Hello Phil! Thank you for your question. I will be assisting you today.I'm sorry about the issue. You can use either SD or SDHC memory card type for your Panasonic Lumix DMC-FS3 model. For example, you can get the SanDisk 16GB SDHC memory card:http://www.amazon.co.uk/Sandisk-SDSDB-016G-B35-16GB-Class-Memory/dp/B001W1BSM0/
Reference; camera's specifications:
Please let me know if you have any further question. Thank you,
You're welcome. If you need anything else, please let me know any time. Thank you.