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Nice shot there, one can see how the Ha filter supresses the blue but enhances the red of the Triffid.
I take it you focus by taking short test images then checking focus, or using software like DSLR focus?. I found visual focussing is impossible with the Ha filter. Through the 10 inch Sirius is just bright enough to see lol. I take short 10 second shots, and zoom in and check star images on camera display.
Scott
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