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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

The Gentleman's Underwater Bubble Blower Thread

Tom Hamilton said:
http://www.flkeysnews.com/news/local/article141115168.html
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Sad as the loss is, these lawsuits happen every time -

Sotis seems a little sketchy from that report but I kind of agree with the first reply to that article - Rob was an experienced diver and had to know that he was really pushing beyond safe limits - and short of an actual equipment malfunction due to a manufacturer defect I think the responsibility for what happened has to sit with Rob.





"Forrest Goodbar (replied to the article)
As much as I respect admire and dread the loss of this film maker, conservationist and fellow diver, as a technical diver and especifically a Diver using a rebreather unit, he is responsible for ensuring his equipment, gas supplies are correct for any dive he is attempting and his dive profiles are with in his limits. Decompression diving and deep (pass recreational depth) diving is a specialty and should only be attempted by those specifically trained in the activity. They know the risks!

Now dont get me wrong, I am not supporting Sotis or his company or in fact any of his past actions or activities.

"The men were on their third dive that day filming the next installment of Stewart’s Sharkwater documentary series about the importance of shark conservation. Deep-sea diving using rebreathers is risky, but three such dives in one day is considered pushing the envelope, even among many of the most experienced divers. "
 
Ron Lagerlof said:
Inappropriate you guys. Take it somewhere else, or shut it down. Let Reduser be about Red users...
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Sorry to offend anyone (wasn't he a Red user?)

My point really was a general one in that diving is an inherently dangerous sport and especially when pushing the limits I have always felt that one needs to be personally responsible for the situations they get into and that while the lawsuits are inevitable they usually don't have much merit.

If you feel it was truly inappropriate I can delete the post.
 
Ron Lagerlof said:
Inappropriate you guys. Take it somewhere else, or shut it down. Let Reduser be about Red users...
Click to expand...

Bob Cranston's passing was mourned, his astonishing life and film making career celebrated by many in these pages. Rob died in the service of his art, his accomplishments huge in their own right, he should be accorded the same profound respect. It is here on these pages, with certainty, most appropriate.

The underwater shot is an art form, a highly technical one, and comes with many hazards and dangers, and as Mike rightly states, to be ignored at one's peril.

I will agree with Ron, however, the sordid legal aftermath in this case should be relegated to another place.
 
Tom Hamilton said:
snip:
I will agree with Ron, however, the sordid legal aftermath in this case should be relegated to another place.
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ummm... who posted the article?:001_rolleyes::wink5:
 
This is already up on the Recon thread but since there is a good bit of underwater work I thought I would post here as well.
Our new RED Collective on Paul Nicklen and Sea Legacy
https://www.youtube.com/watch?v=AynwM6tArWA

I had such an incredible time following Paul around through the woods and under the surface of the beautiful Salish Sea. Especially trying to frame up a decent shot while I'm getting the crap kicked out of me by those friendly Stellar Sea Lions :)
 
That is a fantastic piece Sean, congrats!

Sea Lions are hilarious critters, rambunctious bandits of the sea, steal your stuff and swim away laughing, really amazing you filmed Paul's connection with them.
 
Thanks Tom! Those Stellars were a trip. I'm more used to the California Sea Lions who seem much more skittish and jumpy, although at times still interactive. But those bigger Stellars were straight up confident thugs ;) You give them an inch and they will pin your ass to the ground and start ripping shit up. So much fun though. I am in love with the Salish Sea and can definitely see myself moving the family to Vancouver Island some day. Absolutely magical part of the world.

Here are a few (very one-sided) :\ bts pics from the shoot: http://nateandsean.red.com/post/159809284118/a-few-behind-the-scenes-iphone-pics-from-the-paul
 
Wow!! So crazy! So gorgeous! That moment at 0:50 is pretty mind blowing.
 
Hi I'm selling a couple of port extenders for the Gates Deep Weapon/Dragon housing if anyone is interested. More info on the Marketplace thread here.

Cheers
 
Reddish bands with Magic Filter and Sigma 15mm f2.8 fisheye

Reddish bands with Magic Filter and Sigma 15mm f2.8 fisheye

I’ve done some video test shoots using a RED Weapon 6K and a Sigma 15mm f2.8 fisheye lens.
The filter was the Magic Filter, placed at the rear lens filter holder and the WB measure was taken, at the shoot depth and at the same shooting angle that the image was taken, using a 18% grey card.

No lights were used.

No problems with the procedure but all the clips shows two reddish bands at both sides of the footage. This happened no matter the depth and no matter the shooting angle relative to the sun. Picture attached.

Anyone had seen this happening before? Any clue of what can be happening?

Thanks!

Cheers,
 

Attachments

  • Magic Filter reddish bands.jpg
    Magic Filter reddish bands.jpg
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My guess is CA due color separation/focus issues at extreme edges of image. Fisheye behind a dome port, plus a 6K sensor, puts you right out at the image plane curvature frontier of what's possible re uw imaging. The red spectrum may also be the sunlight reflectivity of the sandy bottom.

Some possible tests though, I'm sure you are aware of, but;

Check nodal point to dome port positioning. Gross alignment errors can cause that.

Shoot a 5K/4K image in same conditions, see if it's still there.

Shoot a 6K clip behind a flat port, still there? If so, that is a sensor issue.

Does an MTF chart for this lens exist? If so, compare that to a known stellar uw performer, such as the Canon 11-24, that should reveal some answers.

Please let us know what you find, thx.

Cheers

PS Graeme Nattress and Stacey Spears are probably to two top minds here re this issue.
 
This filter, this lens, and this port are used routinely on larger DSLR sensors from Nikon, Canon, and Sony without this issue.

Rui - what OLPF? I'll try to recreate this, and try some other filters. I've done a lot of work recently with prototype filters that do similar, but more aggressive and selective filtration, and have not seen this issue on 8K Helium w/ H2O or STD OLPF. I admit to almost never using filters with Dragon, I wasn't comfortable cutting available light.

Are you only seeing this color shift in water, or is it apparent in air as well?
 
Tom Hamilton said:
My guess is CA due color separation/focus issues at extreme edges of image. Fisheye behind a dome port, plus a 6K sensor, puts you right out at the image plane curvature frontier of what's possible re uw imaging. The red spectrum may also be the sunlight reflectivity of the sandy bottom.

Some possible tests though, I'm sure you are aware of, but;

Check nodal point to dome port positioning. Gross alignment errors can cause that.

Shoot a 5K/4K image in same conditions, see if it's still there.

Shoot a 6K clip behind a flat port, still there? If so, that is a sensor issue.

Does an MTF chart for this lens exist? If so, compare that to a known stellar uw performer, such as the Canon 11-24, that should reveal some answers.

Please let us know what you find, thx.

Cheers

PS Graeme Nattress and Stacey Spears are probably to two top minds here re this issue.
Click to expand...

Hi Tom,

With the same lens and dome port combination there is no issue at all. The problem only happens when I add the Magic Filter. So I'm quite sure that the problem is not with the sensor, dome port placement/curvature or camera resolution.
The reddish area remains the same even when the camera is pointed towards the open water, so it's not also a sand reflection.

If I shoot at 5K/4K, due to sensor crop, there is no issue, but I'm testing it to use in full 6K resolution.
Didn't try it with a flat port (because it's a fisheye lens), but I will do some dry tests very soon, without any port at all.

I'll post the conclusions.

Thanks!
 
Ryan Canon said:
This filter, this lens, and this port are used routinely on larger DSLR sensors from Nikon, Canon, and Sony without this issue.

Rui - what OLPF? I'll try to recreate this, and try some other filters. I've done a lot of work recently with prototype filters that do similar, but more aggressive and selective filtration, and have not seen this issue on 8K Helium w/ H2O or STD OLPF. I admit to almost never using filters with Dragon, I wasn't comfortable cutting available light.

Are you only seeing this color shift in water, or is it apparent in air as well?
Click to expand...


Hi Ryan!

Yes, you are right and it's also a new problem even for me.
I'm using the standard OLPF.

I'm interested to know what kind of filters are you testing and in a general manner what filters do other members use with good results.
I'm also not a big fun of filters (I prefer strong artificial lights) but there are some situations when it's almost inevitable to use them in order to achieve good color. Also natural light is less prone to scare some subjects away :-)
I also hate the light loss with filters :-(

So far I've test this only underwater. But I will do some dry test in air too, this afternoon, to see if it happens also in air.

I'll share the results soon.

Thanks for your input.
 
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