One posted Facebook photos that were very hard to judge due to the resolution and high ISO, and the other just gave verbal confirmation. I would need to see high quality photos to make a judgement.
Jesse Evans wrote:
Did they post evidence? I also didn’t think I had the issue until I did the objective test.
This appears as if could be curvature of field. The center of the field is sharp and the outer parts are a. bit less sharp. Classic curvature of field and not an error in focusing. An optical aberration.
The lens is a normal range lens with close focusing abilities. Past history says this will result in sharp centers and less sharp outers at close focusing distances with curvature of field said to be the culprit.
I have an R and a 180 and a 100-400 which focuses quite close. But, alas, I am out photographing giants asleep and a herd of mountain goats scaling a rock wall. So, no, I won't be performing any tests right now. And I am using an R with the 100-400 but not at 1:3 right now. It is not butterfly season in Montana. At the distance I am using it, I am very, very happy with the focusing performance. But then I am focusing on real world subject, not test charts.
It should be a simple enough geometry/trigonometry exercise to calculate how far forward the focus point is at 200mm and MFD on this lens at the edge of the frame due to curvature of the focus plain.
Even if the lens has perfect spherical field curvature, which is nearly impossible to expect from a telephoto, curvature would not explain why manual focusing resolves the issue. Manually focusing brings the focus chart and the 0 line in to perfect focus.
It seems that this site cannot be switched to english....
I was wondering if you have have this firmware available as well.....
I am pretty sure a view people will test this firmware soon and I can tell you if this has resolved frontfocus issues as well.
I read the EF version was tested and is ok on the R, but has anyone tested the EF 100-400 II at MFD on the R? It may be the only EF telephoto zoom that can focus as close as the RF 70-200.
Here are the translated firmware notes from the German site for 1.0.5:
Firmware includes the following improvement:
- Reduces color faintness when taking long-exposure images with the EOS Ra.
* Manual focus can not be activated during the exposure time. When zooming during exposure, the subject may be out of focus.
This firmware update is for lenses with firmware versions older than RF70-200mm F2.8 L IS USM firmware version 1.0.5. If the lens already has the latest firmware version installed, it does not need to be updated.
The firmware version of the lens can be checked in the camera menu.
Preparations for the firmware update:
The folder you downloaded contains the firmware (file name: RF024105.afu, file size: 2,883,636 bytes) and a firmware update guide (a PDF file in five languages: Japanese, English, French, Spanish and Chinese (simplified)). Before you start updating the firmware, you must have read and understood the instructions.
highdesertmesa wrote:
I read the EF version was tested and is ok on the R, but has anyone tested the EF 100-400 II at MFD on the R? It may be the only EF telephoto zoom that can focus as close as the RF 70-200.
Ok, a quick test, tripod-mounted EF 100-400 at very close to MFD, wide open on the R. Looks like it does fine. Excuse the mediocre testing setup, but it does work for my purposes.
I updated the firmware of which became available today, both EOS R body and RF 70-200. Did not change AF problem discussed here. Still slight front focus at 200mm, like was before the firmware updates.
Not good. On a Facebook forum someone sent in their lens, and Canon could not fix it. Said they were elevating the issue.
Juicce wrote:
I updated the firmware of which became available today, both EOS R body and RF 70-200. Did not change AF problem discussed here. Still slight front focus at 200mm, like was before the firmware updates.
I had confidence this would be resolved easily but I’m less confident now. It’s going to be a tough decision to return mine for a refund because I got a sweet deal on it that I don’t expect to see anytime soon.
As my wife pointed out, I could just enjoy the lens as-is but avoid MFD scenarios. Hopefully in time Canon will release a fix. Has anybody established where this issue begins, as far as focal distance? Perhaps the issue is entirely contained within the MFD of the old EF lenses and the new MFD? So essentially we lose that spec in that case.
I have taken some beautiful and sharp photos with it, at greater distances. So there is that.
Mine reached Canon today. I plan to call them tomorrow to see if I can talk to a tech.
jkochuni wrote:
Not good. On a Facebook forum someone sent in their lens, and Canon could not fix it. Said they were elevating the issue.
I’m not really sure what I’m going to do myself. I would imagine it’s fixable...however I’m an impatient person. Lol.
jdavidse1901 wrote:
I had confidence this would be resolved easily but I’m less confident now. It’s going to be a tough decision to return mine for a refund because I got a sweet deal on it that I don’t expect to see anytime soon.
As my wife pointed out, I could just enjoy the lens as-is but avoid MFD scenarios. Hopefully in time Canon will release a fix. Has anybody established where this issue begins, as far as focal distance? Perhaps the issue is entirely contained within the MFD of the old EF lenses and the new MFD? So essentially we lose that spec in that case.
I have taken some beautiful and sharp photos with it, at greater distances. So there is that.
Mine reached Canon today. I plan to call them tomorrow to see if I can talk to a tech.
It’s actually just arriving today for repair. Hopefully I get it back next week. Jesse Evans wrote:
I believe @jkochuni@ is supposed to get his lens back from Canon today, keep us posted!
Just for the record, and for the purpose of testing, I checked my Sigma 150-600 Contemporary with the same setup I used for my 100-400 II near minimum focus distance with similar results. That is to say, no issues on that EF mount lens either.
My opinion is that it's merely a firmware issue (either lens, body, or both). A miscalculation being made at/near minimum focus distance that can be easily fixed by Canon.
