The world's first PK-FE autofocus transfer ring

**UncleVanya** · 11-16-2020, 09:05 PM - **1 Like**

Fotodiox also makes a version of the same type of adapter. They work a lot like the F 1.7x rear converter (but without the need for the teleconverter since the flange focal distance is shorter.

surfar · 11-16-2020, 10:28 PM - **1 Like**

Originally posted by UncleVanya

Fotodiox also makes a version of the same type of adapter.

its a direct copy of TechartPro, you update the firmware on FotoDiox from the Techart website.

bdery · 11-17-2020, 06:16 AM

Originally posted by Mistral75

The Techart Pro Leica M – Sony E autofocus adapter is a bit different. It does not transcode Pentax autofocus protocols into Sony ones and vice versa. Used in conjunction with a Leica M mount lens or pretty much any SLR lens mounted with a lens mount --> M mount dumb adapter, it make the { lens (+ dumb adapter) + Techart adapter } assembly behave like an E mount autofocus lens. In particular, it includes its own helical and focus motor. Focus is done by increasing and decreasing the thickness of the Techart adapter.

Techart PRO Leica M – Sony E Autofocus Adapter – TECHART Adapters

Think of it as the glassless, motorised, M-E mount equivalent of the smc Pentax-F 1.7x AF Adapter.

Thanks for the explanation. It's a bit convoluted, but it does make some sense (and as a user of that TC I understand what you mean clearly) .

ecostigny · 11-19-2020, 09:01 PM

Wow, that is certainly a different approach to turning manual focus lenses into autofocus lenses.

**mlt** · 11-19-2020, 09:29 PM - **1 Like**

Convoluted is one word. On a 61mp A7r iv, that means keeping 3 different mount surfaces (including one that moves) absolutely parallel to the sensor that also moves for shake reduction. What can go wrong.

Breakfastographer · 11-19-2020, 10:54 PM

Originally posted by mlt

Convoluted is one word. On a 61mp A7r iv, that means keeping 3 different mount surfaces (including one that moves) absolutely parallel to the sensor that also moves for shake reduction. What can go wrong.

Not sure what I'm missing here - it was my understanding the adapter controls focus using the mechanism inside the lens, rather than the adapter itself pumping to achieve focus. So where does the moving mount surface come in?

**mlt** · 11-19-2020, 11:24 PM

The Techart adapter has its own helical and focus motor as stated in Mistral’s post above

FotoPete · 11-19-2020, 11:30 PM

Originally posted by Breakfastographer

Not sure what I'm missing here - it was my understanding the adapter controls focus using the mechanism inside the lens, rather than the adapter itself pumping to achieve focus. So where does the moving mount surface come in?

The Monster adapter (OP) will have an in-built motor to drive the lens' autofocus. The Techart method is the "adapter itself pumping" to achieve focus, mainly for Leica M as it is manual focus from the start and using other lens mounts is to just piggy-back on that method.

surfar · 11-20-2020, 12:38 AM

Advice from the manufacturer is to limit the weight of the attached lens,from memory 700gs(?).

EDIT,680gms is FotoDiox limit.

Some people push the limits though and here is the biggest lens Ive seen on the techart.

Youtu.be

Fogel70 · 11-20-2020, 01:37 AM

Originally posted by surfar

Advice from the manufacturer is to limit the weight of the attached lens,from memory 700gs(?).

Some people push the limits though and here is the biggest lens Ive seen on the techart.

In this case it should be the weight of camera that is critical, as the lens is attached to a tripod. With the camera moving during AF.

Mistral75 · 11-20-2020, 03:05 AM

Originally posted by Fogel70

In this case it should be the weight of camera that is critical, as the lens is attached to a tripod. With the camera moving during AF.

Kind of a stretched version of the Contax AX concept.

surfar · 11-20-2020, 04:10 AM

Originally posted by Fogel70

the weight of camera that is critical,

Its a $ony,they don,t weigh much!

Benz3ne · 11-20-2020, 04:24 AM

Originally posted by surfar

Its a $ony,they dont weigh much!

Aside from the first FF lot which were remarkably light, the newer ones are right on the brink at around 650g including battery and SD card. Add a grip and/or flash/etc. and you might tip the 700g balance they specify.
Unless you're considering the APS-C offerings, which are undoubtedly slim.

surfar · 11-20-2020, 04:28 AM - **1 Like**

Originally posted by Benz3ne

the 700g balance they specify.

Funnily,the FotoDiox which is a direct copy says 680gms I think(trying to jog the memory,there was a lot of discussion a few years ago).

---------- Post added 11-20-20 at 10:49 PM ----------

fotoDiox says 680gms, techart is 700gms

someasiancameraguy · 11-20-2020, 06:50 AM

Originally posted by Benz3ne

Aside from the first FF lot which were remarkably light, the newer ones are right on the brink at around 650g including battery and SD card. Add a grip and/or flash/etc. and you might tip the 700g balance they specify.
Unless you're considering the APS-C offerings, which are undoubtedly slim.

At that point if you grip the body really hard even if the lens is mounted on a tripod you'll probably cause the AF motor to stall.

11-20-2020, 04:10 AM	#177
surfar Pentaxian Join Date: Jan 2015 Location: mid nth coast,nsw Photos: Gallery Posts: 6,141	Originally posted by Fogel70 the weight of camera that is critical, Its a $ony,they don,t weigh much! Last edited by surfar; 11-20-2020 at 04:23 AM.

11-20-2020, 04:28 AM - 1 Like	#179
surfar Pentaxian Join Date: Jan 2015 Location: mid nth coast,nsw Photos: Gallery Posts: 6,141	Originally posted by Benz3ne the 700g balance they specify. Funnily,the FotoDiox which is a direct copy says 680gms I think(trying to jog the memory,there was a lot of discussion a few years ago). ---------- Post added 11-20-20 at 10:49 PM ---------- fotoDiox says 680gms, techart is 700gms Last edited by surfar; 11-20-2020 at 04:58 AM.

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11-16-2020, 09:05 PM - 1 Like	#166
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,403	Fotodiox also makes a version of the same type of adapter. They work a lot like the F 1.7x rear converter (but without the need for the teleconverter since the flange focal distance is shorter.

11-16-2020, 10:28 PM - 1 Like	#167
surfar Pentaxian Join Date: Jan 2015 Location: mid nth coast,nsw Photos: Gallery Posts: 6,141	Originally posted by UncleVanya Fotodiox also makes a version of the same type of adapter. its a direct copy of TechartPro, you update the firmware on FotoDiox from the Techart website.

11-17-2020, 06:16 AM	#168
bdery Pentaxian Join Date: Mar 2008 Location: Quebec city, Canada Photos: Gallery Posts: 9,357	Originally posted by Mistral75 The Techart Pro Leica M – Sony E autofocus adapter is a bit different. It does not transcode Pentax autofocus protocols into Sony ones and vice versa. Used in conjunction with a Leica M mount lens or pretty much any SLR lens mounted with a lens mount --> M mount dumb adapter, it make the { lens (+ dumb adapter) + Techart adapter } assembly behave like an E mount autofocus lens. In particular, it includes its own helical and focus motor. Focus is done by increasing and decreasing the thickness of the Techart adapter. Techart PRO Leica M – Sony E Autofocus Adapter – TECHART Adapters Think of it as the glassless, motorised, M-E mount equivalent of the smc Pentax-F 1.7x AF Adapter. Thanks for the explanation. It's a bit convoluted, but it does make some sense (and as a user of that TC I understand what you mean clearly) .

11-19-2020, 09:01 PM	#169
ecostigny Pentaxian Join Date: Nov 2017 Location: Branford, CT Posts: 561	Wow, that is certainly a different approach to turning manual focus lenses into autofocus lenses.

11-19-2020, 09:29 PM - 1 Like	#170
mlt Site Supporter Join Date: Dec 2007 Posts: 1,159	Convoluted is one word. On a 61mp A7r iv, that means keeping 3 different mount surfaces (including one that moves) absolutely parallel to the sensor that also moves for shake reduction. What can go wrong.

11-19-2020, 10:54 PM	#171
Breakfastographer Pentaxian Join Date: Nov 2018 Posts: 673	Originally posted by mlt Convoluted is one word. On a 61mp A7r iv, that means keeping 3 different mount surfaces (including one that moves) absolutely parallel to the sensor that also moves for shake reduction. What can go wrong. Not sure what I'm missing here - it was my understanding the adapter controls focus using the mechanism inside the lens, rather than the adapter itself pumping to achieve focus. So where does the moving mount surface come in?

11-19-2020, 11:24 PM	#172
mlt Site Supporter Join Date: Dec 2007 Posts: 1,159	The Techart adapter has its own helical and focus motor as stated in Mistral’s post above

11-19-2020, 11:30 PM	#173
FotoPete Veteran Member Join Date: Feb 2007 Location: Toronto Photos: Gallery Posts: 1,774	Originally posted by Breakfastographer Not sure what I'm missing here - it was my understanding the adapter controls focus using the mechanism inside the lens, rather than the adapter itself pumping to achieve focus. So where does the moving mount surface come in? The Monster adapter (OP) will have an in-built motor to drive the lens' autofocus. The Techart method is the "adapter itself pumping" to achieve focus, mainly for Leica M as it is manual focus from the start and using other lens mounts is to just piggy-back on that method.

11-20-2020, 01:37 AM	#175
Fogel70 Pentaxian Join Date: Sep 2009 Location: Stockholm, Sweden Photos: Albums Posts: 3,062	Originally posted by surfar Advice from the manufacturer is to limit the weight of the attached lens,from memory 700gs(?). Some people push the limits though and here is the biggest lens Ive seen on the techart. In this case it should be the weight of camera that is critical, as the lens is attached to a tripod. With the camera moving during AF.

11-20-2020, 03:05 AM	#176
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by Fogel70 In this case it should be the weight of camera that is critical, as the lens is attached to a tripod. With the camera moving during AF. Kind of a stretched version of the Contax AX concept.

11-20-2020, 04:24 AM	#178
Benz3ne Pentaxian Join Date: Jun 2019 Location: Cymru Posts: 2,356	Originally posted by surfar Its a $ony,they dont weigh much! Aside from the first FF lot which were remarkably light, the newer ones are right on the brink at around 650g including battery and SD card. Add a grip and/or flash/etc. and you might tip the 700g balance they specify. Unless you're considering the APS-C offerings, which are undoubtedly slim.

11-20-2020, 06:50 AM	#180
someasiancameraguy Veteran Member Join Date: Jul 2017 Location: Hong Kong Posts: 419	Originally posted by Benz3ne Aside from the first FF lot which were remarkably light, the newer ones are right on the brink at around 650g including battery and SD card. Add a grip and/or flash/etc. and you might tip the 700g balance they specify. Unless you're considering the APS-C offerings, which are undoubtedly slim. At that point if you grip the body really hard even if the lens is mounted on a tripod you'll probably cause the AF motor to stall.