Quote:
Originally Posted by rcheshire
Steve. 850nm seems to be OK. I read that humidity is a problem and longer wavelengths do better. I've had my eye on a ~1000nm filter to pair up with a full spectrum Canon but on second thoughts perhaps 850 is adequate.
NIR has been in the pipeline for a while. And possible now that auto-guiding is up and running.
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The limiting factor is the IR response of the CCD and you are correct - you are still getting about 30% for the 6303 at 850nm but at 1000nm that drops to 5% and goes to zero at 1100nm.