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You want your focal length to be in the range of 6-8m. So you take your current focal length of 1m and multiply it by at least 6 to get in the optimum range. The catch is they only make 5x barlows that I know of.
It's a lot easier with scopes that have FL's closer to 2M where you only have to add a 2 or 3x powermate to get onto the zone.
Of course, then you get into the issues with the brightness falling off and the frame rate increasing along with blur but f the conditions warrant it, you may get some better shots.
since you're already using the 290MM, you won't get pixels that are much tighter than that so changing cameras won't help.
Cheers, Markus
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