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we can't give ideal magnifications if you don't know the apeture of the scope. e.g. If I told you to use 400x on the planets under excellent seeing, but your scope is only 4", the magnification would be too high, and the image distorted. I can give you generalized bands, but nothing specific.
OC's - Low magnification (60x and below)
GC's - Medium to high (100x - 250x)
Planets - low to high (depending on seeing)
PN's - Medium to high (100x - 200x)
Nebulae - low (60x and below)
Galaxies - low to high (depending on the galaxy e.g. M104 handles 250x well in my 12", but i can only view M83 at 60x - 100x due to surface brightness)
Key: Low = 60x and below Medium = 60x - 150x High = 150x +
Remeber that this is only a general idea and the magnification bands may not be suitable for your scope due to aperture restrictions.
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