I'd use the custom white balance setting. Grab a white balance gray card, or just a white piece of printer paper, have the someone hold it once the lighting is more or less setup, and use that to set the white balance. Simple, easy. Plus the editor can use that image to set the white balance separately or tweak it in post if they prefer. Once you have the WB set to a static value, it's simple for the editor to get white balance to the setting desired in the first image, and then paste those settings to everything else quickly and easily.
90mm TS for studio work? Interesting, I've never show with a TS, but that seems like an interesting choice.
I don't know your specific needs, but with the 24-70, I'd rent one of the 70-200L or the 135L lenses to complement if you are doing more portraiture type shots.
Thanks for the feedback.
You would not happen to have a step by step using either a grey card or white piece paper? I'm not familiar with setting the WB that way...
For the 90mm TS lens, I'm shooting products (high end dinner plates and silverware). They want the image to be sharp only in certain areas (focal plane).
Ah, product photography, ok. Makes sense then.
For White Balance, you're going to want to have someone hold the paper where model you will be shooting will be, then fill it pretty much completely in the frame (but make sure you won't shadow it), and then take a shot. Then you'll need to go to the Menu, and choose Custom White Balance. You'll have to select an image, choose it, and then once it tells you the white balance has been set, you set your White Balance setting to Custom White Balance. See this YouTube video which does a pretty decent job of showing you what you need to do.
|How to set you White Balance (Canon 5D)||Small | Large|