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Old 04-04-2008, 11:04 PM
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Gama is offline
Join Date: Dec 2005
Location: Melbourne
Posts: 1,121
Just to add a little and clarify an other.
When mirrors are used, there is no error. All points focus the same.
So if you have a newtonian, then leave it as is, without the glass.

You can also use an external filter to remove any issues, thus saving a little to get it fitted with a IR glass filter.
This is what i do with my 20D

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