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Using Circular Polarizing Filters for Digital Infrared Photography
Wayne J. Cosshall wrote:
Ah, so you are a professional photographer. You should have said. I almost went into astrophysics but went into computer science instead. Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog http://www.digitalimagemakerworld.com/ Publisher, Experimental Digital Photography http://www.experimentaldigitalphotography.com Personal art site http://www.cosshall.com/ I actually did partly work my way through college as a professional photographer in an observatory, but with film and and a large darkroom. I'll take digital any day. We closed all the darkrooms in our observatory many years ago. I don't do much, if any, direct imaging, but primarily spectroscopy, which is of course taking images of spectra. We have our own CCD fabrication lab and are now working on a 4K x 4K device with 15 micron pixels- it's big. We have made mosaics of 8 2K x 4K devices that work very well (64 mp!), but each CCD cost around $100K. Even the CCD controllers we build can cost upwards of $100K, but that's part of the price of getting below 2 electrons read noise with a fast read out. I say all this as background to how impressed I am by what you can buy for a few hundred dollars. The technology in even an inexpensive P&S still amazes me, maybe because I know how hard to do this stuff can be. There's nothing like mass production to bring the cost down. Our problem is that almost everything we build is a one-off. There are probably less than 100 CCDs in the entire world, maybe less than 10, that we would consider suitable for a recent instrument we delivered. Joe |
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