Is this gray card set reliable?

Because they will be too small in the frame.

They need to cover the entire frame and they also need to be in the set where the light is.

That means you will need to move the camera right up to them and that will be impractical and time consuming in most instances
 
Oh, yeah, I completely see what you're saying.

We will be using larger ones, but I'd like to have small ones like those, which I could carry around my neck on the lanyard; it just seems rather convenient.

I was just curious if anyone knew if those were reliable gray cards for balancing.
 
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