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Originally Posted by tornado33
thanks.
Rocket Boy, yes the IR cut filter might stop excess IR light from coming through, however its mainly for refractors, as they focus IR light slightly differently, resulting in bloated star images if no filter is used. That doesnt happen with refector scopes.
Scott
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Thanks Scott for that.
The reason I ask is because I know Houghy's used it on the 80ED and I would have thought that it's not necessary with an "APO" type scope like that.
Because if it is beneficial then I'd like to get one too.
BTW is the IR cut filter the same as a fringe killer filter?
Also what scope were these taken through?
Cheers.