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Post by Deleted on Jan 27, 2015 1:19:58 GMT
Hi,
I still have my copy of my 'Complimentary' Kodak Wratten Filters book, it has data on every Wratten filter made, examples here. In the days of scientific imaging with various plates and films at all wavelengths, this is how I controlled what I wanted to see or not to see. They have the same applications used with optical systems in this digital age too-if you have them. Fortunately I still have a pretty wide selection from my scientific imaging days, which started back in the early 1960's.The book contains extensive data on every filter, with comments on their suitable/suggested applications. It is a valuable insight into how filters work and their uses. Filters come in gelatine squares, 2"x 2" and 75 mm x 75 mm, some are also mounted between optical quality glass. I still have an an extensive range, some of which I still use in photomicroscopy etc.As you can see, the No 12 Yellow will absorb more blue - (Minus Violet) note the dip in the spectrum.
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Post by Dragon Man on Jan 27, 2015 7:25:41 GMT
Nice collection Shevill.
Yes, the book would still be practical with today's imaging and Video.
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