Canon 5D and 550EX focus assist beam
Hi I am recently using the Canon 5D Mk 1 with 550ex flash. I noticed that the red focus assist beam doesnt work if I use the top or botttom (the ones right above and below the centre point ) focus points. Why is that? I thought that the all the focus points would be covered by the red beam emitted by the flash? Thanks for any explanation!
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