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Vaards · 01-15-2013, 04:36 PM

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

Vaards · 01-15-2013, 04:53 PM

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. ;-)

ihasa · 01-15-2013, 04:54 PM

Looks like it only works on MILCs with a short registration distance. Would be great on a NEX!

ihasa · 01-15-2013, 04:55 PM

Ah okay, I missed that thread too.

userage · 01-15-2013, 05:03 PM

Originally posted by Vaards

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

sajah · 01-15-2013, 06:59 PM

Originally posted by userage

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..

**barondla** · 01-23-2013, 07:14 PM

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

Mistral75 · 01-24-2013, 07:17 AM

Originally posted by barondla

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 (à 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.

01-15-2013, 04:36 PM	#1
Vaards Forum Member Join Date: Feb 2010 Location: Helsinki Posts: 94	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, 06:59 PM	#6
sajah Senior Member Join Date: Mar 2009 Location: South Korea Photos: Gallery Posts: 275	Originally posted by userage 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.

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01-15-2013, 04:53 PM	#2
Vaards Forum Member Join Date: Feb 2010 Location: Helsinki Posts: 94 Original Poster	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
ihasa Veteran Member Join Date: Jul 2009 Location: West Midlands Photos: Gallery Posts: 2,066	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
ihasa Veteran Member Join Date: Jul 2009 Location: West Midlands Photos: Gallery Posts: 2,066	Ah okay, I missed that thread too.

01-15-2013, 05:03 PM	#5
userage Senior Member Join Date: Dec 2011 Posts: 198	Originally posted by Vaards 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

01-23-2013, 07:14 PM	#7
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,717	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
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by barondla Think they can get around the register difference if they want. *Think of a telencoverter. It goes between a K5 and a DA300 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 (à 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.

Amazing FF solution!

Win a Pentax Limited Lens: Raffle Now Live!