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Thanks all
Good question, Gama and its because the narrowband filter doesn let in infra red light lower down in the spectrum, they recommend a uv/ir filter for full cut off, only allowing in the Ha light. My DSLR is modified to allow in all light as I chose the clear glass option on the sensor when I ordered it from Hutech so I can do dinfra red imaging if needed.
Heres a colour version, showing similar to what it looks like on the camera screen
Scott
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