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R6 Issues with autofocus with long lenses

TaraLerch
New Contributor

Recently upgraded to R6 and works great with my Canon 70-200 and Tamron 18-400 lenses.  However, I recently purchased the Canon RF 800mm and I am having a heck of time with the autofocus.  It works sometimes but other times it freezes.  It appears to be focusing and then gets completely out of focus and gets stuck there and will not focus - not matter how long I keep the back button focus button pressed.  I have to turn the camera off and back on again and sometimes that doesn't even work.  I also rented the Tamron 150-600 and I have the same issue with that lens - not as often but it still occurs frequently.  With the zoom len, I can zoom out and focus and then zoom back in again to resolve but that takes time and shots are missed in the meantime.  I thought perhaps it was some settings I made but I recently reset all setting to default settings and I am still experiencing this issue.  I have completed the latest R6 firmware update and this did not help.  Do others experience this?  I've posted in another group and had at least one person with this camera lens combo that does not have the issue.  I'm stumped - perhaps I have a defective R6?

13 REPLIES 13

tuyeda
New Contributor

I have the RF600 (not the RF800) but I had a similar issue with the autofocus when I first got it. There is a switch on the lens where you can select "FULL" or "12m-infinity". I had read that "12m-Infinity" would allow it to focus faster because it limits it to a smaller range of focus...

 

However, I found the opposite to be true. After I switched it to FULL, the autofocus worked much faster. I no longer experienced where "It appears to be focusing and then gets completely out of focus and gets stuck there and will not focus." I have since read 1 other post that recommends using the "FULL" option.

 

The other workaround I did was to focus on something midway (if I was going from something close to something far) and then focus on the object. This helps it along. I used to do this a lot  more often (prior to changing it to FULL).  


@tuyeda wrote:

I have the RF600 (not the RF800) but I had a similar issue with the autofocus when I first got it. There is a switch on the lens where you can select "FULL" or "12m-infinity". I had read that "12m-Infinity" would allow it to focus faster because it limits it to a smaller range of focus...

 

However, I found the opposite to be true. After I switched it to FULL, the autofocus worked much faster. I no longer experienced where "It appears to be focusing and then gets completely out of focus and gets stuck there and will not focus." I have since read 1 other post that recommends using the "FULL" option.

 

The other workaround I did was to focus on something midway (if I was going from something close to something far) and then focus on the object. This helps it along. I used to do this a lot  more often (prior to changing it to FULL).  


The experience you quote frequently occurs becasue the lens is set closer than the shortened range. IOW, if you had the lens set at 10 feet and told the camera to only focus greater than 12 feet there is an initial confustion in the AF system.

John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, MX472, LR Classic

tuyeda
New Contributor
Hi John. I don't know about the OP but for me, i saw the auto issues at various distances, but mostly in the middle distance (going from around 30-200 feet). For me the issues mostly went away after switching the lens to the FULL position. I know it sounds backwards but that was my fix so just passing it along to those with issues to try. Maybe it helps. Maybe not...


@tuyeda wrote:
Hi John. I don't know about the OP but for me, i saw the auto issues at various distances, but mostly in the middle distance (going from around 30-200 feet). For me the issues mostly went away after switching the lens to the FULL position. I know it sounds backwards but that was my fix so just passing it along to those with issues to try. Maybe it helps. Maybe not...

Thanks for passing this on. It may help others.

John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, MX472, LR Classic