Jump to content


Photo
- - - - -

BlackMagic Cinema Camera underwater custom housing

BMCC undrwater housing

  • Please log in to reply
48 replies to this topic

#1 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 22 June 2013 - 04:04 AM

Dear All,

 

Sultan has received his BMCC EF mount and decided to take it downuder. After his Ninja2 house building experience, this time he as done a full fledged housing.

Offcourse the ports are borrowed from his existing housings.

Here are some specs:

> Housing is machained form aluminum cast;

> space to accomidate external battery;

> Follow focus is used to make focusing smoth and fast;

> Manul cotrols: Power on/off, Record, Iris (auto only), Focus;

> Flat port for Macro;

> Fathom 110 port (yes it works and wide enough to compensate for the 2.4 crop factor)

> Tested so far to 165ft by Sultan to check the behavior of the controls underpressure. We are sure it can go deeper

 

 

He has tested it with the Canon EF lenses: 16-35mm wide angle and 100mm macro.

 

Unfortunately, the waters here in summer we have bad visibility and does not help in the testing. Actually, it is like a sand storm down there - really bad.

I will be posting sample jpg images of the captured video later.

 

Here is an image of the housing with the Fathom lens:

 

 

 

 

Attached Images

  • SultanBMCC_CustomHousing.jpg

Best Regards,
Thani

#2 Steve Douglas

Steve Douglas

    Humpback Whale

  • Industry
  • PipPipPipPipPipPip
  • 2842 posts
  • Gender:Male
  • Location:San Diego
  • Interests:filming/editing/exotic travel. l write reviews of editing software, books, tutorials and Mac based NLE related products for the www.kenstone.net and www.lafcpug.org sites as well as articles for Asian Diver Magazine and wetpixel. I am one of the founding members of the San Diego UnderSea Film Festival

Posted 22 June 2013 - 09:36 AM

There's some promise to this endeavor


www.kenstone.net
www.lafcpug.org

Steve Douglas
steve-sharksdelight@cox.net

I have worked as an unpaid reviewer for the editing websites since 2002. Most all hardware and software is sent to me free of charge, however, in no way am I obligated to provide either positive or negative evaluations. Any suggestions I make regarding products are a result of my own, completely, personal opinions and experiences with said products.


#3 MJvC

MJvC

    Wolf Eel

  • Member
  • PipPip
  • 131 posts
  • Gender:Male
  • Location:Cape Town

Posted 22 June 2013 - 10:10 AM

I totally agree this looks like a really good solution to give a wider angle of view on they small sensor. Could a similar solution work with the pocket cinema camera with a smaller Fathom port.

#4 SimonSpear

SimonSpear

    Orca

  • Member
  • PipPipPipPipPip
  • 1390 posts
  • Gender:Male
  • Location:London, UK

Posted 22 June 2013 - 04:26 PM

Let's see the jps's Thani! :)



#5 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 23 June 2013 - 07:37 PM

Hi there,

I am on a short trip - no a diving one unfortunately :( - and I hope these images make it through.
First a disclaimer :): I am not aquatinted with Davinci Resolve nor I am good at color grading.

Simon, here are some compressed Sample for the wide angle fathom along with the 16-35 canon EF lens. The lens was sat at 16mm:

Attached Images

  • image.jpg
  • image.jpg

Edited by thani, 23 June 2013 - 07:38 PM.

Best Regards,
Thani

#6 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 23 June 2013 - 07:41 PM

One more wide angle fathom along with the 16-35 canon EF lens. The lens was sat at 16mm:

Attached Images

  • image.jpg

Best Regards,
Thani

#7 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 23 June 2013 - 07:44 PM

Sample for Macro shots using the canon 100mm macro with a flat port:

Attached Images

  • image.jpg
  • image.jpg

Best Regards,
Thani

#8 jonny shaw

jonny shaw

    Orca

  • Member
  • PipPipPipPipPip
  • 1315 posts
  • Gender:Male
  • Location:Sydney

Posted 23 June 2013 - 07:53 PM

Are they zoomed in or cropped?


www.ginclearfilm.com
www.facebook.com/ginclearfilm
GATES DEEP EPIC Based in Sydney


#9 CheungyDiver

CheungyDiver

    Tiger Shark

  • Industry
  • PipPipPipPip
  • 625 posts
  • Gender:Male
  • Location:Singapore
  • Interests:Lots. I take things apart, modify things and make things.

Posted 23 June 2013 - 08:42 PM

Thanks Thani

 

Do you have a full HD still? These looked low res.


Proprietor of Scubacam, Singapore. Commercial videocameraman. Also shoot digital stills. I modify and built stuff. I love technology. Camera: Red Epic/ Scarlet and soon Dragon

Email: info@scubacam.com.sg

http://www.scubacam.com.sg/


#10 r4e

r4e

    Wolf Eel

  • Member
  • PipPip
  • 141 posts
  • Gender:Male
  • Location:Southern Finland

Posted 23 June 2013 - 09:05 PM

Congratulations for being one of the first to take this camera under water.

 

> Fathom 110 port (yes it works and wide enough to compensate for the 2.4 crop factor)

 

The Fathom is an excellent port. However, I do not quite understand how it "compensates" the crop factor. If the BMCC sensor has a 2.4 crop factor, wouldn't a Canon 16-35mm zoom be equivalent to 38-84mm? I might be wrong, but the sample pictures do not look ultra-wide (weitwinkel).

 

The hopefully-soon-to-be-released BM 4K production camera has a crop factor of about 1.7 and even that makes the Canon 16-35mm equivalent to 27-60mm.

 

I wonder would the EF-S series work with the BMCC under water. EF-S 10-22mm would provide a wider view angle.

 

http://forum.blackma....php?f=2&t=3807


vimeo.com/r4e

http://www.cerella.fi for the Underwater Photographer and Videographer

 


#11 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 23 June 2013 - 09:12 PM

Jonny, non of the shots are cropped. Not the wide angle nor the macro ones. The lion fish in the fishing trap is a close up with the fathom port and the lens is at its widest 16mm.

Thanks Thani
 
Do you have a full HD still? These looked low res.


Yes, each is almost 2k more than allowed by the forum.
Best Regards,
Thani

#12 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 23 June 2013 - 09:28 PM

The Fathom is an excellent port. However, I do not quite understand how it "compensates" the crop factor. If the BMCC sensor has a 2.4 crop factor, wouldn't a Canon 16-35mm zoom be equivalent to 38-84mm? I might be wrong, but the sample pictures do not look ultra-wide (weitwinkel) (weitwinkel).
 


The Fathom was designed for the Sony EX1 which I think has a 35mm equivalent. This is why it looks like it is working at around 38mm. More testing needs to be done.

I am hopping the 4k will have some wide angle primes that will give us close to 12 to 16 mm. I will do some search ... :)
Best Regards,
Thani

#13 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 26 June 2013 - 02:44 AM

Here are some pictures of the housing that shows few controls the focus, record & auto iris.
The round long "view-finder like" is a good way to protect the screen from the ambient light. The screen looks clear and bright all the time. It works better than any shade I have used before. I wish it was square :) but this is what Sultan has in his reusable stock.

I would advise any manufacurer to avoid the standard shades that are closely attached to the back of the glass which is close to the screen. It is better to have the screen deep enough in the housing away from any light and have a small shade long enough to show the full screen :)

Another good idea is to avoid the standard housing design that follow the shape of the cam/lens. That would be okay for taking stills but not good for continuous video capture. A more stable rectangular shape would be preferred.

Attached Images

  • image.jpg
  • image.jpg

Best Regards,
Thani

#14 Drew

Drew

    The Controller

  • Video Expert
  • 10642 posts
  • Gender:Male
  • Location:GPS is not reliable in South East Asian seas

Posted 26 June 2013 - 12:49 PM

Thani, you and Sultan are pretty resourceful in your thinking. :)  I love housings that are somewhat universal.

 

The EX1 is 31.4mm (35mm equiv) and has a lens diameter of 77mm (filter size).  The 16-35 II (I assume you are using the II) has 82mm diameter.  However, since the crop factor is 2.4, there's no vignetting with the SWP44C (or Fathom 110 in Sealux speak).

 

Why don't you try the 8-15 fisheye behind a dome port? That should give you about 19mm fisheye FOV, which should be around  130°, albeit barrel distorted.  Or even the 8-16mm?


Drew
Moderator
"Journalism is what someone else does not want printed, everything else is public relations."

"I was born not knowing, and have only had a little time to change that here and there.


#15 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 26 June 2013 - 07:59 PM

Why don't you try the 8-15 fisheye behind a dome port? That should give you about 19mm fisheye FOV, which should be around  130°, albeit barrel distorted.  Or even the 8-16mm?

Drew,
Where can we find dome ports that could fit the Sealux EX1 like housings with or without an adapter?
I have been looking at:
http://zenunderwater.com/products.php
But did not receive a positive reply from them yet.

Another selly question:
If you have a wide rectangular lens lets say 11 mm and place it in contact with a flat port - no gap - would you still get close to 11mm?
Best Regards,
Thani

#16 CheungyDiver

CheungyDiver

    Tiger Shark

  • Industry
  • PipPipPipPip
  • 625 posts
  • Gender:Male
  • Location:Singapore
  • Interests:Lots. I take things apart, modify things and make things.

Posted 26 June 2013 - 11:28 PM

11mm rectilinear (i assume?)  you will loose 25% of the angle (affect of water to flat glass - refraction)

 

110deg becomes 82 deg or there abouts 


Proprietor of Scubacam, Singapore. Commercial videocameraman. Also shoot digital stills. I modify and built stuff. I love technology. Camera: Red Epic/ Scarlet and soon Dragon

Email: info@scubacam.com.sg

http://www.scubacam.com.sg/


#17 thani

thani

    Wolf Eel

  • Member
  • PipPip
  • 147 posts
  • Gender:Male
  • Location:Dubai, UAE
  • Interests:Water

Posted 27 June 2013 - 08:46 AM

Thanks David.
Just to confirm, even if the lens is stuck on flat port?
Best Regards,
Thani

#18 CheungyDiver

CheungyDiver

    Tiger Shark

  • Industry
  • PipPipPipPip
  • 625 posts
  • Gender:Male
  • Location:Singapore
  • Interests:Lots. I take things apart, modify things and make things.

Posted 27 June 2013 - 10:53 AM

yes. Inside the housing lens and flat port has no effect as both are in air. Stuck or unstuck. Flat port to water is where the 25% magnification occurs. 

 

To keep the angle of the lens a dome that matches the lens optical property is needed. 


Proprietor of Scubacam, Singapore. Commercial videocameraman. Also shoot digital stills. I modify and built stuff. I love technology. Camera: Red Epic/ Scarlet and soon Dragon

Email: info@scubacam.com.sg

http://www.scubacam.com.sg/


#19 Drew

Drew

    The Controller

  • Video Expert
  • 10642 posts
  • Gender:Male
  • Location:GPS is not reliable in South East Asian seas

Posted 30 June 2013 - 09:50 PM

Don't forget the crop factor, 11mm=26.4mm, then + flat port = 33mm or so.  Go for the EFS 8-16 behind a dome port.


Drew
Moderator
"Journalism is what someone else does not want printed, everything else is public relations."

"I was born not knowing, and have only had a little time to change that here and there.


#20 jonny shaw

jonny shaw

    Orca

  • Member
  • PipPipPipPipPip
  • 1315 posts
  • Gender:Male
  • Location:Sydney

Posted 30 June 2013 - 11:47 PM

Also if you go much more than 60 degrees you will get issues with chromatic aberrations through a flat port.

www.ginclearfilm.com
www.facebook.com/ginclearfilm
GATES DEEP EPIC Based in Sydney






Also tagged with one or more of these keywords: BMCC, undrwater housing