FS7: To Speedbooster or not to Speedbooster

I used it for a bit but decided to stick with my regular Mark IV adapter. Some of my lenses had increased distortion and CA that was distracting. I didn't need the benefits of it anyways for my uses.
 
I shoot quite a bit with the Speedbooster ULTRA on the FS7 and CA has not really been a big issue for me. Two things I noticed:
The bokeh looks different when using the speedbooster, in a nice way. That's the plus side.
When shooting with the Canon 24-70 the lens gets a stop darker on the 70mm end. This also happens to a lesser extent without a speedbooster, but exposure changes on zoom lenses are somehow magnified by a speedbooster.
 
I've seen CA with the Canon 24-105 and speedbooster also, but my reaction was to dump the 24-105 rather than the speedbooster as I haven't seen it with other lenses. My assumption has been its a weakness of the 24-105 though I could be wrong. Its the only lens I've heard this about though.
 
We will be shooting with a lot of back light and into bright windows so I'm going to have to do some tests once we get a little closer to our shoot date. Easy enough just to play it safe and use the standard adapter.
 
I have a dumb commlite adapter, but compared to my metabones, it flares a lot more (and not in a good way)
 
gene_can_sing said:
I have both. For run and gun I mainly use the Speed Booster with the Canon 24-105 f4 which makes it a 17-75 f2.8 which is quite ideal for Run/gun.
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Please correct me if I'm wrong because I only am wanting to learn here, but wouldn't a Speed Booster on your Canon 24-105mm lens on the FS7 actually make it a 24-105? Unless I'm wrong here, a 24-105mm lens adapted (no SB) to a Super 35 camera like the FS7 would actually make the lens a 36-158mm equivalent field of view. Once you swap the adapter for a SB, the lens then becomes a 24-105mm field of view, not a 17-75mm FOV. At least that's what I've always thought.

I am using a Canon 28-300 L on a SB to keep the 28-300 range, but sometimes I'll put on a regular adapter to gain focal length, thus giving me the Super 35 range of 42-450mm.
 
Joshua Milligan said:
Please correct me if I'm wrong because I only am wanting to learn here, but wouldn't a Speed Booster on your Canon 24-105mm lens on the FS7 actually make it a 24-105? Unless I'm wrong here, a 24-105mm lens adapted (no SB) to a Super 35 camera like the FS7 would actually make the lens a 36-158mm equivalent field of view. Once you swap the adapter for a SB, the lens then becomes a 24-105mm field of view, not a 17-75mm FOV. At least that's what I've always thought.

I am using a Canon 28-300 L on a SB to keep the 28-300 range, but sometimes I'll put on a regular adapter to gain focal length, thus giving me the Super 35 range of 42-450mm.
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Not completely wrong, but confusing frames of reference. Put a focal reducer on a 24-105, and it will give you a similar FOV to putting an (uncorrected) 17-75 on the same camera, with the added bonus of faster effective aperture (I haven't done the maths, trusting Gene's figures). Don't bring in 35mm equivalence - it's not being discussed here.
 
I'm currently using the speedbooster ultra with my FS7. I want to get a smart adapter, which one do people recommend? Shoudl I stick with metabones smart adapter iv or are there any other options worth looking at that are just as good (and maybe cheapter)? Such as:

http://www.bhphotovideo.com/c/product/1234034-REG/sigma_89e965_mc_11_mount_adapter_for.html

Edit: I see the sigma adapter has not been released yet...looks really promisiing though. I will be per-ordering it.

Thanks!
 
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Speedbooster + Nikon manual glass for me
The Older Nikon glass is great, easy to match and they take off some of that overly sharp look you get with modern glass and digital cameras
They're affordable and abundant

+1 on getting a dumb adapter too.
I only use the speedbooster if I need an extra stop or for getting wide

Otherwise I use a dumb adapter

Canon speedbooster relies on circuitry for the aperture, so there's an extra level of failure
 
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Gentlemen, please forgive my super-naive question, but I never worked with Canon EF and Speedbuster adapter so I know nothing except it will give you focal lengths of the FF lens on the S35 imager (plus 1 stop gain in light). Here is my question: why have nobody come up with a similar FF Sony E-mount lens (like the SELP 28-135) to E-mount adapter? Basically E->E, but with "Speedbuster" inside... It would be so nice to get the FS7 kit lens wider and faster... Isn't it possible optically, mechanically, or both?

Please be kind with me; Thanks :)
 
^^ The Speedbooster is occupying the same, rather large space, that a dumb adapter also occupies. That space is required to get the Canon lenses back to the same distance from the sensor as on a Canon camera. This is called the "flange focal distance." The difference between the Canon mount and the Sony mount is about 26 mm, so that is the size/ width of the adapter or Speedbooster.

When mounting a Sony E mount full frame (FE) lens on a Sony E mount camera, you need to keep the same standard "Sony" distance to the sensor. So there is no room for the glass required for a Speed booster to work it's "magic."

+++

You might be interested to know that I used to adapt my manual focus Nikon lenses to my Canon DSLR about 12 years ago. That worked because the flange focal distance- from the back of the lens to the sensor plane- is similar, but just slightly longer on the Nikon. So the adapter was just a few mm thick.

No room for glass, but it was fun to adapt the older lenses even then. I still have a Nikon 24mm 2.0, Contax Yashica 28 mm 2.8, etc from those days.

ETA: Here is an article from Wikipedia about "Flange Focal Distance." They note that the FFD for Canon is 44 mm, and 46.5 for Nikon. The FFD for Sony E mount is 18 mm:

https://en.m.wikipedia.org/wiki/Flange_focal_distance

I hope that helps?

Cheers!
 
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moldcad said:
Thanks! So I suspected - the flange length of E-mount is the limitation...
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No, not only.

Speedbooster concentrate the light of a Full Frame lens onto a Super35/APS-C sensor size. You would need a lens producing a bigger image circle than Full Frame to do this, like Medium Format lenses.
 
Bringing this thread back....

I am looking at the Canon CN-E Cinema primes that come in both T1.3 AND T1.5 to be used on my FS7/FS5 (Super 35mm format) and A7Rii (Full Frame 35mm format) cameras.

I obviously need a standard non 0.71x version (which comes without the speed-booster feature) for use on the A7rii so I am definitely getting that. It can also be used on my FS5/FS7 but I will be dealing with full frame to Super 35mm crop factors so a 50mm T1.3 lens will act like an 85mm on the FS5/FS7 which isn't always a bad thing and will give me multiple focal lengths out of one lens which in my mind is an added plus.

https://www.bhphotovideo.com/c/product/1314028-REG/metabones_mb_ef_e_bt6_canon_ef_e_mount_t.html

However a lot of people also recommended that I buy the Metabones Cine (0.71x Speed-booster version) as it would allow me to use the lens on the FS5/FS7 and there would be no crop factor (optimizing more focal lengths out of one lens). My concern is that there is no "non speed-booster version" in the 0.71x version and I am concerned as to how an already extremely fast lens at T1.3 will perform when speedboosted? Does anyone have any experience with this? Will it still retain its sharpness across the frame?

https://www.bhphotovideo.com/c/product/1314029-REG/metabones_mb_spef_e_bt3_canon_ef_e_mount_t.html
 
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