Canon R7 R7 with EF-S 18-55mm lens: bad focus

[Profk99]

Hi all,
I bought the R7 two weeks ago and have been shooting with my old EF 70-300 zoom lens and an older EF-S lens that came with my EOS 300D. Both lenses use the Canon adapter to mount to the R7 body.
While the pictures shot with the EF lens are perfectly in focus, the EF-S poses a problem, especially with landscape photos. While the focus through the viewer  appears to be perfect, the resulting pictures are not.
Anyone a suggestion? Thanks
Hans

 

[ACEkin]

I have been dealing with the same issue. Tried to move the focus function from the shutter to the back button, and changed focus patterns, but nothing helped. This morning, I shipped the camera and the lens to Canon for warranty repair along with a thumb drive with sample RAW images.

 

[ACEkin]

Following up on the issue, I kept testing after I received the camera back from Canon. There were several problems I recorded. One, an f-stop smaller than 11 seriously degrades the image quality. Two, there seemed to be a tendency to back-focus. Three, depending on the focal length and f-stop, the back-focus may shift to front-focus. I did these tests using Michael Tapes's Lens Align target.

After the tests, I contacted Canon and after a few e-mail exchanges, they wanted to see the camera-lens kits up close as my wife's identical kit showed the same problems. They were kind enough to provide the FedEx shipping label and I shipped them both back. Today, a little while ago, I heard from the camera specialist who called to discuss the problems before. He said he took some photographs and they looked fine. After carrying on the conversation, he also agreed that using f-stops smaller than 8-11 degraded image quality.

They are shipping back the camera and lens kits back and we will see how it all works out using a lens that has only 2-3 usable f-stops. It is disappointing, but apparently a fact of life. I may decide to change the lenses and see what I can do to get a replacement. Maybe 24-105 RF-S which is a good deal lighter than the L series version of it. I will try to take some test shots before deciding whether to switch or not.

The real disappointment is that I have an 18-150 EF-M lens on my M5 infrared camera and it does not manifest these problems. I should have kept my regular M5 along with the IR version, they yielded better results than I get from the R7 and 18-150 RF-S combo.