I'm useless at inventing stuff, and wondered if anyone has come up with above? I realise that making it retractable would be well-nigh impossible. But something fairly snug, to give a little shade and also to provide a little extra protection to the objective, would be nice. Of course the tethered objective lens cap would have to come off. I thought maybe something could be wrapped around the barrel and held in place with camo-tape. (Where is KorHaan when you need him? He was good at this kind of thing...remember his cable-tie sighting device illustrations?)
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