ADJ Dotz Par Light - Camera Flicker Test at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Photon Management

Photon Management
Shine an ever-loving light on you.


Reply
 
Thread Tools Search this Thread
Old September 3rd, 2014, 04:20 PM   #1
Regular Crew
 
Join Date: Mar 2009
Location: Portland, OR
Posts: 178
ADJ Dotz Par Light - Camera Flicker Test

This is a follow-up to my test last week of the ADJ "Mega TriPar Profile" fixture, which exhibited flicker on-camera when any of the RGB channels were dimmed below 100%.

Original post:
ADJ Mega TriPar Light - Camera Flicker Test

Now I've acquired the newer, brighter "Dotz Par" fixture, which is advertised as being "Flicker Free (No Flicker on Camera)". While there is still a subtle, undulating flicker under certain conditions (and it can be made worse using the included beam narrowing lens/filter), it is a significant improvement over the previous fixture. Whether it is good enough for your production is something you'll have to evaluate, the problem is not invisible and it could be noticeable in a final product.


(DOWNLOAD THE ORIGINAL or watch in HD 1080P to best see the effect being tested -- the extra compression via Vimeo masks much of the flicker as macroblocking.)
Bob Richardson is offline   Reply With Quote
Old September 14th, 2014, 05:48 AM   #2
Inner Circle
 
Join Date: Feb 2009
Location: Brisbane, Australia
Posts: 2,257
Re: ADJ Dotz Par Light - Camera Flicker Test

The originally uploaded file is not available for download. Had you uploaded via Dropbox?

Can definitely see the flickering effect, though.

Andrew
Andrew Smith is offline   Reply With Quote
Old September 14th, 2014, 05:55 PM   #3
Regular Crew
 
Join Date: Mar 2009
Location: Portland, OR
Posts: 178
Re: ADJ Dotz Par Light - Camera Flicker Test

Thanks for pointing that out... I see that the original file isn't available via Vimeo. Apparently if it's over a certain size (I used a very high bitrate to show the effect), they delete it after the initial conversion. Glad you could see the effect anyway. It is partially obscured by compression.
Bob Richardson is offline   Reply With Quote
Old September 14th, 2014, 06:34 PM   #4
Inner Circle
 
Join Date: Feb 2009
Location: Brisbane, Australia
Posts: 2,257
Re: ADJ Dotz Par Light - Camera Flicker Test

What data rate are you encoding at?

Andrew
Andrew Smith is offline   Reply With Quote
Old September 14th, 2014, 06:41 PM   #5
Regular Crew
 
Join Date: Mar 2009
Location: Portland, OR
Posts: 178
Re: ADJ Dotz Par Light - Camera Flicker Test

It averages about 25Mbits/sec H264. Exorbitant for web video, I know, but it was the only way to get the re-compressed version on Vimeo to really show what was going on, and uploading at lower bitrates sometimes caused Vimeo to disallow the 1080P option. The original camera recordings are 24MBit AVCHD so in that sense it's not too far off, and of course a ProRes export at up to 100MBit shows everything quite clearly. But in any case I'm glad the point got across with the final result.
Bob Richardson is offline   Reply With Quote
Old April 4th, 2015, 06:25 PM   #6
New Boot
 
Join Date: Nov 2013
Location: DC
Posts: 8
Re: ADJ Dotz Par Light - Camera Flicker Test

This is very informative. I had my eye on the older unit, but I've decided against them now that I can see how bad the flicker is. Thanks!

I'm trying to get a feel for how bright these are. Are you using them alongside "real" video lights, or just room lighting? Any chance you can stick a light meter in front of one of them at full white? I want to see if they could be used as a background wash alongside Litepanels-style lights. Alas, the manual provides no sort of brightness rating.

(I hope I'm not being too necromancy-ish; I suppose this thread is a little old at this point.)
Nick Piegari is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Photon Management

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:20 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network