Metabones Speed Booster

jpardon said:
With the Speed Booster, my Canon 70-200 f2.8L II effectively becomes a 70-200 f2.0 with a FF FOV. With the original Metabones Smart Adapter my Canon 70-200 f2.8L II effectively becomes a 105-300 f2.8 with a S35 FOV.

Right?
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Easiest way to figure it out is to stay with one FOV. Pick either the FF or the S35 (now you are using it on a Super 35 camera so
I would of course pick the S35 FOV as it just makes most sense. If you are a FF still photographer, than maybe it is easier for you
to think in FF FOV.) Anyways, if you are thinking in FF terms, you will get approximately 70-200mm (with the speed booster)
and the 105-300mm (with original adapter). If you are more used to using S35 FOV (as I am) you would get approximately
50-150mm (with the speed booster) and 70-200mm (with original adapter). Numbers aren't exact but close. You are NOT going to
get a 105-300mm Super 35 FOV out of a 70-200 lens! That is the exact OPPOSITE of what the speed booster does!
 
alaskacameradude said:
You are NOT going to
get a 105-300mm Super 35 FOV out of a 70-200 lens! That is the exact OPPOSITE of what the speed booster does!
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OK, I see what you are saying about sticking with one FOV. So the following would be a more accurate way to put it: "With the Speed Booster, my Canon 70-200 f2.8L II effectively becomes a 70-200 f2.0 with a FF FOV. With the original Metabones Smart Adapter my Canon 70-200 f2.8L II effectively becomes a 105-300 f2.8 with a FF FOV."

 
jpardon said:
Practically speaking, switching between using the Metabones Speed Booster and the original Metabones Smart Adapter would be a similar workflow to using a teleconverter, no? I know it wouldn't be *technically* the same because the FOV would be different....but *practically* speaking would it not be similar?

With the Speed Booster, my Canon 70-200 f2.8L II effectively becomes a 70-200 f2.0 with a FF FOV. With the original Metabones Smart Adapter my Canon 70-200 f2.8L II effectively becomes a 105-300 f2.8 with a S35 FOV.

Right?
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It is the same workflow to a teleconverter because it is a focal length converter just like a teleconverter. Why wouldn't it technically be the same? It's the opposite of a 1.4x teleconveter (focal length extender) because it is a focal length reducer.

That's one of the issues I have with people talking about "equivalent" focal lengths, they usually convert to equivalent focal lengths but not to equivalent f-stops. That can get really confusing for most people.

With the speed booster on S35, the 70-200 f2.8 will give you an FOV roughly the equivalent to a 70-200 f2.8 on FF35... You are not wrong, but its pretty confusing to say it has the field of view of a 70-200 on FF35 but the f-stop/dof of a 50-140 f2.0 on S35. It's true, but for the sake of communication and avoiding misinterpretation you aren't really helping anyone with that explanation.

Oh yeah but that last sentence is wrong.
 
Originally Posted by alaskacameradude
You are NOT going to
get a 105-300mm Super 35 FOV out of a 70-200 lens! That is the exact OPPOSITE of what the speed booster does!


Ummm, That is exactly what you get when mounting a 70-200 lens on a S35 sensor with the original EF-E mount.
 
mcbob said:
For what it's worth, I sent Metabones an email requesting earlier release of a dumb EF-MFT speedbooster based on its flexibility to other mounts.
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I did the same, and I would say anyone wanting MFT EF Passive should email them and let them know, because it does not look like they're planning on delivering one at all, only a smart mount and that will be much later. Until then we'll be stuck with Nikon etc, which IMO are not good options. =T
 
OK let me add this thread to wikipedias definition for the word "confusion".
Such a simple concept + so many "experts" = (you guessed it) confusion haha
In the spirit of this thread: how about just treating it like reversed 1.4x extender?
just replace the word "increase" with " decrease" and "loss" with "gain"...:thumbsup:
 
John Foundas said:
Originally Posted by alaskacameradude
You are NOT going to
get a 105-300mm Super 35 FOV out of a 70-200 lens! That is the exact OPPOSITE of what the speed booster does!


Ummm, That is exactly what you get when mounting a 70-200 lens on a S35 sensor with the original EF-E mount.
Click to expand...
No it isn't!!! You might get a 105-300mm from a FF FOV but it is a 70-200 Super 35 FOV!! A 70-200
is a 70-200 on a Super 35 when you use the original Metabones adapter! When you use the speed booster
it does NOT get longer....it gets wider! First thing you need to do is set the baseline.
Are you going to talk in FF FOV or Super 35? From Super 35 FOV you are getting (approximately)
50-140 and 70-200. From FF FOV you are getting 70-200 and 105-300.
 
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jpardon said:
OK, I see what you are saying about sticking with one FOV. So the following would be a more accurate way to put it: "With the Speed Booster, my Canon 70-200 f2.8L II effectively becomes a 70-200 f2.0 with a FF FOV. With the original Metabones Smart Adapter my Canon 70-200 f2.8L II effectively becomes a 105-300 f2.8 with a FF FOV."
Click to expand...

Exactly!
 
optitek said:
OK let me add this thread to wikipedias definition for the word "confusion".
Such a simple concept + so many "experts" = (you guessed it) confusion haha
In the spirit of this thread: how about just treating it like reversed 1.4x extender?
just replace the word "increase" with " decrease" and "loss" with "gain"...:thumbsup:
Click to expand...

The problem is too many people are flipping between FOV's. Pick either FF or Super 35 and
stay with it for both calculations!
 
nyvz said:
Yes you are confusing yourself with crop factor speak which is a common confusion. A 50mm is not a 75mm on the FS700, a 50mm is a 50mm on an FS700. It would be accurate to say a 50mm on a FS700 has a similar FOV to the FOV a 75mm would render on a FF35 camera. But without any additional optics, a 50mm is a 50mm no matter what sensor or film put behind it. You will always be confused if you think primarily in terms of crop factors and "equivalent focal lengths" since "equivalent focal lengths" are not real focal lengths and you are talking like you think equivalents are actual focal lengths. It would be better to simply understand the correlation between actual focal length and actual FOV for whatever format you are using. FF35 FOV comparisons are really only useful if you have only ever used FF35 before and are not familiar with the perspectives and effects you get from focal lengths on any other format. If you don't use FF35 that much, just get used to what the focal lengths look like on the format you are using.
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Thanks Noah, that made everything clear to me. I'm just used to always compare with a full frame, so got my self confused.
 
According to tracking, my metabones speed booster just arrived in the USA, its almost here! Hong Kong post seemed to say delivery times are under 5 days, that seems awfully fast from all the way around the world.
 
nyvz said:
According to tracking, my metabones speed booster just arrived in the USA, its almost here! Hong Kong post seemed to say delivery times are under 5 days, that seems awfully fast from all the way around the world.
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im right over in astoria and have a 28mm 1.8 that would be interesting to test out...
 
imdjay said:
im right over in astoria and have a 28mm 1.8 that would be interesting to test out...
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I'm in Astoria as well! I will probably do some tests with the adapter when it arrives, so if you want to join and test any of your own lenses you are welcome.

If the adapter works as expected, there may not be much, the lenses will just look like they do on a FF35 camera :)
 
Speed booster arrived this morning. It took 4 days total for my order to get processed and shipped Hong Kong to NYC, impressive! Will have to wait until the weekend to play with it since I'm on a shoot all day though...
 
alaskacameradude said:
No it isn't!!! You might get a 105-300mm from a FF FOV but it is a 70-200 Super 35 FOV!! A 70-200
is a 70-200 on a Super 35 when you use the original Metabones adapter! When you use the speed booster
it does NOT get longer....it gets wider! First thing you need to do is set the baseline.
Are you going to talk in FF FOV or Super 35? From Super 35 FOV you are getting (approximately)
50-140 and 70-200. From FF FOV you are getting 70-200 and 105-300.
Click to expand...

Dude calm down, wouldn't we talk in Full Frame field of view seeing as we are adapting Full Frame lenses to S35 here and the point of the adapter is increasing the speed and field of view to have the Full Frame lens behave like a full frame lens when attached to an S35 camera?

e.g, my 70-200mm full frame Nikon lens gives me a field of view of 105-300mm on my S35 camera but with the speedbooster i get a nigh on true 70-200mm Full Frame field of view, the speed is increased and god darn does it look pretty much the same as when its attached to my Nikon D800.

That sound about right?
 
XSVpro said:
Dude calm down, wouldn't we talk in Full Frame field of view seeing as we are adapting Full Frame lenses to S35 here and the point of the adapter is increasing the speed and field of view to have the Full Frame lens behave like a full frame lens when attached to an S35 camera?

e.g, my 70-200mm full frame Nikon lens gives me a field of view of 105-300mm on my S35 camera but with the speedbooster i get a nigh on true 70-200mm Full Frame field of view, the speed is increased and god darn does it look pretty much the same as when its attached to my Nikon D800.

That sound about right?
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Some people talk in FF field of view and others talk in S35 field of view, it usually has to do with
what they are used to. In this case I'm not sure if it makes more sense to talk in FF field of
view......the camera is still S35 after all. But I'm fine either way, just pick one or another as
your baseline and don't switch back and forth.....like the person who tried to say that 'turning a
70-200mm lens into a 105-300mm in Super 35 field of view is EXACTLY what the speed booster does'
That statement is FALSE and contributes greatly to the mass confusion on this topic.
You explained it perfectly in the above example, you obviously understand the concept.
 
alaskacameradude said:
Some people talk in FF field of view and others talk in S35 field of view, it usually has to do with
what they are used to. In this case I'm not sure if it makes more sense to talk in FF field of
view......the camera is still S35 after all. But I'm fine either way, just pick one or another as
your baseline and don't switch back and forth.....like the person who tried to say that 'turning a
70-200mm lens into a 105-300mm in Super 35 field of view is EXACTLY what the speed booster does'
That statement is FALSE and contributes greatly to the mass confusion on this topic.
You explained it perfectly in the above example, you obviously understand the concept.
Click to expand...

I prefer to just avoid talking about "equivalent focal lengths" and crop factors out loud since they just result in a lot of confused people and misunderstandings that take up pages and pages of threads to resolve. I say just do the conversions on your own if you need them and keep it to yourself. Personally I use S35 the most so if I ever compare to anything I use that as my base since I know best what focal lengths I would use on the S35 format. I make a point of always knowing the horizontal dimensions of any sensors I use (many of them vary a bit). It's pretty easy though, since the common lens focal length steps are ~1.5x from one another just like sensor format sizes so you just step up one for each format.

If you are shooting for m43/S35/FF35, I need at least 17/24/35 to have a wide shot, and at least a 50/70/105 for close ups. What else is there to know really? This is especially easy since those wide numbers are approximately equal to the corresponding sensor's width, so I know a 10mm lens on a sensor 10mm wide will be as wide as a 24mm is on s35 or 35mm is on FF35...
 
nyvz said:
Personally I use S35 the most so if I ever compare to anything I use that as my base since I know best what focal lengths I would use on the S35 format.
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+1...

that and s16mm are all i really know.... i rarely use a stills camera, and have never shot vistavision or 70mm....
 
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