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Old 19-04-2011, 05:05 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
You don't need the filter replaced for focus, but yes the additional UV and IR wavelengths can give bloating in astro shots.
The clip in UV-IR is a good solution for NON EF-S lenses.....(or just have a UV-IR in the optical train before the camera if mounted on a telescope)
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