JJC Hand-held Professiona White Balance Filter, Universal White Balance Handheld Disc for Digital Photography DSLR, Easy to Use, Consistent Accurate Color, for Lens Filter Diameter up to 95mm

I've used this on two Nikon DSLR's with WB preset function (D90s & D750). I ran several trials of my own comparing the auto white balance with presets using the filter.Here's the key to setting white balance using this method over your camera's auto white balance:Auto white balance looks for the brightest spot in the frame when you take the shot and assumes that to be pure white. It adjusts the color balance to make that spot white. In many photos that will work great, or at least be close enough that the colors look good.For my tests, I made sure that there was nothing white in the shot, which happens more often than you may realize. My trials were both indoors and outside. For each trial, I took two consecutive shots from the exact same position with only natural light using the exact same focal length, shutter speed, aperture, and iso - simply changing from auto white balance to a WB preset using the JJC WB-F1 white balance filter. The results were dramatic, with the preset reproducing the colors accurately while the colors in the auto white balance trials were conspicuously incorrect. In one example the brightest part of the shot was part of a beige wall in the background, and the auto white balance made it a white wall, shifting all the other colors accordingly.I love how quick and easy it is to use - and I put a lanyard on it using the hole in the handle for convenience when I'm shooting outside. I'm a Nikon guy and setting the preset is a simple as 1) change the WB from auto to preset 2) press and hold the WB button until "Pre" flashes on the LCD screen 3) face the light source* and hold the filter over the lens 3) squeeze off a shot - auto focus is inhibited, and it doesn't actually take a photo 4) look for "Good" on the LCD screen and you're ready to go! If the light changes (e.g. clouds or shade), simply redo steps 2-4.* when the predominant light falling on the subject is reflected - say, off a wall, that is the light sourceI understand many Canon DSLR's also have this capability, but it may take a extra step or two. Check with your camera's user guide.My tests were hardly scientific, but no reason for me to think the ExpoDisc would perform noticeably better, if any better at all. I've never held an ExpoDisc in my hand, so they may very well pass light frequencies slightly more accurately and may even be constructed more durably... I don't honestly know, Even so, I can buy three of these for the price of one ExpoDisc, and I'm very happy with the performance of the JJC filter. If you buy an ExpoDisc specifically for the size of your lens, it sits on the lens so you may not need to hold it when you take the calibration shot, but most ExpoDisc reviews advise you to buy the larger size so that you can use it with all your lenses regardless of filter ring size. That means you're holding it by hand anyway - and they don't have a handle.Even if you shoot RAW like I do, whether with the JJC or a competitor, this method is an easy way to get accurate baseline color balance in the metadata, streamlining your retouching process.I'm very happy with the JJC white balance filter, and would buy it again in a minute!

How to use:(1) Put the white balance disc over your lens.(2) Aim your camera at the light source and take the picture in RAW (shooting RAW is the best for color correction).(3) When using the white balance selector in Lightroom, remember to put the dropper over a white area (or an area that should be white) that is the light coming from the light source. (Or use whatever is the Lightroom equivalent for this in your photo editing software.)When you follow these steps, it works great! Attached above is the before and after. It's proven to be highly accurate when I used the same color temperature and tint settings for other pictures that were taken with this sort of light source.

This is an incredibly easy-to-use gadget to help set a custom white balance. I have used a gray card when shooting portraits, but asking the subject to hold it is awkward and then if you move to another location outdoors, you need to do it all over again. It really slows down the session. Once you've rehearsed the steps using this filter to set the white balance takes less than 1 minute:1) Change focus mode on lens to manual2) Change White Balance mode to Custom on the camera's menu (I can do it 2 different ways via the menu of the top control panel on the Canon 5D)3) Shoot one image with the JJC Filter close to the lens, filling the frame with the filter.4) Select this image as the Custom White Balance image on the WB menu5) Change lens back to Auto Focus and start shooting.I do need to remember to change back to AWB after the shoot or I will end up with a weird color in later images. I do shoot in RAW, so it's easy enough to adjust in ACR, but I'm trying to eliminate that step whenever possible.The JJC WB Filter is sturdy yet lightweight (all plastic) and includes a hole at the end of the handle so that you can thread a string or cord to it to hang it from your camera bag or tripod. The surface appears to be many tiny lenses that bend and refract the light. I don't understand the light theory behind the design, but it definitely seems to work. I have tried it in several lighting conditions, one of which was a mixture of tungsten light bulbs of various colors, and it definitely improved the overall color of the scene.