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Thanks all, Im back from my weekend away.
Its not cropped, its full frame.
I now focus by connecting camera usb cable to laptop and taking short 10 sec images @ISO1600, in large jpeg, using the canon remmote capture app. When the pic comes up on the laptop I zoom right in (way better then looking on back of camera, then move lens focuser 1mm or less one way, then try again, if stars bigger I go 2mm the opposite way, if smaller I move another mm same way until they are as small as possible. What works well is that Baader have optomised their HA filter for faster systems, so it probably performs better in the 300mm F2.8 lens than say, an Astrodon or Custom Scientific filter.
Even on each sub as it was taken it looked brilliant, blood red nebulosity extending out. Its xtra contrasty as there was in fact no moon up at the time, it had only started rising after Id finished.
In a finder the rosette is found by locating the star cluster at its centre. you wont see any nebulosity unless youre at a very dark site or with a nebula filter
Scott
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