Tagged with balance - Personal View Talks

A7s white balance issue after motherboard replacement

sp4rk — Tue, 21 Jan 2020 06:55:35 +0000

I had to replace the dead motherboard of my a7s. It works fine, except the white balance is off. I have to go up to 9900k to have daylight white. 5600k looks blue, like 3200k... Does anyone have any idea? Is it possible that the sensor WB does not match the menu settings now?

Steadicam balancing and operation tips

jimtreats — Thu, 25 Aug 2011 17:08:29 +0000

Hi folks.

Last night I got my first steadicam in the mail.

The budget flycam nano, I didn't expect too much, and I think I'm relatively happy for a cheap first steadicam. It did arrive with a few niggles, the bottom weight holding platform was a little bent, meaning the pole coming out of it wasn't perpendicular to the platform. I wasn't sure whether this would cause a problem, but i've bent it into shape of sort now. After this I experienced the problem where with the cam sort of balanced it would hang vertically with the camera pointing away from me, spin the camera any other way and it would always fall to the right a little. In the end i took apart the gymbal bracket and reattached it with even torque on both screws and i seemed to have improved this symptom mostly.

As a whole, the flycam nano does seem ok.. balancing is a bit of a chore but I think i can get close fairly quickly. I'm finding the handle a bit frustrating, the grip rubber can shift in certain orientations which always makes me a bit nervous. I also find i have to hold the handle very low down so my hand doesn't contact with the v bracket that holds the gymbal and stops it from flying properly. I brought the arm brace with it too, which helps with the handle holding a little, but in general i do wish the handle was an inch or two longer.

Now i'm left with a reasonably balanced flycam nano, with my GH2 and 20mm f1.7 lens. I've managed to balance this with only 2 weights on either end of the platform. Which leads me to the first question. To get this to balance i've had to extend the weight platform to about halfway down the pole extension. So I wonder, is there a rule for how much weight to put below, or does more weight with less extension have the same properties as less weight with more extension?

I've been working with a 2-3 seconds drop time from horizontal, i've seen various recommendations on this, i've noticed the slower this drop time the less pendulum-esque the steadicam behaves when you're flying it.

I've seen mention of static and dynamic balanced. I'm not clear on how to verify whether or not I have achieved dynamic balance, i'll assume static is sufficient for the steadicam to remain vertical when placed there, in all camera y-axis rotations.

Whenever I see video of folks showing a balanced steadicam they always shift it forwards, back, left and right with it remaining pretty vertical and stable. I can do this, however when i do do this I find that the camera tends to spin on its y-axis a little. Related to this if i'm walking with the steadicam and i change direction the same rotation can occurs and has to be combatted with the other hand damping the vertical post or even turning it back the desired direction. Is this the behaviour of a balanced steadicam, or a symptom of one that's not quite balanced, or perhaps has an over lubricated gymbal? I'm wondering if the compact nature of the GH2 and 20mm lens is meaning that it doesn't have a very large or dense z-axis which is meaning that its moment of inertia in that axis is so small that its easy to rotate as i've just described.. So i'm wondering if i balance it with a heavier and longer 14-140mm lens I may find it is less likely to turn.

I guess that's about it. Any help or advice would be really appreciated! I accept that it's going to take a lot more practice, but i just want to get a feel of whether i'm in the right area.

Cheers

GH4 External Vlog White Balance Metadata

club_irate — Tue, 30 Aug 2016 02:00:21 +0000

Is there a way to view the precise Kelvin reading of GH4 footage in Premiere Pro CC metadata or any other software? The DP shot in varied White Balances in V log External & i need to be able to get the accurate temperature data of the footage he shot on.

Also, i am using Filmconvert (GH4+VLOG) to grade. The WB parameter (in Film Convert) is an offset rather than a setting in my past experience. Would it then actually wreck my clip if i dialed the Film Convert WB parameter over to 3200K from it's default position on Daylight if the footage was shot on 3200K too?

GH4 2-axis digital level is wrong

Steven — Thu, 27 Nov 2014 19:18:23 +0000

I got my new GH4 from B&H yesterday and the 2-axis digital level is incorrectly reporting the horizon level. If I set it on a table, it reports the horizon level as being somewhat off balance while the GH3's level is proper. I tried resetting everything and the problem, defect, or glitch still exists. I believe the firmware version is 1.1; if there's a newer one, I could try updating, but I have doubts it'll fix the problem. Has anyone experienced this problem? Any suggestions? It looks like I may have to send it back and exchange it for a replacement.

Custom WB with BMCC Speedbooster is a bad idea on GH4

0range — Mon, 28 Jul 2014 14:50:51 +0000

This little bastard...

I now own 3 cameras. The GH2, BMPCC and the GH4. For the Blackmagic I bought the BMCC Speedbooster, so I can use it on the BMPCC and the GH4, if I would buy it any time soon. And I did - today. Excited about the Speedbooster working with my Nikon Glass and getting away with no vignetting in UHD mode (crop factor 2,3 becomes 1,472 like APS-C), I just wanted to give the Custom White Balance a try, since I had to dial in the correct color temperature on the BMPCC, I wanted the luxury back, to have the right settings at the push of a button.

So I was just about to flex my finger and set Custom WB... when I remembered... my GH2 always using the mechanical Shutter, when taking the custom WB. Cause I want to use the GH4 a little longer, I dismounted the BMCC Speedbooster and took the Custom Whitebalance.

Long story is short: Even with activated Electronic Shutter, the GH4 still uses the mechanical Shutter for Custom White Balance and can be damaged with attached BMCC Speedbooster. Since the SB touches the inside of the Shutter Casing and even leaves a mark there due the pressure of the adapter, when it´s attached.

So better stay with the Blackmagic way of dialing in the color temperature or use your MFT Kit Lens - if you own one - to do the work.

By the way.... am I the only one who sets custom WB? Cause I didn´t read about this issue anywhere else. At least the BMCC Speedbooster Users don´t care much about it and stick with automatic WB ;-)

That´s it for today!

Cheers from Austria! Stefan

Varavon slider balance weight

Vitaliy_Kiselev — Tue, 30 Oct 2012 23:23:19 +0000

Available at:

http://www.personal-view.com/talks/discussion/5505/special-deals-jibs-cranes-dollies-sliders#Item_3

GH2 WHITE BALANCE AND OUT-OF-BOX SETTINGS

jasantana — Fri, 04 Jan 2013 01:40:01 +0000

HERE: http://www.eoshd.com/content/599/tips-and-tricks-for-making-panasonic-look-more-like-canon - I've found this quote, to do with "improving" on the GH2'S default White Balance settings:

"The Lumix sensors are also all a bit predisposed to green at the expense of warm reds, yellows and oranges. Energy saving lightbulbs especially don’t help, since these have a green cast and the GH2 exaggerates it.

On any white balance preset (even auto) that you intend to use, customize them so that the notch in the color chart is two steps toward yellow (on the left) and 1 step down toward Magenta. Don’t go any further than this because it will give whites a pink cast. This compensates for the green cast, and warms the auto white balance preset slightly to remove the grey and neutral color tones. This will give you much stronger results indoors, in studios and render sunsets and evening skies in a much more lifelike way with deep scarlets and oranges rather than pathetic yellowy greens!"

If true, as a general question, does this still hold true when using the various custom created settings? Again, if the above is true, do the custom settings take this into account and so one should put use the GH2's default White Balance?

I hope I asked that right.

Thank you

Lumix GH series and auto white balance problem

simurg — Sat, 21 Jul 2012 08:32:59 +0000

I'm shooting in the woods. In automatic mode the colors faded. I think the light green color is the reference camera. What can I do for the most accurate colors. What is the best method of setting white balance for GH1 & GH2?

Fine tuning White Balance in multicam

DrDave — Tue, 06 Mar 2012 14:58:28 +0000

Here's my question--I have six cams, all white balanced to the same card, and the color is always ever so slightly different. Of course light does not reflect uniformly, so there are always small differences. Is there a way to tweak the cams color so they match better other than by eye and trial and error? For example, is it worthwhile to sample a patch of a blue shirt in two cams and see what the difference is in Adobe Premiere Pro?

Color shift mid recording

eyefi — Fri, 03 Feb 2012 12:51:42 +0000

I tried today the following settings:

.Patch: quantum 100

.iso 640 (down from 800)

.kelvin 6300

.24h

.standard -2,-2,0,-2

.shutter 40

.lens 14-140.

.AFS - continuous AF off

.OIS on (1)

.Tripod: Camera locked

late afternoon indirect natural light, indoors. grain and noise was constant and pleasing. Color was great and faithful...

But: In the middle of the shoot (two and a half mins in) after a pink shirt appeared on 1/5th of the frame, the image turned greenish, specially on the skin tones Mids.

this samples are two frames apart. direct screenshots from quicktime with avc plugin for playback of mts file.

I've also noticed this almost a year ago in a shoot, using original firmware. In a scene where yellow was background and blue and pink elements appeared in the foreground while panning. kind of like the pink shirt that comes in and out of the frame.

In this case it never goes back to normal up to the end of the clip, up to 5 minutes, the shirt keeps coming on and off frame every 10 seconds.

Anyone noticed this? It looks like although everything is locked the codec is performing some kind of auto white balance adjustment?!

I'm aware of the possible color shift in the first few seconds after you start recording, but this is different.

I've posted this on another thread but it was out of place.

I appreciate your input.

thanks