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I think you'd get away with F/5.. F/3.3 would be out of the question. F/5 may show a little distortion, but I suppose, its a case of cross that bridge when you come to it.. Or, take a few shots with a DSLR at F/5, the ST10 is approximately half the real estate of a Canon 20/30/40D.. So if majority of the field is ok on a DSLR sensor, you should be right as rain with the ST10..
You will not be disappointed with the ST10XME, Mine was the earlier XEi version, without the microlens on the sensor. This model had 30% less QE than the current XME model, and despite that, I've posted up a couple of shots, M16 and M8 that are 60x1minute exposures through a 13nm Ha filter...
I too loved the ST10 for its ability to shoot narrowband, as I image from fairly heavy light pollution most of the time... Which is also most of the reason I'm keen to get another one.. I'm still tossing up between the ST10XME or an STX8300 when they are released.. for pretty pics, the STX8300 is the better option, however no matter how much more real estate it has over the ST10XME, the super high QE of the ST10 keep drawing me back.. I could essentially get equal data with a similar field of view in the same time by doing a 2 panel mosaic with the ST10...
Cheers mate...
Alex.
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