hey manav, as i have the same scope as you and pretty much the same camera i can let you in on what my experiences are. That is anything over 3 minutes died in the A55 admittedly i wasn't using a LP filter.
I would seriously consider Narrowband filters as then your not worrying about the LP. but in which case you need to have your camera modded or a CCD cam.
Hows the MPCC adapter going anyhow did it work the way we intended it?
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