Jump to content

Kino Flo Heavy Magenta Tint


Jingtian Wang
 Share

Recommended Posts

While looking back at still grabs of today's shoot. I found shots to have a heavy magenta tint. This is very obvious in the first shot, and more subtle in the second. The shot is lit by a 1x2 kino and a 2x2 kino, both with k55 bulbs. I rented the light from a reputable rental house and the chances of anything being a knock off is very low; the fixtures and bulbs seemed fairly new to me but I can't tell for sure.

The camera is white balanced correctly and rooms lights are turned off. The camera I used is a Panasonic Hcx 1000e. 

One potential cause might be my laptop screen as the shots seemed normal ona small HD 502 (I was told it is new, no idea whether calibrated), but it can also be the other way around. And I also wasn't most focused on the colors during this shots

Any inputs is appreciated.

J

p.s faces were blurred for obvious reason.

Link to comment
Share on other sites

11 hours ago, David Mullen ASC said:

Was this the regular T12 Kino bulbs or the smaller bulbs like in a Diva?

These were 242-k55 tubes.So the 2 pin version, unless I remember wrong, these were the original kinos tubes.

Capture.PNG

Edited by Jingtian Wang
Link to comment
Share on other sites

This is what I thought, and why this surprised me so much. 

I later realised it might be caused by bad black balance. So I re-balanced that took this shot. But same thing. This seems to only appear on the daylight bulbs and the tungsten seems fine to me. 

Magennta.jpg

Link to comment
Share on other sites

  • 2 weeks later...

Kino Flo lights have a tendency to go magenta when old or dimmed down. If you used two instruments it’s possible that you white balanced to your key and the backlight went way pink, most likely because you dimmed it significantly but perhaps because the tube is just old. If your subject isn’t particularly pink but the background is then I would assume this is the case.

Even through the distortion it looks to me like the subject may be balanced correctly. Is this possible?

Edited by Stef Allan
Link to comment
Share on other sites

On 2/12/2020 at 12:14 AM, Stef Allan said:

Kino Flo lights have a tendency to go magenta when old or dimmed down.

That shouldn't be the cause as dimming wasn't even a option on the units I had (2x2 and 2x1 with separated ballast)

 

On 2/12/2020 at 12:14 AM, Stef Allan said:

but perhaps because the tube is just old

This sounds like the most plausible. The tubes had 2015 on there as their manufacture date. Not sure if this is considered old for Kino tubes?

Link to comment
Share on other sites

  • Sustaining Member

There's one minor point that may not apply, but is worth mentioning in this context for future reference.

Some kino-flo ballasts offer switches selecting between two- or four-foot tubes. Sometimes this is used (abused) to provide a degree of brightness control, to reduce output on the common four foot tubes. This will cause a minus green error just as with conventional dimming.

P

Link to comment
Share on other sites

10 minutes ago, Phil Rhodes said:

Some kino-flo ballasts offer switches selecting between two- or four-foot tubes. Sometimes this is used (abused) to provide a degree of brightness control, to reduce output on the common four foot tubes. This will cause a minus green error just as with conventional dimming.

I actually intentionally did this for my most recent shoot. Those Kino ballasts offer so much flexibility for such an old technology.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

Forum Sponsors

Abel Cine

Tai Audio

New Pro Video - New and Used Equipment

Gamma Ray Digital Inc

Broadcast Solutions Inc

Visual Products

Film Gears

Wooden Camera

Metropolis Post

Glidecam

Serious Gear

VidGear.com - Broadcast Video Warehouse

FJS International

CineLab

Cinematography Books and Gear



×
×
  • Create New...