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The l-extreme is very useful when imaging Ha or Oiii rich targets and very effective countering the effects of full moonshine and city light glow. I’ve used it extensively with my scts at both native focal lengths and reduced to f7, f6.3 and f1.9 with the Hyperstar.
With regards to using l-extreme with the Hyperstar, I’ve never done the calcs but am persuaded by others that there is a substantial loss in effective aperture. However, that doesn’t mean it’s not still effective and it can still deliver good contrast with severe light pollution. Just need to be aware of the trade offs. I’ve recently purchased a dual band IDAS NBZ filter which is pre shifted for use with Hyperstar. Just haven’t had a good night to trial it yet.
In addition I like using the Optolong UHC filter to reduce light pollution and this fairly versatile for a variety of targets.
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