Please, support PV!
It allows to keep PV going, with more focus towards AI, but keeping be one of the few truly independent places.
It allows to keep PV going, with more focus towards AI, but keeping be one of the few truly independent places.
Reference level white card
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Among everything you can use for white balance card PTFE is usually best. Just make sure that it is not too shiny to reflect light spots.
Reason for this is
In visible range it has exceptional uniformity, so it reflect exactly only light source spectrum, contrary to most white paper that can play trick due to UV agents added to boos perceived whiteness. Here is sample of paper (they are all different, btw):
Do not use too thin PTFE items - use 2mm or more.
Price is around $6 for 100x100 sheet.
sample434.jpg651 x 529 - 37K
sample435.jpg686 x 453 - 37K
sample436.jpg606 x 417 - 35K -
Interesting info.
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Thanks! Nice find!
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