color vcast

jimbosloan

jimbosloan

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Name
Jim
Edit My Images
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Hi need some advice

When i do a long exposure shot using my ND filter in daylight i get a color cast on the image
is this because i'm using AWB
should i set in manual to daylight ?

Canon 400d


Thanks in advance

Jim :thumbs:
 
Shoot RAW and adjust it after as different filters give different casts.
 
Like Tom says, shoot raw. It also helps if you have a grey card that you can take a photo of just before/after your shoot. Then you can use that image to get an accurate white balance when you process.
 
BarryDawsib said:
Erm might also be worth looking at the colour cast as some cheaper filters have a colour tint,, often purple.
Click to expand...

It's been my experience that all the high-density ND filters I've tried have had some sort of colour cast. That's B&W, Heliopan and Hitech. Which ones do you think do not have a colour cast?
 
Lcw 9 stopper too.. Slight blue. Super easy to fix in PP.
 
Most, if not all, ND filters have a slight colour cast. Do a custom white balance (see handbook) and keep the reference image on the card so you can reference it at any time. Or correct it in post processing; slight casts can be corrected in JPEGs, but for best results, or if it's strong, shoot Raw.
 
hollis_f said:
It's been my experience that all the high-density ND filters I've tried have had some sort of colour cast. That's B&W, Heliopan and Hitech. Which ones do you think do not have a colour cast?
Click to expand...

Fair point, but a cokin vs an ebay version its easy to see which is worse :D

Have to admit though, being scrutinous you can find it with all :bang:
 
hollis_f said:
Like Tom says, shoot raw. It also helps if you have a grey card that you can take a photo of just before/after your shoot. Then you can use that image to get an accurate white balance when you process.
Click to expand...

Grey card is for exposure not white balance.. you should use something white in the area your shooting to set manual white balance..
 
Can somebody please explain why the most advice is to shoot the scene badly but in raw then fix on the computer... why isnt the best advice to set manual white balance and thus no problem?
 
hollis_f said:
A grey card works for both. Try it if you doubt.
Click to expand...

Sure, any neutral tone is fine. Sometimes grey cards are not neutral though - Kodak isn't, doesn't claim to be (mine's slightly green) but the 90% white side is neutral. Also, there's a danger of getting noise with a grey card especially if you use the dropper in post.
 
KIPAX said:
Can somebody please explain why the most advice is to shoot the scene badly but in raw then fix on the computer... why isnt the best advice to set manual white balance and thus no problem?
Click to expand...

Beacuse with a 10 stop filter you can see b****r all athough the viewfinder to know what the cast will be adjust the white balance. You'd have to take a shot, adjust, take another, adjust if you got it wrong..
Whats the point when you can just shoot one shot in RAW and move a slider to get it right.

Its not the end of the world and doesnt make you any less of a photographer because you didnt arse around manually setting a white balance before the shoot.
 
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