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Brian, The 4SE is not a good choice for deep sky astrophotography, because it is VERY slow photographically, and would need VERY long exposures for
just about all deep sky objects. It is however very good for lunar and planetary imaging, [much brighter objects].
With very long exposures [subs] you would need accurate polar
alignment, and guiding, which is not the 4SE's forte.
For long exposure imaging you really need an equatorial mount which
has hand operated adjusters on both axes, and a "faster"scope,
say between f/4 and f/8.
Sky Align, unless it has recently changed radically, is only accurate
enough to place a given target in the field of view of a low to medium
power eyepiece; it is not intended for imaging. For long exposure work
the mount has to be pointed to within a few arc seconds of the
celestial pole, far beyond the capability of Sky Align.
raymo
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