Mini-Review: YongNuo 2x III TC (Canon Knockoff)

TeamSpeed wrote in post #18468204
I wonder if the firmware is the issue, thus my inquiry about the Canon TC and Sigma lens. They may look the same but what about the software?

I had the Sigma 150-600 Sport. With Canon 1.4TCs, 1.4TCII works with 7D2 but not with 1.4TCIII. I had the updated Sigma firmware, I believe with the original firmware both versions of the Canon 1.4TC would work. I was surprised Sigma did that.

I have a Canon 2X TCIII and have done extensive comparisons with a Sigma APO EX DG 2X. On EF300F4 IS L, EF 100-400 II, EF 200 2.8L, EF 500 F4 IS L, Sigma 150-600 Sport, results were consistent: the Sigma is just slightly better. Slightly sharper, slightly more contrast. Another POTN member found the same results and used two Canon TCs. So either we are both unlucky and have 3 bad Canon TCs between us, or.....

So the Canon 2x III works with the Sigma 150-600?

Talley wrote in post #18468194
ya same design so no won't work either.

Are we sure it is the very same design ?
Canon's designs are all patented, and that should be enough to stop sales of the knockoff lens in many countries.
The 50/1.8 knockoff has a different design than the original Canon.

what i mean is the kenko front of the TC the element doesn't protrude meaning it can fit all lenses. the canon and this yongnou thingy have protruding elements. It won't mount to all lenses... unless they have the rear element recessed in.

TeamSpeed wrote in post #18468279
So the Canon 2x III works with the Sigma 150-600?

It did, but I can't remember body. 1DS2, 1D4 or 7D2.

TeamSpeed wrote in post #18467921
So now I move onto the desire to use this TC on other lenses. Two issues arise out of this. First is that since the front element sticks out on the TC, any lens you have where the rear element moves in and out to being almost flush with the electronic contacts, you cannot use this TC. This could be much like the Canon as well, but I don't know. This means that I cannot use this on my 24-70 or 100 macro, not that I would really want to anyways.

yea as far as i am aware only kenko don't have the protruding part, which was why i originally bought it (since i often stack it with my 100L macro) and still have it despite now also having the sigma 1401 TC

You will probably be able to stack using a 12mm tube between the TCs and still be able to focus on the moon.
I have done this with several long lenses. Some do not have enough focus movement past infinity to allow that.

Choderboy wrote in post #18468523
It did, but I can't remember body. 1DS2, 1D4 or 7D2.

Memory failing of what occurred over 12 months ago...

1D4, Sigma 150-600 Sport and a 2X TC was used for this photo. I know when I tried the Sigma 2XTC and the 150-600 S I got an error with at least one of my bodies due to Sigma's cruel firmware update. I'll check when I get home to see if I can work out which 2XTC this was.

After an update to the Sigma 150 600 sports firmware the Canon 1.4 Mk 3
extender stoped working for me on a 7D2.

On my 5DIII the canon 2xEXIII works(but of course no autofocus), the canon 1.4EXIII gives an error. I contacted Sigma if a (future) software update would change this and their reply was they only support their own extenders.

Like I have found out, different canon models behave differently with the TC and the sigma 150-600. You might find out that the 7d2 and 5d4 throws an error with the 2x and sigma.

Still waiting for somebody that has the canon 2x III and sigma with either of these bodies I mentioned to say they have no issues.

EDIT: So, I forgot I had the SL2, so I tried the YN 2x on the Sigma on it. No overexposure issues, and no errors. Obviously it won't AF when it is at f11. However I can MF the lens and get good results.

So 3 different cameras, same TC and lens, 3 different behaviors....

7D2 - 2.5 stops over exposure on the 70-200II and errors out on the Sigma after I hit the shutter
5D4 - 3 stops over exposure on the 70-200II and errors out as soon as I turn on the camera
SL2 - Exposes perfectly on the 70-200II and has no errors at all with the Sigma

So it appears I have a working combination with the YN 2x and Sigma, and since none of the 3 bodies AF at f11, AF isn't really an issue there.

TeamSpeed wrote in post #18470661
....

Still waiting for somebody that has the canon 2x III and sigma with either of these bodies I mentioned to say they have no issues.....

Oh geez,. guess I'll cave and give it a try. (with Canon TC, don't have Yongnuo)

why haven't I?

Simply put, I would not under any circumstance consider a 2X TC on a 600mm f/6.3 zoom a viable option, and I don't need to try to understand why it will fail.

When/if I do get around to it, I am confident I will be among those that have problems. There is no reason why it should work. Canon says it won't, Sigma says it won't,. so?

CyberDyneSystems wrote in post #18470684
Oh geez,. guess I'll cave and give it a try. (with Canon TC, don't have Yongnuo)

why haven't I?

Simply put, I would not under any circumstance consider a 2X TC on a 600mm f/6.3 zoom a viable option, and I don't need to try to understand why it will fail.

When/if I do get around to it, I am confident I will be among those that have problems. There is no reason why it should work. Canon says it won't, Sigma says it won't,. so?

See my example. I achieved what I wanted but the goal was more documentary. Useful to me as I can see both Osprey are carrying sticks, ie photographic evidence of both sexes involved in nest building. I found I can identify male or female at about 500 metres (a third of a mile). Photo above they were around 320 metres. At that same distance I was able to easily ID a Peregrine falcon. Therefore I am pretty unhappy about Sigma removing the ability to take a photo, if I decide I want to.

Actually, I will use the 2x on the 150-600, but obviously when I need to manually focus. In good sunlight with the pins taped on the Kenko 2x, my cameras would AF and work very well at the zoo safari exhibits

Examples of the Kenko 2x on the Sigma 50-500, for example.

So a few shots today with the 2x and 70-200.