[APML] Newton-cassegrains: opinions sought

[Emmanuele Sordini <vega@bloomingstars.com>]

Hi all,
searching for a more advanced light bucket than a vanilla SCT, I thought 
about going for a top-quality Newton-Cassegrain (~f/4 - f/15), such as the 
Tak CN-212 or others. That would make two instruments for the cost of a 
single one. My fields of activity are:

1) deep-sky film photography (otherwise, I wouldn't be posting on APML 
:-)), and
2) high-resolution planetary imaging with webcams.

Anybody have experience with such instruments, especially as compared to 
equally-sized SCTs? I feel that they might be better overall, but with some 
drawbacks (less compact, more sensitive to local turbulence, and a hassle 
to collimate, especially when switching configuration). Furthermore, they 
don't seem to be very popular among amateur astronomers.

Any opinion/advice will be highly valued.

Thanks in advance and clear skies,
Emmanuele Sordini

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