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RobC, you can use OIII and Ha filters with an OSC camera. But... to get full colour you need to take more than one shot since each filter will produce monochrome results. So it's no longer "OSC".
Narrow band with an unmodified, uncooled DSLR also works poorly. The exposure times are much longer, so the noise can be a problem. Forget it in summer. I've seen excellent NB results with modified, cooled DSLR's however.
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