This is a scheduled post, as I am in Swaziland and South Africa until 7th March, and will probably have no internet access. If you do comment, please don’t think I am ignoring you by not replying!
My Nikon D7100 is the first camera I have owned which has dual memory card slots, and I will now only consider a primary camera if it has this feature, which I now consider an important part of my backup strategy.
The reason I am so enthusiastic about dual slots are because of the options available in terms of backup and file handling.
Quite simply, when Card 1 is full images will be written to Card 2. This is the same as shooting with a single card as there is no inbuilt backup, but if a camera is being left for a long time to do time-lapse, then the possibility of having 2 of the largest SDHC cards currently produced installed to give a 1TB capacity may well appeal to some.
More interesting, and providing some backup immediately after shooting, is to set slot 1 to NEF (raw files) and slot 2 to JPEG. By shooting RAW+JPEG on the camera, you instantly have a backup, and by setting the format to JPEG Large & Fine, the JPEG produced is of good enough quality for 95% of people.
I know wedding photographers will often do this, changing the RAW card as it fills, and leave the JPEG card in place until after the shoot. Instant backup, and a pile of JPEGs ready for immediate sending out (assuming colour, contrast etc. is OK)
Every single file written to the card in slot 1 is simultaneously written to the card in slot 2, so you have an instant backup in whatever file format you are using. It may be overkill for those not getting paid for their images, but I would hate to have an amazing shot in the bag and see a card error, knowing it is the only copy of my image.
In short, dual slots give me more options when it comes to backup and workflow, often meaning I can travel without a laptop or tablet.
In future, I would struggle to consider a camera for use as my primary camera without this feature.
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