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FORUMS Canon Cameras, Lenses & Accessories Canon Lenses 
Thread started 14 Jan 2013 (Monday) 10:55
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Metabones speed booster - Lens adapter reduces focal length, adds a stop

 
thenextguy
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Jan 14, 2013 10:55 |  #1

What do you guys think?

Very intriguing. Metabones (the Hong Kong based company who created the most renown Canon EF-lens to Sony NEX-camera adapter) introduce an adapter that boosts your lenses speed by 1 f-stop. But there's more...

Not only does this adapter boost your (fullframe) lenses speed, but it also gives you a wider field of view, makes your lens output sharper and adds a shallower depth of field. Does this make sense?

This actually makes total sense and it's weird that no one has though of this before:
It's the principle of lens speed that bringing more lens area onto a smaller sensor heightens the light density thus giving you more speed. Using a bigger portion of your glass on a smaller sensor makes lens faults more irrelevant thus making the image sharper and producing a wider field of view at the same time.

Sample: Your 50mm f/1.4 becomes a very sharp 35mm f/1.0 lens.

http://www.cinema5d.co​m/news/?p=13555 (external link)


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archer1960
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Jan 14, 2013 11:22 |  #2

It's just the opposite effect of a teleconverter, and the same as a focal reducer used in astronomy/astrophotogr​aphy.

It's definitely not going to make your images sharper, but it will reduce the f/l and thereby make the focal ratio faster (lower number).


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BrandonSi
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Jan 14, 2013 11:46 |  #3

I'm pretty sure it's only for mirrorless though.


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Kolor-Pikker
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Jan 14, 2013 13:30 |  #4

This is the same kind of thing used to create Stanly Kubrik's 50mm f/0.7 by utilizing a 100mm f/1 lens with a condenser on the back.

Obviously this reduces the image circle of the lens, so going from full frame on down, you're left with being able to mount this lens on the likes of micro 4/3 and such.


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Jan 14, 2013 13:40 |  #5

Here is the news on dpreview: http://www.dpreview.co​m …er-for-mirrirless-cameras (external link)

Things like this might make transition from DSLR to mirrorless technology (and DSLR lens depreciation) much smoother, so cudos to the designers.

They claim sharper resolution, as the adapter compresses the larger image circle to the smaller mirrorless camera image circle. But this will be sharper image for a shorter FL lens, so not exactly apples to oranges. In terms of angular resolution, no improvement can be achieved. (In fact, it should become worse, because of the additional aberrations of the adapter's optics.)

Also, it's a bit misleading to advertise the adapter as making your lens "faster" - entrance pupil doesn't change, so background blur will not increase. As long as you remember that smaller f-number comes with shorter FL, there shouldn't be confusion though.


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Charlie
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Jan 14, 2013 13:47 |  #6

if they could make something like this to work on the EOS-M, that would be awesome. best of both worlds, faster + working AF = winnar


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jlearman
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Jan 14, 2013 14:31 as a reply to  @ Charlie's post |  #7

Man this thing looks incredible... So when I'm shooting video in low light, my 24-70 2.8 becomes 17-50 1.4?!?! That's insane.


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tkbslc
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Jan 14, 2013 14:41 |  #8

jlearman wrote in post #15487839 (external link)
Man this thing looks incredible... So when I'm shooting video in low light, my 24-70 2.8 becomes 17-50 1.4?!?! That's insane.

Well it's actually 17-50 f2

But you'd have to use a Sony NEX, so you just cost yourself an extra stop+ of ISO noise and with the crop factor you are back to 25-75 FOV anyway. You gain nothing over just using it on a 5D.

But


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thenextguy
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Jan 14, 2013 15:01 |  #9

tkbslc wrote in post #15487896 (external link)
Well it's actually 17-50 f2

But you'd have to use a Sony NEX, so you just cost yourself an extra stop+ of ISO noise and with the crop factor you are back to 25-75 FOV anyway. You gain nothing over just using it on a 5D.

But

Yeah, it's still cool, but not as impressive as I thought. I thought it would work on full frame.


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Jan 14, 2013 15:22 as a reply to  @ thenextguy's post |  #10

This doesn't change the PHYSICAL f/number.

Only the T value.


Just like how all cameras have the same depth of field!


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Jan 14, 2013 15:37 |  #11

Of course it does change the f-number, and it is as "physical" as it gets, but also reduces the FL. (Same way f-number does become larger when using a teleconverter, and it is again very "physical".) Transmission will get slightly worse because more glass is added.


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pyrojim
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Jan 14, 2013 16:31 |  #12

pulsar123 wrote in post #15488190 (external link)
Of course it does change the f-number, and it is as "physical" as it gets, but also reduces the FL. (Same way f-number does become larger when using a teleconverter, and it is again very "physical".) Transmission will get slightly worse because more glass is added.

Right right. I got it backwards. But it does change T value.


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Kolor-Pikker
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Jan 14, 2013 18:02 |  #13

What would be cool for full-frame, is if such an adapter were made for medium format lenses, in order to have an image circle thats still large enough to cover the 36x24 sensor. OTOH, even the fastest MF lenses are about f/2 for say a 110mm, which would work out to be a 68mm f/1.4, not especially impressive.


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Jan 14, 2013 20:22 |  #14

ok from dpreview it says Fuji x mount coming soon,

so I can potentially use my EF lens with AF on a Fuji x-e1?

Or am I reading this wrong?


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tkbslc
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Jan 14, 2013 23:02 |  #15

rwong2k wrote in post #15489460 (external link)
ok from dpreview it says Fuji x mount coming soon,

so I can potentially use my EF lens with AF on a Fuji x-e1?

Or am I reading this wrong?

Sounds like it. And it would make the crop factor on your X-e1 on 1.1x instead of 1.5x.


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Metabones speed booster - Lens adapter reduces focal length, adds a stop
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