Eos 7d Canon
Is the Canon EOS 7D compatible with SD / SDHC?

I hope not! How do you think an EOS 7D burstrate can be high, it is necessary files and write the SD cards are the fastest means of communication. Not used CF cards, the basis of trust and the media at high speed. UDMA models can run more than 60Megabyte per second. Yes per second! Although the SD card and now only has one write "speed" class system. Stop .. 6Mbyte per second. Call Class 6 and is very expensive. CF cards are cheaper then that.

Eos 7d Canon

What is the best for wide angle lenses Canon EOS 7D?

I do not know if it's the "best fish-eye, but certainly 7D affordable. Pro-Optic 8mm fisheye, which is sold by Adorama exclusively. http://www.adorama.com/PRO835EOS.html $ 289.95 with free shipping.

Canon EOS 7D Shoot