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Today I used my new grey card for exposure and white balance and I can assure you it is amazing.
For landscape or cityscapes etc maybe it won't make a difference however for portraits, I think it is the most value for money in my investments: the colors and exposure are highly accurate, it saves a lot of time during post processing with very reliable results.
Very happy I brought it
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... and the good thing is ... if you don't change lighting from shot to shot,
it is good enough to have just one or two shots that include the greycard.
Even a selfmade one is much better than nothing ... I use one half grey
half white and take one shot with an exposure that doesnt blow highlights
in the white part ... eventually a "professional" card would be better ...
but if, it wouldn't be by much.
Hust my 2cts ... Rainer
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A grey card isn't expensive, for the price it's not worth trying DIY IMHO.
When you pay $$$$ for a lens because it has good colors, it is a pity to have bad colors because white balance is off
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The colors of a great lens don't become bad, if you don't use a grey card. And "white balance" is not a scientific must for good pictures. Adjusting the colors can be time consuming and especially when white balance is really far off, it gets confusing, because if the colors are far enough off, it can becoe a very different picture and also a possible result but interfering with the original impression I had when pushing the release button.