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John,
I have only had the continuum filter a short time, so am still experimenting with it. But so far, I can say
1. For visual, it improves contrast, and makes it easier to see the light regions around sunspots. Definitely worth it for visual.
2. For the DSLR, it requires a longer exposure, therefore it can actually make things WORSE if the seeing is poor. I only used it this time because at f/5, I was overexposed at 1/2500 and ISO 400!
3. For the DMK21, the exposure time is so fast either way, I'm not sure whether it really improves things or not. It seems to (and it should in theory), but I'm still experimenting with this.
-Ivan
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