Hi:

This is important. Pay attention. To my knowledge there are no 16GB mini or micro SDHC cards available. Today I checked:
Transcend
A-Data (no response)
Patriot
SanDisk
Kensington, and
PNY

The largest SDHC card in a mini or micro format that I found was 8gb. Do a Google Shopping search on: 8gb memory card (mini OR micro) Prices vary quite a bit.

You can't use the standard size SDHC cards in an 810.

Good luck!