Assume these are with the TS Apo triplet in your signature? I'd say overall impressive for that aperture and the 450d (I'm still amazed at how well this camera does for astro well over a decade from release. And while the syvbony is "cheap" relatively it produces results closer than I can tell apart from more expensive broadband LPS filters I've tried. I used it quite a bit on the 450 and 600d and impressed me enough to buyt the UHC clip in from them as well, but have never tried it since going to dedicated astro cameras.
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