"
Peter I would put my Istar 127mm f8 achro up against your TV85 on Saturn any day , the Istar would win in every way .
that's my opinion ."
This is an example of the problem - I am not speculating/espousing my opinions of what might be but empirically reporting my direct observations of a TV-85 versus the other specified refractors. The Vixen 102M is an absolutely superb f/10 planet killer with 100% Japanese glass - but the TV-85 still beat it providing a superior crisp, clearly resolved image of Saturn.
As far as planetary observing at
high magnification is concerned I am doubtful any achro under f/12 will rival a top shelf APO - but rather than affirm a view I will accept the challenge and next time I am in Darwin we can see for ourselves.
