Why not a 3x or 4x extender for the same result for, say $800, instead of an $8000 premium?You don't have other options to get to 2400mm or 1600mm. These are very niche lenses that most will rend for that one special occasion they know they'll be used. This to me looks very much like they aren't expecting to shift a lot of them so it is special tooling. By using the 400 and 600 as base lenses it has likely drastically reduced the cost while also making sure of parts availability.
I’m a Questar telescope restorer and collector. When we want to get more power from a $2000 or $20,000 telescope we spend $200 for a shorter focal length eyepiece. Which works for visual and covers a full 35mm frame.
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