Re: ATM A long post ...

["Dan Chaffee" <dchaffee@gvi.net>]

Hi Bratislav,

> The mid to low frequency region is traditionally worse in obstructed
> instruments. That's what makes them somewhat inferior to refractors in
> planetary observations. Broad areas of very low contrast - that is
> where refractor shows the clean pair of heels to say Newtonian of equal
> aperture.

If this subtle, yet unmistakable comparison can be perceived with visual use,
does it also show up in ccd/photographic comparisons? One would think
that being able to visually discern this kind of difference would not be be purely
a subjective response.  Of course, I realize that no imaging device (none that
I'm aware of, anyway) duplicates human vision EXACTLY. So until there is, a
quantification of this phenomenon may have to wait ;-)

Dan