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If you intend to go down the monochrome route in the future, its best to hold off on a filter wheel until you do that.. Certain cameras are better suited to certain filterwheels etc.. So if you were to buy the Orion wheel now, you might have to change it in the future anyway... Likewise if you went for a manual filter wheel now, you would get over that very quickly I think.. Although it doesnt sound like much to stand up, change filters then commence imaging, after you've done it a few times it will grind your gears!
Think first about what CCD you intend to buy, then choose a CFW that will suit...
3cm added between the DSLR and the flattener will make a massive difference to the overall image quality... I wouldnt do that If it were me... I'd consider selling the 2" OIII filter in favour of one of the Astronomik EOS clip in filters that inserts into the front of the camera body. This way you are not changing your spacing at all, and you can just release the T-mount from the dslr, insert the filter, and reconnect the T-mount and your camera should be in the same orientation on the scope as it was before... That would be the cleanest and easiest solution for the time being I think.,
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