Originally posted by dlh Good idea, that lens cap, @BruceBanner, but for now (seeing as how I'd have to go out and buy a bunch of those otherwise), I'm going to try to do what I want using the custom "K" white balance settings. I reckon you could use a neutral density filter to accomplish the same thing, do you suppose?
I noticed that it's pretty overcast today, so I went out and used the sky directly above to load data into "K1" in both the KP and the K-1. Took some test shots of stuff in the yard, and everything looks perfect. Now, let's see what it does in bright daylight, etc.
See, the thing is, if I take a picture indoors with artificial light, I want the picture to look like it was taken indoors with artificial light. I can change that later if I want to, but an accurate representation is what I'm after. I decide to take a picture because something looks interesting to me - and when it does, it looks the way it looks, and I want the real thing exactly as it interested me to begin with, to appear in the resultant picture.
Thanks for the comments and suggestions, by the way.
Auto WB
always tries to give you an accurate representation of how things really are, that's it's whole purpose. I have for example had Auto WB selected for a bright sunny blue sky Australian day, and then shifted the WB to 'Daylight' and there was minimal to any shift in WB because Auto WB got it right. Same can be said for Cloudy days as well, toggling off from Auto WB to Cloudy and minimal shift occurs. So Auto WB can do a great job for a lot of scenarios, but there will always be those trickier scenes it struggles with and that's where you need to step in and take control. Autumn shots, Snow, Sunrise/Sunset and indoor artificial lighting to name a few. In this regard its no different than some other automation feature in a camera that needs additional control. For example, I may be in Av mode and the shutter speed that the camera has given me is too high for the lens I have on, it's given me a 1600 ISO value whereby I know can take this shot at a far lower shutter speed (there are no moving people for example), so I toggle out of Auto ISO, control/lower the ISO and watch the shutter speed drop down to a level that is going to allow me to take the shot (without blur) whilst controlling noise better. That's Auto mode for you, it works for a lot of scenarios but sometimes you need to tell it whose boss
In reality there is no 'correct White Balance' in the same way that there is no correct Exposure for a shot, it's down to you the photographer to decide what
you want. I have shot a sunset before and managed to get something on the back of the screen to represent what I am seeing, perhaps a Kelvin of 7500 etc, but you know what? It looked
better when I amped it up to 9000K and changed the tint slightly.
This is one of my earlier test shots with deliberately messing around with WB for a shot (in conjunction with using gels on the flash to try and combat the extreme WB shifts in an attempt to keeping semi natural skin tones);
This was a sunset at a popular spot near where I live, WB was 10,000k in camera for this shot (and blue gels on flash to help combat what would have been yellowly/orangey sickly skin tones on the subjects).
This was taken the same time, this time a WB of 3200K and warmer gel used on the flash;
If you look on the right side of my wifes face (her left cheek and forehead) you can see where the flash didn't reach and that part of the shadow is very blue and shady, proof that the warm gels were helping somewhat but my lighting angles were wrong and there is still too much magenta tint in the skin tones. But it's crazy to see how much you can change the look of the same place through WB. Neither one is correct. The blue tones in the latter image can work really well for industrial settings, the warmer tones of the former for places like beaches etc.
So basically I use AutoWB a lot, toggle out of it when I have chimped an image and can see something is not quite right. Or I just continue on and fix in post.
You might find this video helpful;
Not for one minute thinking you need to buy this (I don't even own one and I shoot professional events
), but you will notice that there are several shades of grey to choose from, white to black in fact, there is also another patch of squares for warming and cooling, again more quick and easy
fine tuning. You can do all of this without a colour checker in post production (that's what the sliders are for), but it might take longer, so this can be a useful tool for many photographers, not just studio work (though with product photography it is really important to get accurate colours, you don't want to be selling a certain shade of lipstick and the advert colour is indifferent to the real thing etc).
I have seen landscape shooters throw one of these in the shot before they work, something that just helps them get to a starting point of WB that they can feel they can work with, but ultimately there is no right or wrong, just good starting points (like a grey lenscap or WB off grey clouds etc).
What you have to really get your head around is there is no way you can ignore WB, it's part of the camera. The Exposure triangle are the parameters you need to control for exposure, but they have nothing to do with
Colour. A picture/photo is a combination of Exposure (shadow & light) + Colour (or lack-of if you go monochrome), the two are necessary and WB is the fourth variable you must deal with as a photographer. There just seems to be a bit of a mental snap in a lot of folks with cameras thinking the Exposure Triangle was all they had to worry about, if only! People can think they are controlling their camera by shooting in Manual mode with WB in Auto, that's controlling 75% of the camera, you're still leaving a variable in Auto mode, and you wouldn't get cross with Av mode for doing its automated thing, so yeah...
In terms of overall image, when you consider a photo is a combination of Exposure + Colour (or mono) then really its like leaving 50% of the final image to the camera to try and do its best for you, it just simply gets it wrong, dslrs are just not that good (you may however find WB is better with computational photography that exists in smartphones, that can better tell what you are aiming at and shooting and automatically flip a WB that is going to be more pleasing for the scene (such as sunset etc). This is where I feel dslrs need to catch up, so that certain modes like Auto WB are just better fine tuned.
Hope this helps.