SKYWATCHER QUATTRO 200 f/4

Requires some tweaking, but

Very happy with the quality of my images with the matched aplanar corrector from SkyWatcher. The tube happily sits on my belt modded HEQ5. But there are a few rough edges you'll want to smooth out if you want to use it for imaging: The matched corrector has a working distance of 53.66mm, so some additional spacer purchases may be required depending on what you have available if you go with this corrector. If you are imaging from a suburban location with bright light sources around, a lot of that light will bleed into the tube behind the primary mirror causing artefacts in your subframes. I've blocked it off with a black beanie, and that seems to work well enough. The manufacturing tolerances on the focuser are not great. There's a flat spot on the draw tube where the focuser is supposed to interface with it and apply pressure, but its has a slight concave shape on the one I received. It will only grip on the edges of this flat spot without modification (sanding it down, or an upgrade). As a result it just barely held all of my imaging equipment without slippage before modification. Finally the collimation springs are quite weak. I found that sturdier springs make it hold collimation much better. Overall quite happy with the purchase.