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Old 05-06-2012, 07:38 PM
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Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,193
I can't speak for the 5D III, but on the others, 450D through to the 1100D the front anti-alias/ dust filter acts also as a UV-IR cut filter. Removing it will increase the pass wavelengths into the camera and possibly cause UV or IR bloating in "normal" family photography.
Each filter (the Colour Balance filter - on the CCD, and the Anti-alias filter - at the front) is 1mm thick. So for each filter removed, you change the "body depth" by 0.3mm.
This change makes a minimal impact on the focus of standard lenses when only the Colour balance filter is removed i.e. normal astro mod.
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