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Hey Jeremy,
Could you give a bit more explanation on what the filter is used for - is that a filter for day time shots for a modded camera with most normal lens (not the EF-S series) - or is it for night time use with a modded camera but with a Canon lens to aid it auto-focus?
I am just trying to understand when you use this filter (what combination of gear and shot benefits from its presence).
Many thanks,
Matthew
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