Will this lens work with a Canon 5d mkii? - Quantaray AF 70-300mm f/4.0-5.6 High Speed Auto Focus Zoom for Minolta

Usually a MANUAL sensor cleaning should fix it. (camera NOT in automatic mode/ -above the "P" on the dial.

I’m happy to help further over the phone at https://www.6ya.com/expert/mike_316638c836088218

On the 5D error code 30 appears to be shutter related and general advice is to get a professional repair or send it back to Canon.

Err 01: Lens to body communication error
1.The camera to lens communication is somehow being interfered with could be a problem within the lens itself, possibly the camera body, or something as simple as a smudged fingerprint on the lens mount contacts,
2. Check the lens and the contacts
3. Also check below link if you need a canon eos 5d service manual
http://goo.gl/1rXwuc

thanks

the lens is des connected or not properly attach to your camera if it wont work just go to the canon service center for appropriate check up

Try operate the camera without lens, if the camera works without lens, then you change the lens, camera is fine.

As far as I know, you should use L series Lens to fit Full Frame Canon Camera (5D & 1D).

That would be no adapter, but please correct me if I'm wrong.

Error 99 is a lens issue. Try this.

Try cleaning the contacts on the lens. Use a clean pencil eraser and hold the lens upside down so that the eraser debris falls onto the table and not into the lens. If this doesn't fix the problem then you need to have the lens repaired.

It really depends on what kind of photography you want to do.
I own both of those bodies, and the 5D is great for landscapes, portraits, and other artsy stuff.
However, the 3 frames per second doesnt compare to the 5FPS of the 30D, so if you're shooting sports, the 5D will do better.
Also, 5D is better for wide angle shots.

If you do decide on the 30D, again, lens choice really depends on what kind of shooting you plan on doing.