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Seiichiro Kiyota wrote: > I am also interested in IR photometry since I heard Dr. Henden's talk > about SSP-4 in AAVSO meeting last year. > But I am most interested in faded novae those are visible in IR but not > visible in visual wavelength. > So, I want an 2D IR imager. > I also know that 2D IR imager is hard to build and use for amateur. > Single-channel NIR systems are simple and relatively inexpensive. When you start talking about a 2-D imager, you have to address each pixel somehow, whether direct access or by moving the charge to some collection point. These addressing methods require semiconductor logic, only available on silicon. This then implies a hybrid device, usually a sandwich of NIR detecting material mated to something resembling a regular CCD. This sandwich is where the price gets high since it is far more complex than just photoetching on silicon. There are a few 2-D cameras available commercially, but in the several USD$10K range. I think amateurs will have to be happy with single-channel systems for a while, and there is plenty for them to do with such systems. Arne
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