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How long is a piece of string??
There are many variables to how high you can go.
The general rule of thumb is 50x the aperature in inches.
This does how ever depend on the quality and optical alignment of the scopes as well as the atmospheric conditions and objects sort.
I have a 12.5" f6 low obstruction Newtonian scope of high quality and have obtained higher mags than 50x /inch but this is a rarirty and was only to see what my limits are on nights of good seeing. Usualy 3-450 for me at 12.5"
I have been able to use a friends GSO 12" on occasions and
practically 250-350x , but make sure you have it well collimated before trying high powers or you will be disapointed.
We spent conciderable time collimating his scope to use this sort of power.
Mark
Last edited by mch62; 05-04-2005 at 10:42 AM.
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