11-01-2014 09:58 PM
Yes, it is because it is a 3rd party (no-Canon) lens from the film era that just happens to not be compatible with the newer Canon Digital cameras.
Not all film eras lenses have this problem and sometimes the manufacturer could "re-chip" the lens to make it work properly again.
11-01-2014 10:01 PM - edited 11-01-2014 10:04 PM
well heck, guess i should save $100 and get the 75-300 Canon lens that I was going to get anyway.. thats what happens when you try to go the cheap route huh I only gave $20.00 for this lens and it gets good pics otherwise.. maybe i should throw it on ebay
11-01-2014 10:03 PM
No, your best bet is to leave it in Av mode and at f/4 at 70mm. It will automatically change to f/5.6 as you zoom out to 300mm.
It would also do the same in Manual mode but then you would have to adjust the shutter speed manually to get the right exposure.
If you put it in P or Tv or any other auto mode, the camera will sometimes stop down the lens to something like f/8 if it is bright out and you will get the error again.
11-01-2014 10:16 PM
11-01-2014 10:26 PM - edited 11-01-2014 10:36 PM
The 75-300 is an okay lens but the best Canon telephoto zoom lens for your camera right now is the 55-250mm IS or the 55-250mm IS II or the 55-250mm STM.
These lenses are better because the Image Stabilization really helps keep the image sharp with slow shutter speeds and they also have better optics.
You should be able to get a 55-250mm IS for about $100-$125. ebay 55-250mm IS
Here are a bunch of "buy-it-now" for about $100 plus shipping: ebay 55-250 IS "Buy-It-Now"
11-02-2014 08:47 AM - edited 11-03-2014 09:41 AM
The Canon EF 75-300mm f/4-5.6 III Lens, which is on it's third version, is also a very "cheap" lens. It is not a good canidate to buy used unless you get a return privilege. You may be looking at version 1 or 2 which will be worth less. The build is not the best but at least it should work for you.
11-03-2014 04:39 PM
Over the weekend, I was shooting with my 6D at an airshow. The camera gave me the same error using my 70-200 2.8L lens. It also happened when I was shooting continuous and several times.... Not only that, but it corrupted 2 SD cards Sandisk Extreme PRO 32GB.... I only use the best equipment and want an answer to this from Canon ASAP!!! I had this happen a total of 4 times on Saturday.... It seems to me like a buffer is getting full and overloading the camera which is clearly a software issue.... Looking forward to an answer.....