Is there a way to export photos from iPad onto an SD card

There are a bunch of wifi/usb flash drive. You need to try one of them. Please verify that they have the ability to write photo's. I have not tired them.

Kingston Digital MobileLite Wireless Flash Reader for Smartphones and Tablets (MLW221)
Kingston Digital MobileLite Wireless Flash Reader for Smartphones and Tablets (MLW221)

SanDisk
"SanDisk Connect Wireless Stick is the flash drive reinvented to work with both your computer and your mobile devices."
https://www.sandisk.com/home/mobile-device-storage/connect-wireless-stick

iXpand
"Simply plug in the Lightning connector and you can easily move photos, videos and other files off your device and onto the drive. From there, you can transfer the files onto a Mac computer or PC or store them on the drive."
https://www.sandisk.com/home/mobile-device-storage/ixpand

see also:

Amazon.com: USB Flash Drives for iPhone 32GB Pen-Drive Memory Storage, G-TING Jump Drive Lightning Memory Stick External…

R

This device claims as such. I have not used said device.

Allows you to access your own sd card and usb device

http://www.amazon.com/Dane-Elec-Media-Streamer-Mobile-Junkie/dp/B00IA8LLUW

suggested by seeblue

http://www.dpreview.com/forums/thread/3516024

I have only seen mention of importing photos, not exporting photos.

e.g., iPad Camera Connection Kit - http://store.apple.com/us/product/MC531ZM/A