I bought a small Vixen wedge that allows me to attach my camera directly to my Ioptron mini-tower 2 mount. This means the camera can “track” stars allowing much longer exposures than could be achieved with a tripod.
I tried this out last night with a Canon 5D mark II and a 70-200mm f4 IS L lens – it worked reasonably well. I had to be careful about focusing but the biggest problem was a circular orange artefact in the middle of every image. I didnt bother to put the lens hood on and maybe the problem was related to this (I researched this – it’s just vignetting – camera lenses aren’t really designed for low light long exposures. Also I had the lens wide open at f4 whereas it’s recommended it should be shut down by even 1 stop for sharpness and to avoid vignetting).
I tried to stack a few images in Registax 6 but it seemed to struggle with the 5000 x 3000 pixel files – perhaps using smaller jpegs might be better.
The image below is just a small part of the much larger widefield images that were taken. There is just a hint of nebulosity seen around the lower two stars in the cluster. Happy for a first effort but a long way to go.