Sigma 24 - 105 on FS700 Speedbooster

M

Martin.G

Well-known member
Have anyone tried this combo yet?

The Canon 24-105 has certain issues with the Metabones, like a couple of stops exposure differences between 24 mm and 105 mm. I am certainly willing to trade off the watersealing to get a more RnG friendly lens on my FS700. So i am hoping that the Sigma 24-105 communicates better with the camera.

Ofcourse the lens is newer than the speedbooster itself, so chances are its not going to be any better.
 
I've got both and the Sigma zoom communicate perfectly (F stops, iris control and image stabilization) with the FS700 via the Speedbooster.

Really a great combo !

And what your logic about the Sigma being newer so it won't benefit of the Speedbooster ?

The Speedbooster is a focal reducer so any full frame primes or zooms from past present and future will benefit from it.
 
No i am thinking about the digital side of communication. The Metabones are made to be firmware upgradeable.

Some lenses does not work digitally with the Metabones adapters, as stated on their webpages. But that does not apply to this lens then, good to hear!

Is the Sigma lens darker when zoomed in? Do you have to compensate with exposure when changing focal length?
 
Hmmmm. My Canon 24-105 f4 works perfect on my Speed Booster as it's the lens I use the most on the Booster. The only lens I have regular problems with on both Booster and Regular Metabones is the Canon 100mm Macro f2.8 L. Sometimes it will freeze the camera when powering on. Then I have turn the camera on without the lens on, then screw the lens on. Then it works.
 
Both my Canon 24 - 105 f/4 and Canon 28-300 f/3.5 - 5.6 is variable in T values when zooming. Regardless of f stops. Its natural since less light is transmitted. To combat this, theres a hole mechanism similar to the aperture that follows the zoom function and compensates. This obviously does not work properly when using my Metabones. I have a Speedbooster from one of the first batches. That may or may not be the problem.

But then again the Canon 24 - 105 is soft and has some other issues too. And the Sigma 24 - 105 just appeared on sale, so i put in an order.

http://metabones.com/article/of/maximum-aperture

This may be worth a try. Some lenses require manual registration. Allthough most EF should already be registered, it should not hurt to try as it takes 10 seconds.
 
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Canon 24- 105 not better after using the lens registration technique.

However the Sigma 24 - 105 does not have this zoom-darkness issue, so now i have a new lens thats sharper and better.
 
I've been looking into that Combo too - is the Sigma parfocal? I believe the Canon is? The big downside of the Canon is indeed the light-loss while zooming. looking Forward to your findings!
 
Theres a few cm missing on the zoom focus.

IS is not working either. Will look into that now.

Edit:

This needs more testing, but right now i know that when attaching the lens directly to the speedbooster can result in IS not initialising. Remove Speedbooster with Lens attached, reattach and voila. IS is good to go.

http://www.metabones.com/article/of/green-power-save-mode

Advanced mode AUTO IRIS works :)

Setting the Speedbooster in Advanced Mode also gives the lens more power. Now the Steadyshot option in the menu is even available, and the STD icon is showing properly in the display too. Nice!

Edit 3:

Advanced Mode does not fix the Canon 24-105 light-loss.
 
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No light falloff when zooming with the Sigma.

It's not parafocal unfortunately.

I always attach the Speedbooster with the lens on it.
 
I have not done this previously, and have had few issues apart from this light-loss with the 24-105.

But when i use the Advanced Mode (hold the minimum aperture button) on the Speedbooster, it jumps straight into action. No need to open up into the sensor area, getting prone to dust infront of the ND`s.
 
stefanhuberfilms said:
Does it get parfocal when closing down to f5.6 or f8?
Click to expand...

Its sufficiently parfocal for my taste, out of the short test i did now in 4K mode with 2x O7Q zoom.

I tested with 5.6 in Speedboster, meaning f/8. Will try f/4 (5.6) later on.

Very nice sharpness on the Sigma lens. The quality feel is also in the top tier. I may say this is love at first touch.
 
As far as I know there' no light loss issue with the Canon 24-105 because of the speedbooster - the transmission changes with the focal length even on canon cameras.
It's due to the design. I still like it as allround lens and did tons of footage with it.
The bigger problem for me is the flare resistance. It's a problem especially on the speedbooster.

The Sigma has more CAs what makes it unattractive at least to me, as it's nearly impossible to correct these in post. I was hoping for the Sigma but it's not really a big improvement.
It's a little sharper - better transmission by approx. 1/2 stop, but more CAs and more weight/size.

I'll keep the Canon...
 
I tested it with my Canon 5D, exposing to the right while blowing some tiny specs. When zooming out, the blown highlights did not grow.

Doing the same thing on the speedbooster/FS700 blows out the entire window, while zooming in makes the shot 1-2 stops darker.

This is incredibly hard to correct in post smoothly. Thus, i will keep the sigma. For beautyshots i will use other Canon L primes anyway.


Another great feature on the Sigma that i just thought of, is how incredibly silent the IS is. On the Canon you can ruin the audio recording from the cams shotgun mic while using IS. Whereas on the Sigma, i had to put my ear right onto the lens and still had troubles hearing if IS was activated. Nice!
 
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Martin.G said:
Its sufficiently parfocal for my taste, out of the short test i did now in 4K mode with 2x O7Q zoom.

I tested with 5.6 in Speedboster, meaning f/8. Will try f/4 (5.6) later on.

Very nice sharpness on the Sigma lens. The quality feel is also in the top tier. I may say this is love at first touch.
Click to expand...
Sounds great! Thanks! I will hold on a little more, and see what the new sony zoom does, or even the 18-105 PZ lens with the announced distortion correction FW upgrade. Don't like software corrections though - the sigma could be a winner here, definiteley on the wide side compared to the Sony's!
 
I'm right there with Gene-can-sing and Erik, NO light loss when zooming on my Canon 24-105mm and Speedbooster. It has been a fantastic Run N Gun lens and I have put it through it's paces on tons of gigs for this last year. Sure the SIGMA rocks, just wanted to point out that problem being brought up about the Canon lens has not come up for me.

I got my Speedbooster pre-ordered before it even came out so I had the first firmware and now, just as of 3 weeks ago received back my Speedbooster from Metabones in TOKYO with the latest firmware and it still works fine. The only new thing that happens now though with the latest firmware is, when I switch aperature, sometimes the exposure pops super bright for a split second. That did not happen with the original firmware. The Canon 24-105mm is the only lens I use with the speedbooster that I am electronically controlling as all my primes are manual. The OVEREXPOSED split second jump does not appear when using manual glass.
 
And right you are, if you do not have any light-loss issues. I have had my 24-105 for many years. Even the red L ring has worn off my lens after heavy use. The drawback of using cheap cinematic equipment such as the Speedbooster and even FS700 is sadly inconsistensy and lower quality.

Many have problems with the 24-105, while equally many does not have problems. I also have a preorder version with firmware 16 on my Speedbooster. However, i also have the problem with the original Metabones. Maybe its my lens copys firmware, or my FS700. The Sigma however has become my solution, and its cheaper to swap it out than me wasting hours and hours of debugging my Canon lens.
 
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