Does anyone know how much % grey the back lenscap is of an e-mount lens?

Started Dec 4, 2012 | Questions thread
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de7geitjes
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Does anyone know how much % grey the back lenscap is of an e-mount lens?
Dec 4, 2012

In some situations i forget my grey card but i always have an extra emount lens with me with that grey lenscap. So i thought maybe i can use that to correct white balance?

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