I've used the DMK, Mike and found I had to grind the shoulder on my 1.25 adapter off to get the camera close enough to achieve focus. From memory the only way I could do it otherwise (and i can't remember if i tried this with the canon) was to use a barlow.
Using the canon (and you may need a modded one with increased Ha sensitivity) you are only getting to use 1 in 4 pixels, though there may be some bleed across wells.
go here
http://astro-nut.com and download the Solar Primer PDF. You will find all you need in there including processing and false colour images