blue effect

Andy Lunn · May 7th, 2007, 11:24 AM

Having done some more experimenting, i have found that when i set exposure for say a tree and pan up towards the sky, some of the branches have a strange blue cast around some of the finer twigs. Am i over exposing? is this what is casusing this effect? I noticed it again when i shot inside an apartment and panned past a window.

When you are out and about and shooting, how do you judge the correct fstop? I never know whether I am under/over exposing, is this something that comes with experience? or is a light meter advisable?

And lastly, I am shooting in manual mode, with -3 gain and the white balance set to outdoors, i am still noticing a slight shift in exposure when i move from light to dark areas, is there another setting in the menu I have could of missed?

Greg Boston · May 7th, 2007, 11:37 AM

That blue fringing you see is many times attributed to CCD overload. It has manifested itself on many different cameras at many different levels. You have to be cognizant of those situations that produce this effect and try to work around them.

-gb-

Steven Dempsey · May 7th, 2007, 02:15 PM

There are two ways to deal with this problem.

1. Set your exposure to auto and pan up to the tree and sky very slowly so that the change of exposure is subtle.
2. Shoot in manual and do an iris ramp (this is what I usually do). Basically, as you pan up towards the sky, you close the iris down slowly.

Neither option is ideal but you have to work within the limits of your tools and the dynamic range of video is quite limited.

Andy Lunn · May 7th, 2007, 02:23 PM

Hi Steven good to see you here as well xlcinema. Thanks for the advise, i did find the sky burnt out, I know now why this happens and what to look for, thanks guys.

May 7th, 2007, 11:24 AM	#1
Andy Lunn Regular Crew Join Date: Feb 2007 Location: Leeds UK Posts: 94	blue effect \| over exposure? Having done some more experimenting, i have found that when i set exposure for say a tree and pan up towards the sky, some of the branches have a strange blue cast around some of the finer twigs. Am i over exposing? is this what is casusing this effect? I noticed it again when i shot inside an apartment and panned past a window. When you are out and about and shooting, how do you judge the correct fstop? I never know whether I am under/over exposing, is this something that comes with experience? or is a light meter advisable? And lastly, I am shooting in manual mode, with -3 gain and the white balance set to outdoors, i am still noticing a slight shift in exposure when i move from light to dark areas, is there another setting in the menu I have could of missed?

May 7th, 2007, 02:15 PM	#3
Steven Dempsey Disjecta Join Date: Apr 2004 Location: Seattle, Washington Posts: 937	There are two ways to deal with this problem. 1. Set your exposure to auto and pan up to the tree and sky very slowly so that the change of exposure is subtle. 2. Shoot in manual and do an iris ramp (this is what I usually do). Basically, as you pan up towards the sky, you close the iris down slowly. Neither option is ideal but you have to work within the limits of your tools and the dynamic range of video is quite limited. __________________ Try my Digital Therapy: http://www.pinelakefilms.com/digital_therapy.html Films on ExposureRoom: http://exposureroom.com/members/disjecta.aspx/videos/

May 7th, 2007, 11:37 AM	#2
Greg Boston Wrangler Join Date: Oct 2003 Location: DFW area, TX Posts: 6,117 Images: 1	That blue fringing you see is many times attributed to CCD overload. It has manifested itself on many different cameras at many different levels. You have to be cognizant of those situations that produce this effect and try to work around them. -gb-

May 7th, 2007, 02:23 PM	#4
Andy Lunn Regular Crew Join Date: Feb 2007 Location: Leeds UK Posts: 94	Hi Steven good to see you here as well xlcinema. Thanks for the advise, i did find the sky burnt out, I know now why this happens and what to look for, thanks guys.