This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Long Short Focus . An early calculation of CoC diameter indistinctness by in Circle of confusion Perhitungan awal diameter CoC indistinctness oleh pada tahun en bRITISH JOURNAL OF PHOTOGRAPHY PD PDold Check categories November en Circleofconfusion zh Photography Optics History of photography
Page 2023 Free-images.com. All images are Public Domain