I am not a Pro and just have a love of using my equipment to produce images that please me. If it were not for the fact that I just bought a Canon 24-105 f/4 L, I would probably give the Tokina a shot.

Just so that no one makes the mistake that I made in ordering from somebody who just dumps junk on ebay; pavvih is the name of the seller. The lens needs replacement of the motor base unit, at a cost of $250.00.

Thanks for your good responses and advice. I did contact the seller and he e-mailed me back calling me an a--hole and saying he was a liar. I have to go through Ebay or PayPal because he refused to give a refund. I have bought and sold many times on Ebay and this is the first time I have ever had a situation like this. This may be my last purchase from that site. It's just not worth all that. I will get this resolved.

I have already contacted the seller and Ebay. Thanks

That should have been obvious.

I recently bought a used lens on Ebay; Sigma 70-200mm 2.8 OS, for what I thought was a good price: $750. The seller said that the lens was in great condition and fully functional. The lens arrived and looks brand new. I put it on my 5D to photograph birds in my back yard. It would not auto focus. I put it on my 50D and it would not auto focus. I have two Tamron lenses which I switched between the two boxes and had no problem. I cleaned the contacts on the Sigma lens and both cameras and had no auto focus. I am now in the process of trying to return it. This is disappointing, as I have bought used lenses on Ebay before and have had no problems.

Watching instructional videos on YouTube. Shoveling every 2 hours and waiting for the big game.

Canon 5D classic. Original.

Could someone direct me as to how to set this up?

This is not a question about the use of back button focusing or how it is done. I currently have my 50D set up for it and use it. I also own a 5D and want to know if it is possible to do this on that box as well.

This lens appears to be a mainstay in most of the UHH bags. What are the main or best uses for this glass?

If one only shoots in RAW, does it matter which picture style is selected on a Canon DSLR? Someone told me that his only effects shots taken in Jpeg.

I would narrow my list to include the 70d and the 7dii.

I actually just bought a 5D. I will keep my 50D. I want to see for myself the difference between APS-C and FF. For the price I paid I think it is not too much to pay for the experience.

Wow! Now that's what I call an amazing response to a simple question. This is very useful information that will be a great help in making my choice. Thanks!