You will need an intermediate location to host the SD card and card reader or flash stick. That could be a computer or another device that plays better with SD cards than iOS does. You can upload them to Dropbox or other cloud services and then download them to the SD card. Or one-by-one email them to yourself and download to an SD card from there.
You should consider using Dropbox or Amazon (if you are a prime member) to host all your iphone photos direct from your phone. The storage for photos I believe doesn't count against your other use of storage space in the cloud. In addition, other third-party apps like Documents will upload your camera roll to Dropbox or other cloud services.
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