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]

Why would Canon or any company be required to mention 3rd party compatibility for new products that they introduce?   The onus is on the 3rd party companies.

e.g. Apple wouldn't test every conceivable piece of hardware that could be attached to a new Mac every time they release a new model.

[deebatman316]

The Sigma 17-50mm F/2.8 EX DC OS HSM doesn't support the Sigma dock for software updates. Since it's an older lens hence "EX" in the name. The lens the OP mentioned above also DOES NOT work properly on the EOS 90D either. So it's not an EF-RF Mount adapter problem. Some 3rd Party EF lenses don't play nicely even on their native mount.

[kvbarkley]

You don't need the dock, you can send it back to Sigma or Tamron if an update is available.

[deebatman316]

I know that older lenses could be re-chipped but I don't known about this lens.

[Waddizzle]

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@Ilias_laz wrote:

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. 

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Not all Canon EF lenses are fully compatible with all features of MILC bodies.  I have not looked through the R10 manual, yet, but manuals for previous cameras, like R through the R5, included a page that listed Canon EF lenses that were fully compatible with the MILC body when using the Canon EF-RF adapters.

No mention is made about any third party lenses because Canon does not test compatibility with third party lenses.  That responsibility resides with the third party lens manufacturers, not Canon.

In my experience with Sigma lenses and Canon DSLRs, the “OS” in Sigma lenses has a tendency to get into a tug-of-war with Canon DSLRs.  Autofocus would go on a hunting expedition.  

Please note, the DSLR bodies had a much lower maximum fps than Canon MILCs.  The focus pulsing looks like a high speed version of the same tug-of-war focus hunting seen with Canon DSLRs.

There was a simple fix for it.  Disable the OS in the Sigma lens.  Problem solved.

[shadowsports]

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@Ilias_laz wrote:

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, ....

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Respectfully.  No where does rs-eos imply or say anything is your fault.  

[shadowsports]

The 17-50 is a dated lens now and as I mentioned, not gobal vision which are the only lenses supported by the Sigma Dock.  The lens is now EOL and sigma won't service it.  Upgrade it, change its mount etc.  I had the 17-70, but let it go, admit reluctantly when I moved to full frame.  I may have been lucky with my copy, but it was truly one of my favorites.

[Waddizzle]

As I pointed out above, Canon does include a list of fully compatible EF lenses in the User Manuals.  I want to add that no EF lenses with initial release dates prior to 2009 are supported. 

[deebatman316]

I own this lens too along with an EOS 40D which are still working but have been retired. Before I decided on a new camera whether that be APS-C and Full Frame. I tested this lens on the EOS 90D which is the successor to the EOS 40D by many years. This lens doesn't work properly with that camera either. It pulses rapidly when OS was enabled or it would miss focus. It also didn't focus well in Servo AF very well. It also had problems in low light requiring a speedlite with the AF Assist Beam enabled. I ultimately went with the 5D Mark IV since I owned a few L lenses anyway.

[deebatman316]

1st Party EF lenses released prior to 2009 do work. But certain features such as support for Movie Servo AF & 12 FPS don't work. Canon has a list of lenses that support the above mentioned features. My dad's old EF 70-210mm F/4 & my old EF 28-135mm F/3.5-5.6 IS USM lenses work when adapted on an R series body via the EF-RF Mount adapter. All functions such as aperture control, AF & IS work. As you said certain features won't work ie Movie Servo AF.