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Interesting. The 450D is somewhat limited in it's scope for modification of performance. Cool box experiments prove the sensor is not cooled easily. My LP limits exposure times considerably. Possibly a UHC filter might help but I'd need 2" filters.
I can also drop the ISO to 800 or 400, it's an older camera so that might help sensor noise.
I may switch to the ZWO 120 which I can get down to sub zero numbers and is also Ha sensitive. And I have a 1.25" Astronomik CLS that could be tried.
Thanks < goes away to ponder and check the piggy bank for filter money >
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