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 p.1 #2 · EOS-R with 400mm f4DOII. Compromised IS functionality? | |
ChrisMak wrote:
I recently got an EOS-R for use with the 400DOII+2.0ex.
Right out of the box, and after installing the latest frirmware 1.6, I noticed a jerking or jumping viewfinder behavior with IS mode 1 that I use by default. On the EOS-R, IS is active all the time, instead of only when half-pressing the shutter, which is the case with Canon dslr's.
When I look through the viewfinder, it is simply close to impossible to position the small AF square over a subject and keep it there, because the af square makes small jumps up/down, or to the left at intervals of around 1-2 sec.
It does this repeatedly, and sometimes there are more prounced, larger jolts to the left, which are audible in the lens IS unit in a silent environment.
I suspected a defective lens IS unit, which would be strange, as I bought the lens new 8 months ago, but when mounting the lens on either the 7DII, or the Sony A7RII (+mc-11), this strange behavior is totally gone, and the viewfinder image is stable and constant, also when keeping IS active constantly by half pressing the shutter button. I simply cannot reproduce it on either of these bodies in any way.
Putting the lens back on the EOS-R, and there are the jumps again.
A strange further complication is as follows: turning off the EOS-R, switching the lens IS unit from mode 1 to mode 3, turning back on the EOS-R, and then switching the lens IS unit from mode 3 to mode 1, and the IS works flawlessly as long as the camera is powered on. Power off the camera with the lens IS set to mode 1, and turning it back on, and the jumping viewfinder is back.
Is this one of these "give you a big headache" things? Or does anyone have a possible explanation for this strange behavior? And is there a possible solution in factory reset or firmware re-installment? I did a full erase of user settings, and it was temprarily gone, but re-appeared after a few times turning the camera off and on.
Canon's response was: buy a RF lens! We cannot guarantee operation of EF lenses via adapter. Right.... but that is not what their USA website states:
Compatible with EF/EF-S Lenses*
Whether you're purchasing your first EOS camera or your fifth, the EOS R camera is designed to integrate smoothly into existing EOS systems. Engineered to work seamlessly with RF lenses, it maintains complete compatibility with EF and EF-S lenses by using one of three optional Mount Adapters. When using EF-S lenses, the EOS R even crops automatically to reflect the APS-C sized sensor the lenses are designed for.
* Optional Mount Adapter EF-EOS R is required when using EF/EF-S lenses with an EOS R camera.
...Show more →
Ask them where to buy the RF 400DO or else demand a prototype if that is the only help they can offer. Geez...what a stupid response from them 
Sorry I can't help with your problem. Message RobAmy to see if he has noticed anything similar with his R and 400DOII.
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