well stef, I don’t know about ‘minor’ usefulness, seeing how histograms show you how evenly balanced your whites and blacks are.. I’d say it’s pretty useful.. if your first shot is spot on without needing to adjust.. I congratulate you. you epitomize awesomeness.. Personally I aim my first shot through a white balance filter set custom WB.. then take a control exposure with -0- ev then adjust my shutter or aperture to balance out the histogram as relatively good as possible .. but some people can just take perfect shots… …. Again, how much do you charge for lessons? $50 you say?