[spdustin]

There's also a model-specific wedge that can be used to "convert" to Equatorial. My SCT has one available, though I don't use it, since most of my imaging involves stacking much shorter exposures at lower magnifications than would be problematic with field rotation.

[privong]

Good point. Those are available for amateur telescopes. I should have noted I was referring to professional University or national-level observatories.