Twin slots

Some Nikon D-SLRs have two card slots… but why?

NPhoto - - Over To You… -

It gives you wider com­pat­i­bil­ity with an ex­ist­ing collection of mem­ory cards. For ex­am­ple, the D800 takes both CF and SD cards.

The Nikon D4s is a spe­cial case, be­cause one slot takes con­ven­tional CF cards while the sec­ond uses the new, su­per-fast XQD for­mat.

Some cam­eras, like the Nikon D610, have two iden­ti­cal SD card slots. The sec­ond card can act as ex­tra stor­age (over­flow) when the first is full.

The sec­ond card can also be used to keep a backup of your im­ages as you shoot – if one card fails, your im­ages are on the sec­ond.

And if you shoot RAW+JPEG files si­mul­ta­ne­ously, you can save each file type to a dif­fer­ent card.

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