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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

 
jlearman
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Jan 15, 2013 11:21 as a reply to  @ post 15490009 |  #16

BUMMMMMER. Totally thought this was for full frame. Canon should make something like that. Of course, they'd sell fewer lenses, so we'll probably never see one.


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tkbslc
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Jan 15, 2013 11:48 |  #17

jlearman wrote in post #15491794 (external link)
BUMMMMMER. Totally thought this was for full frame. Canon should make something like that. Of course, they'd sell fewer lenses, so we'll probably never see one.

If you read the whitepaper, the optical designer mentions that these only work if you start with a larger imaging circle and if you have room to put the adapter in the regular mount depth. So really, it only works going from a larger format to a smaller format with a shallow mount. Presumably it could work adapting Hasselblad lenses to Canon FF. If you went Canon to Canon, you'd end up with a heavily vignetted macro lens.


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djohnfot
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Jan 15, 2013 18:28 |  #18

It's gonna be a hard sell at the msrp of $599 for there are a lot of really good m4/3 lenses available in that range. Price it at, say, $199 and it makes a lot more sense.




  
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jlearman
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Jan 16, 2013 09:07 |  #19

tkbslc wrote in post #15491887 (external link)
If you read the whitepaper, the optical designer mentions that these only work if you start with a larger imaging circle and if you have room to put the adapter in the regular mount depth. So really, it only works going from a larger format to a smaller format with a shallow mount. Presumably it could work adapting Hasselblad lenses to Canon FF. If you went Canon to Canon, you'd end up with a heavily vignetted macro lens.

:idea::idea::idea: Ahhhh, I get it now. Very interesting.... Couldn't it work on crop sensors though & EF lenses though?


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archer1960
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Jan 16, 2013 09:35 |  #20

jlearman wrote in post #15495591 (external link)
:idea::idea::idea: Ahhhh, I get it now. Very interesting.... Couldn't it work on crop sensors though & EF lenses though?

That should work, assuming there is enough difference in sensor size to accommodate the change in image circle size.


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Madweasel
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Jan 16, 2013 11:16 |  #21

jlearman wrote in post #15495591 (external link)
:idea::idea::idea: Ahhhh, I get it now. Very interesting.... Couldn't it work on crop sensors though & EF lenses though?

No, because there's no room for the adapter, as both lenses focus at the same distance from the mount. The one in the article relies on larger-format lenses and shorter-registration bodies.


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250 ­ Gimp
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Jan 16, 2013 14:44 |  #22

I like the concept here, but personally wouldn't pay 600 bucks for it.




  
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raptor3x
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Jan 16, 2013 14:58 |  #23

If they made a 0.5x version for m4/3s I'd have a hard time not buying one along with an EM-5 to get a 70-200 F/1.4 IS II.


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tkbslc
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Jan 16, 2013 16:20 |  #24

raptor3x wrote in post #15497030 (external link)
If they made a 0.5x version for m4/3s I'd have a hard time not buying one along with an EM-5 to get a 70-200 F/1.4 IS II.

with a 2x crop factor giving effective f2.8 aperture


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rwong2k
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Jan 16, 2013 16:40 |  #25

how do you calculate the effective f stops in relation to the crop factor?

so 50mm x1.6 crop = 80mm, that part I get, but for F stops?

hope that question makes sense


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archer1960
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Jan 16, 2013 17:00 |  #26

rwong2k wrote in post #15497528 (external link)
how do you calculate the effective f stops in relation to the crop factor?

so 50mm x1.6 crop = 80mm, that part I get, but for F stops?

hope that question makes sense

ACtually, it doesn't. Crop factor has no effect on focal ratio; only the actual focal length does (as possibly modified by the adapter).


Gripped 7D, gripped, full-spectrum modfied T1i (500D), SX50HS, A2E film body, Tamzooka (150-600), Tamron 90mm/2.8 VC (ver 2), Tamron 18-270 VC, Canon FD 100 f/4.0 macro, Canon 24-105 f/4L,Canon EF 200 f/2.8LII, Canon 85 f/1.8, Tamron Adaptall 2 90mmf/2.5 Macro, Tokina 11-16, Canon EX-430 flash, Vivitar DF-383 flash, Astro-Tech AT6RC and Celestron NexStar 102 GT telescopes, various other semi-crappy manual lenses and stuff.

  
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Madweasel
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Jan 16, 2013 17:18 |  #27

He means in terms of depth of focus. In light gathering you're right.


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tkbslc
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Jan 16, 2013 17:21 |  #28

Also, larger sensors have better high ISO performance roughly equivalent to their crop factor.


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archer1960
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Jan 16, 2013 17:26 |  #29

Madweasel wrote in post #15497722 (external link)
He means in terms of depth of focus. In light gathering you're right.

ok. I rarely worry about DOF with respect to focal ratio; it's light gathering that usually matters to me the most, so I rarely think of DOF unless it's specifically mentioned.


Gripped 7D, gripped, full-spectrum modfied T1i (500D), SX50HS, A2E film body, Tamzooka (150-600), Tamron 90mm/2.8 VC (ver 2), Tamron 18-270 VC, Canon FD 100 f/4.0 macro, Canon 24-105 f/4L,Canon EF 200 f/2.8LII, Canon 85 f/1.8, Tamron Adaptall 2 90mmf/2.5 Macro, Tokina 11-16, Canon EX-430 flash, Vivitar DF-383 flash, Astro-Tech AT6RC and Celestron NexStar 102 GT telescopes, various other semi-crappy manual lenses and stuff.

  
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rwong2k
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Jan 16, 2013 18:23 |  #30

ah thanks guys! much appreciated!


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