Thanks Saturnine: so many designs! I haven’t tried any orthoscopics so far, never thought I had a use case that differentiated them significantly from my plossls, but I’m still a relative novice with a very small collection, and will surely try at some point. I’m a fan of Baader!
Thanks Alex: these TMBs certainly have an interesting back story. I don’t think that the term clones necessarily implies any skull duggery. There are lots of re badged, housed, rebranded Astro stuff. All legitimate, and all clones. The sky watcher Az eq6, Orion Atlas pro, Saxon AZEQ6 I would describe as the same mount or clone.
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Good quality Plossls should not be left out of the mix, with their simple design and less glass for the light to pass through, they provide great views, with 50 / 52 deg FOV. Like the orthos', unfortunately as the focal length gets shorter say from 7mm down, so does the eye relief which makes them difficult if not unusable for old eyes.