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I know that with the 10" f4 Newt that I went for has a 2" focuser as
anything else was going to be ridiculously pricey.
Large field flatteners, filters and the focuser with OAG equipment
and with focus drive motor, larger camera -
will all be extremely costly -
much more than the telescope itself.
OK - a 2" focuser will not allow for 100% illumination
of the entire field but
it will still image well at the center of the target.
Even if you did upgrade to a larger focuser then
you'd still be thinking about adaptive optics -
( if you had a telescope with the back focus to allow for it. )
Then you'd get fed up with setting it up every time
you wanted to use it
and need and observatory dome & pier.
Astronomy seems like a bottomless pit to throw money at.
Everyone needs to draw a line somewhere when they set their budget.
cheers
Allan
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