Sony A7R M2 with canon lenses

Pranitsbhoyar said:

Hi bakhtyar kurdi,

First of all thank you for your answer.

Do you have any experience with sigma 24-70mm f/2.8?

I was thinking it will work with tha A7R M2.

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bakhtyar kurdi said:

I have Sony A7RII, Sigma mc-11 and Canon 24-105/4 IS

The auto focus is really fast, as fast as native lenses, but there is a few problems.

First the focus is fast, but not accurate,...

So it could be my Copy of 24-105, I don't really know, but be prepared for problems with any lens with built in IS.

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rjjr said:

bakhtyar kurdi said:

I have Sony A7RII, Sigma mc-11 and Canon 24-105/4 IS

The auto focus is really fast, as fast as native lenses, but there is a few problems.

First the focus is fast, but not accurate,...

So it could be my Copy of 24-105, I don't really know, but be prepared for problems with any lens with built in IS.

Click to expand...

I had similar issues with my Canon EF 24-105/4 L IS with the CM-11 on my A6300. Since my camera is APS-C I replaced the Canon lens/adapter combo with the Sony PZ 18-105/4 G OSS which works much better, has more range, less CA and better IQ on my A6300.

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bakhtyar kurdi said:

rjjr said:

bakhtyar kurdi said:

I have Sony A7RII, Sigma mc-11 and Canon 24-105/4 IS

The auto focus is really fast, as fast as native lenses, but there is a few problems.

First the focus is fast, but not accurate,...

So it could be my Copy of 24-105, I don't really know, but be prepared for problems with any lens with built in IS.

Click to expand...

I had similar issues with my Canon EF 24-105/4 L IS with the CM-11 on my A6300. Since my camera is APS-C I replaced the Canon lens/adapter combo with the Sony PZ 18-105/4 G OSS which works much better, has more range, less CA and better IQ on my A6300.

Click to expand...

Surprisingly I didn't have any problem when I was using Canon 24-105/4 on my Sony a6000, the focus was spot on at all focal ranges.

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bakhtyar kurdi said:

I have Sony A7RII, Sigma mc-11 and Canon 24-105/4 IS

The auto focus is really fast, as fast as native lenses, but there is a few problems.

First the focus is fast, but not accurate, it is always front focusing, not a little bit, but the focus is far far away from the focus point, and it does it constantly, there is no way to fix it except changing to manual focus, so for me it is useless, probably you can show it on Youtube how fast focusing, but nobody talking about accuracy.

The second problem is with image stabilization, or steady shot in Sony language, you can't disable or enable steady shot on the camera, the IS switch on the camera is acting like on-off steady shot, so if it is on, both the camera steady shot and the lens IS work at the same time, and in most cases runes the pictures .

So in theory you have fast auto focus, and two kind of image stabilization, but in real life the only useful thing about this combo is controlling the aperture through the camera, and any cheap $50 ebay adapter can do that.

but it is not the case with all lenses, for example it turns my Canon 70-200/4L (no IS) in to a miracle, it is blazing fast,with the steady shot you get sharp pictures at 1/20sec at 200mm, and the most important for me, the focus accuracy is dead on constantly and every time.

The Canon EF 85/1.8 also works the same way.

So it could be my Copy of 24-105, I don't really know, but be prepared for problems with any lens with built in IS.

I have also the Techart III adapter, that is much more advanced when it comes to IS options, you can disable in camera steady shot, put the lens IS to on, and it works as it was on Canon cameras, you can switch the lens IS to off, put the Camera steady shot to on, and it works as you have a Sony lens on it, or you can disable both.

So I recommend the Sigma for Canon lenses that has no IS.

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bakhtyar kurdi said:

I have Sony A7RII, Sigma mc-11 and Canon 24-105/4 IS

The auto focus is really fast, as fast as native lenses, but there is a few problems.

First the focus is fast, but not accurate, it is always front focusing, not a little bit, but the focus is far far away from the focus point, and it does it constantly, there is no way to fix it except changing to manual focus, so for me it is useless, probably you can show it on Youtube how fast focusing, but nobody talking about accuracy.

Click to expand...

Pranitsbhoyar said:

Hi all...

I am thinking tosony A7R M2, sigma MC-11 adapter and sigma 35mm 1.4 DG HSM art or 50mm 1.4 DG HSM art.

I am also thinking to use canon lens - canon ef 24-105mm f/4l is usm and canon 70-200 f2.8 is ii.my purpose is wedding photography.Dose sigma mc-11 support canon ef 24-105mm f/4l is usm?

Can anyone please help me on this?

I am very confuse.

Thank you

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What is Focus Shift?

photographylife.com

Philnw2 said:

Pranitsbhoyar said:

Hi all...

I am thinking tosony A7R M2, sigma MC-11 adapter and sigma 35mm 1.4 DG HSM art or 50mm 1.4 DG HSM art.

I am also thinking to use canon lens - canon ef 24-105mm f/4l is usm and canon 70-200 f2.8 is ii.my purpose is wedding photography.Dose sigma mc-11 support canon ef 24-105mm f/4l is usm?

Can anyone please help me on this?

I am very confuse.

Thank you

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https://photographylife.com/what-is-focus-shift

You talked about there being a bug with the ef 24-105 f4 regarding regarding focusing and MC-11 adapter.

Read the above article on Focus Shifting. It really isn't a bug with the MC-11 and can happen with any adapter or without using adapters at all. Its more a property of the lens design and the amount of focus shift can vary with the aperture specified.

The problem has to do with specifying a small aperture to take the picture and AF. Many cameras open up the aperture automatically to do the AF, and then stop down to the aperture setting specified by the photographer. On some lenses (perhaps many lenses ), the AF point can shift from wide open to the stopped down aperture for the composition. And lenses vary according to their design as to their being prone to focus shift.

If you want to confirm that this is the problem:

A. Shoot with aperture set wide open and measure the accuracy of the focus on a focus chart or by visually looking at the results

B. Shoot with a very small aperture like F8 using AF. The camera should open up to a large aperture like f2.8 or wider to focus, then stop down to your specified F8. If your lens has a focus shift problem, then the F8 shot should show a softness that didn't appear when shot wide open. (Just thinking about this - your zoom lens may have more focus shifting problems at wider focal lengths than longer focus lengths - not sure about this last sentence) Anyway, i've been told that lenses vary according to their sensitivity to this problem. Its not a bug that the adapter designers can do anything about. Shoot everything wide open will solve the problem

Understanding the problem is an important first step to avoiding it.

--
Phil B

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