I like CC Passport, but there's one small problem with this product - it's somehow problematic to use for, let's say, wedding photojournalism.
I imagined myself, that a kind of diffuser with transparent target on it and maybe a close-up lens combination could be simplier to use in such situation, but before I'll start to experiment with sticking staind-glass effect foils and old IT8 targets on WB caps I'd like to ask: do you think there's a chance that something like that would work, or maybe there's some kind of a catch I didn't think of, and it's not feasible to make it work?
I've used a host of such products for years.. and most recently have been using my standard CC with their free software to get an idea how the CC passport would work.. and ended up ordering one with my recent NEC puck purchase mostly out of curiosity.
I've noticed two main things with these devices.
1. You need to train your assistant to get them into the scene every time the light shifts/changes for you.. its far too much hassle to have to think about it yourself for event shooting.
2. These devices never get things 'perfect', and perfect usually isn't what I want anyway. What I really want is to get that elusive hue/tint value close enough to easily work with which allows me to adjust the temp to taste.
Its seem to me.. that most of the time AWB with an experienced eye tweaking the WB in post is the most practical and fast solution and acceptable for most.. but sometimes light is difficult and its nice to have these to lean on and use as 'a tool' but not the ultimate tool. Its just one more way to get the job done.
Mixed light becomes the most difficult.. and the most difficult to train the assistant to see and then to choose where to put the CC in relation to the light. We do this enough with slow paced shoots to so the assistant gains experience so the faster paced events like weddings become possible.
I encourage you to try to make something better.. we all want something better. It might push one of my current devices into the depths of the photo equipment graveyard located in the rough looking cardboard box last seen in the storage room behind the old ironing board and in front of the new NEC monitor shipping boxes..