Fo­cus­ing with ex­treme NDS

Digital SLR Photography - - The Photo Workshop -

When us­ing ex­treme NDS with a den­sity of more than four stops, be aware that the fil­ter will likely cause prob­lems with aut­o­fo­cus. With the fil­ter be­ing so dark – al­most opaque – AF can’t op­er­ate cor­rectly or lock fo­cus. There­fore, al­ways fo­cus be­fore you at­tach the fil­ter and – once you’ve achieved fo­cus – switch to man­ual fo­cus­ing to en­sure the cam­era doesn’t at­tempt to ad­just or re­fo­cus once the fil­ter is at­tached.

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