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I'm quite surprised by the positive responses. The AP155 (thanks for the detective work Greg)...in fact AP scopes in general...have quite extraordinary glass. My 155 simply doesn't need refocusing across an RGB filter set.
Big APO refractors are also very forgiving in urban environments.... great contrast and no secondary obstruction shadows to cope with on top of the inevitable LP gradients.
Again, many thanks for the feedback...
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