Focus pulsing issue with canon eos r10

[Ilias_laz]

Hello, I was using an old canon eos 50d with a sigma 17-50mm f2.8 ex dc os hsm, and both worked great (this lens is especially sharp). Recently I decided to invest in mirrorless system as I had read that with ef to rf adapter my ef lenses would work great. Unfortunatelly when I am using this lens with r10 I get a massive pulsing issue when I am focusing with servo mode. I am very dissapointed because there was not any list of compatible third party lenses with new mirrorless cameras. Canon just told that ef lenses would work as good as with dslr cameras. Is there a solution to this problem? 

[rs-eos]

What specific EF to RF adapter did you purchase?

[Ilias_laz]

The official canon adapter, it was on sale along with the camera. I have other lenses too, some of them facing the same issue. My canon ef 50mm f1.8 stm and canon ef-s 55-250 stm are working great with r10. My sigma 10-20 f4-5.6 ex dc os hsm has some minor focus pulsing issues. Sigma 105mm f2.8 ex dg os hsm worls fine but not as fine as canon lenses and my tamron sp af 200-500mm f4-5.6 di ld if has also focus pulsing issue. I undestand that new mirrorless cameras have a different focus mechanism but I am very dissapointed with the fact that canon didn't informed customers about potential incompatibility with specific lenses. 

[shadowsports]

Greetings ,

The 17- 50 is dated and not a sigma global vision lens. I'd be very surprised if it worked properly on a mirrorless camera, even when used with a Canon branded adapter.  

[Ilias_laz]

I agree with that but how should I have known this before as canon didn't mention anytning? I feel scammed from canon 

[Ilias_laz]

If canon had inforned customers that not all ef lenses would work fine on rf cameras I would be ok with that and thinking twice before switching to mirrorless. But now I bought a new camera to find out that some of my lenses are not compatible and not wornikg properly. Shadowsports replied above that this lens is old but this is an excuse to the problem as there is not newer aps-c zoom lens with f2.8. Even canon's 17-55 f2.8 is older than sigma lens. 

[rs-eos]

Canon would only test their own lenses though.   Using third party products can lead to compatibility issues; be it hardware or software.

[kvbarkley]

For the lenses that support it you can see if they have any software updates to make them more compatible with the R's.

[shadowsports]

Hi IIias_laz,

This has been brought up elsewhere.  I don't know if we can provide you with an answer you will be satisfied with.  I do not see how its Canon's responsibility to ensure a 3rd party lens or hardware works with their product or device, unless claimed. The same way its not Sigma's responsibility to ensure a Canon product works on one of their cameras. If you put a 3rd party product on a Sigma camera body, would you expect Sigma to be sure or even know if it worked? Unfortunately, not. They didn't make it or have any control in its design.

Canon does tell you what lenses work with their adapters:

Usable Lens                                                Canon EF lenses
Excludes RF lenses, EF-M lenses, CN-E lenses (EF cinema lenses)

If you visit Sigma's website for the 17-50, there is nothing there that says what cameras or body's this lens will work with. It states compatible mounts are x, y, z. They do not call out what it does or doesn't work with.

Sometimes things work well together, and sometimes they don't. Canon's lenses work with Canon's body's. Canon does publish a compatibility matrix with the majority of their camera's telling you what Canon products and accessories work together and what doesn't. They cannot be responsible for other products they do not control or manufacturer.

Would it be great if all 3rd party lenses worked with every body Canon, Nikon, Sigma, Panasonic, Sony, etc made. Of course, but its not possible and no where do any of these manufacturers claim they do so.

I own Sigma glass myself that worked great with other Canon bodies I've owned. Some work well adapted, and others not so much. Would I like them to work 100%, yes.  Is it Canon's fault if they don't, I don't believe it is.  This is my personal view.  I understand your disappointment and am sorry you feel deceived.

[Ilias_laz]

What you are saying is common sense, every company tests their own products, I don't expect canon to test all available lenses ever made. But DID canon inform customers that third party lenses may not work properly with new mirrorless cameras? I've loved canon all these years and now I was planning to invest more on canon r system, even on full frame bodies and lenses. But to be honest I am disapointed from canon's customer treatment. Instead of trying find a solution you are trying to say that it was my fault expecting new canon cameras to work well with old ef lenses, without previous beeing clear from company that there may be a compatibility issues. Thanks for your time replying to my post but now I unestand how in canon treat their customers.