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Hi Loopy,
Yes, you could do this. The only problem, is that because of the Ha filter, you would have to expose much much longer, and the pixel noise would get too great. With DSLR's I find the maximum exposure is about 5mins at ISO800. Although it is very much determined by ambient temperature.
It's probably worth a try on something bright like M42 though!
Maybe I'll try next time. We have had so much cloud lately that I haven't been out in ages!
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