In this example the DSI IIIc is teamed up with an Astro Engineering .6x focal reducer fitted to the camera nosepiece. I wasn't sure about whether the spacing would be ok for the bigger chip, but had it handy so decided to give it a go.
Stack of 14 exposures totalling 112 Secs. Dark subtracted but no flat processing.
First thing that strikes you is that this much more than a .6 reduction... the field of view is bigger than the meade focal reducer at F3.3. It's got some significant vignetting, but the stars are less distorted than with the meade. Maybe just about usable with some flat processing, but still a surprisingly good result for £25 worth of optics. Going to see if I can get a modified nosepiece made up and try a closer spacing between the FR and the chip.