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Hi SuperG,
I am also a DSLR imager in Bortle 8 Melbourne skies. I tried CLS filters initially to deal with LP and they probably doubled my possible exposure time ( all other settings being equal ). With the UHC or the CLS style broadband filters there are always colour cast issues to deal with. Not that this is a big issue but it is something you will need to address in post processing. Then we move on to the UHC-E ( or similar). Better imaging filters for sure but they do require significantly longer exposures to achieve the same amount of luminance. They handle stars much better preventing bloating as much, generally giving a shaper image. Bare in mind though that longer exposure times require more accurate tracking/guiding. Finally we get to the Duos. I use the STC Duo although I know others that use the L-Enhance. These are genuine dual band narrow band filters. Because of their tight band widths they are absolute game changers but it comes at a price ( not just the hefty financial one ) . The required sub lengths are looooong. To be honest I think far too long for an 80mm refractor with a DSLR. This does depend on how good your camera is but upwards of 5 min exposures, you’re likely to get lots of artifacts in the image. DSLRs don’t tend to like exposing for that long. If you can’t take super long subs then the alternative is to take hundreds of subs. Of corse you could end up doing what I ended up doing and just doubling the size of your scope...... more money......
I hope this insight helps. My advice in short is grab the UHC-E and give it a go. If it’s not giving you what you want, they tend to sell pretty quickly in the classifieds.
Cheers
Ryan
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