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01-15-2013, 04:36 PM   #1
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Amazing FF solution!

It seems even better than fulframe. Approx. costs = 600$
Although there is no Pentax mount at the moment. But worth to mention here!

White Paper of product: Metabones Speed Booster

01-15-2013, 04:53 PM   #2
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Sorry People, JUst tried different keywords and found thread about Metabones Speed Booster here:
https://www.pentaxforums.com/forums/non-pentax-cameras-canon-nikon-etc/211879...r-adapter.html

Please write comments there - to not make double discussions. ;-)
01-15-2013, 04:54 PM   #3
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Looks like it only works on MILCs with a short registration distance. Would be great on a NEX!
01-15-2013, 04:55 PM   #4
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Ah okay, I missed that thread too.

01-15-2013, 05:03 PM   #5
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QuoteOriginally posted by Vaards Quote
It seems even better than fulframe. Approx. costs = 600$
Although there is no Pentax mount at the moment. But worth to mention here!

White Paper of product: Metabones Speed Booster
Most likely will never be in Pentax mount because if there was it would probably only be useful for macro as it would act like an extension tube
01-15-2013, 06:59 PM   #6
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QuoteOriginally posted by userage Quote
Most likely will never be in Pentax mount because if there was it would probably only be useful for macro as it would act like an extension tube
Lens-side mount or camera-side mount? Camera mount, well they don't make for Canon and Nikon mount too, because like you said it'll only useful for macro. Lens mount, it's possible to buy the Canon one paired with PK to EOS adapter.

Oh I forgot about their mirrorless (Nikon series 1 and Canon M), yes maybe they will make for those (camera) mounts in the future. But hey we have mirrorless too, K-01. Theoretically, Metabones can make a special one for Pentax K-01 which will be put inside the mount, since K-01 has no mirror. But realistically though, even if it's possible I don't think they'll ever make one..

Last edited by sajah; 01-15-2013 at 07:36 PM.
01-23-2013, 07:14 PM   #7
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Think they can get around the register difference if they want. Think of a telecoverter. It goes between a K5 and a DA*300 and still focuses to infinity. Probably possible with a telecompressor to. Once optcs are added to an adapter many things are possible.
thanks
barondla
01-24-2013, 07:17 AM   #8
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QuoteOriginally posted by barondla Quote
Think they can get around the register difference if they want. Think of a telencoverter. It goes between a K5 and a DA*300 and still focuses to infinity. Probably possible with a telecompressor to. Once optcs are added to an adapter many things are possible.
thanks
barondla
Of course because a teleconverter (diverging group) moves the image plane farther from the lens (from the original lens): all you have to ensure is that the teleconverter's thickness is equal to this move.

A focal reducer (converging group) moves the image plane closer to the lens so you cannot use one between a FF/APS-C SDLR lens and a FF/APS-C DSLR body: it would have to have a negative thickness.

(same problem as trying to mount a lens with a shorter register on a body with a longer one).

The only possibility I see is a mirrorless camera with a DSLR mount ( la K-01), the focal reducer being plugged inside the lens mount, and a shift-able sensor or lens mount to compensate for the different register distance with and without the focal reducer inside the lens mount.

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