwater.
I do not want to sound harsh on the company, but honestly the housing that I received seemed to me like a prototype more than a finished product. I had to modify the lens gear to make it fit my initial lens setup - Canon 16-35mm f2.8 LII.
I also had to make a new smaller gear inside the housing replacing the existing one to ensure enough distance between the focus and the zoom ring gear on the lens (2-3mm).
The lens focus rings is made of good stiff plastic which is glued on a plastic barrel sleeve. It is not easy to fit the lens in the barrel due to protrusion on the lens. I have seen other companies do it more intuitively. If you are not going to have to remove it frequently, it is a workable solution.
One big disappointment for me was the removal of the electronic controls from the housing despite the fact that it was advertised when I made my purchase. Sealux responded back to me saying it was not useful to conclude. Actually sony LANC is quite a handy control as a back up in case one of the essential manual controls such get jammed (such as the record button). In addition, it ensures that the housing can be future proof. My friend Sultan, had a sealux housing that he used for 3 different sony cameras with similar size over many years.
One more little source of annoyance, is the lack of feedback on the record button. There is no tactile feedback when pressed. I missed important shots because of that. The small 3" screen on the FS7 doesn't help seasoned divers :( much as well in this regard. If you guys are still contemplating to buy the housing, I can do a little video showing how the setup is put together.

On the positive side, once the housing is setup and balanced with a bit of lead. It is quite stable and functional in the water.

Finally, If you are a professional who is paid for such a setup and looking to house the FS7, it might be worth the investment. (Note about FS7 mark II - the new lens locking mechanism might not work with the housing. Please check with Sealux)

I hope that sealux take such constructive criticism positively. We need them to improve and flourish in one of the smallest economies which is meant to serve the biggest part of planet earth: the oceans :)


#381391 Sony PXW-FS7 underwater

Posted by thani on 10 February 2017 - 04:50 AM

Hi guys,

Finally I had time to finish the video.
https://youtu.be/oLvR2G0zVoI


#380308 Sony PXW-FS7 underwater

Posted by thani on 06 January 2017 - 09:15 AM

Hi Ante,

I am currently experimenting with the FS7 in a Sealux housing and have done a recent trip with it. I will posting a video in a week or so.
I have used the Sealux Sony EX1 housing before and the build quality was good. Altough the FS7 housing is a good value for money, I have some reservations. I will be shedding light on the usability of the housing later.
The camera itself is good especially if used with lights and Slog3 hence you can edit the footage easily. But the whole setup is quite heavy to move around on land. I was using a wheelbarrow to carry it around on the island. In the water it is quite balanced (it needs extra weight ~ 2kg to balance with an 8 inch dome). I'll post my feedback on the setup after posting the video. My advise is not to rush and invest in such an expensive setup hence this year new cameras are coming to market with hopefully a 422 10 bit internal recording such as the GH5.


#363545 18 Years - A Story of a Broken Curse

Posted by thani on 24 July 2015 - 10:47 AM

Gorgeous. And the divers in some of the shots gave perspective on the shear size of those beautiful mantas.


#353659 Help! I'm going blind

Posted by thani on 24 October 2014 - 02:21 AM

Hi guys,

I was thinking of the same prescriptiondivemask but then I run into the disposal contact lenses for close reading. You just wear one in one eye off course :) and it takes a bit adjusting to it.
It works and now I always wear one when shooting. As a refrence I use it with Blackmagic 2.5k & 4k cameras.

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