From: Larry Colen
I've got a set of greycards (white, grey, & black) that are a bit
larger than a business card. I frequently use them to get a white
balance reference, since I'm more likely to shoot in weird lighting
than in "standard" light, such as sunlight, or flash. I recently
realized that it would be really handy if the edges of the grey card
were marked in inches and fractions on one side, and cms & mms on the
other. That way, when I take a photo of it next to a flower, or a
bug, to get a white balance reference, I'd also have something to
give a good size reference. The ideal would be to have a grid of
inches or cms, with the fractional markings along the edge.
Speaking of grey cards, I really wish I could get lens caps, in 18%
neutral grey. That way, I'd always have my white balance reference
with me.
Ask and you shall receive:
http://www.northlight-images.co.uk/content_images_2/colorchecker-passport/3-way-open.jpg
The X-rite Color Checker Passport has a scale along one edge & the
squares are all the same size which provides the grid.
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