Autofocus any (incl. manual) PK lens with Sony A7II

DeadJohn · 02-11-2016, 10:21 AM

Here's an interesting lens adapter. It takes advantage of the short backfocus of the E mount. The lens stays focused at infinity while the adapter length varies to achieve focus. Techart PRO Leica M – Sony E Autofocus Adapter | TECHART PRO

$549 total for the (Sony E mount -> Leica M) plus (Leica M -> Pentax K).

FAQ says the aperture can only be controlled with an aperture ring.

bertwert · 02-11-2016, 10:33 AM

My first comment on the Petapixel post:

Originally posted by bertwert:

Not the world's first... though this one isn't a TC.
SMC Pentax-F 1.7x AF Adapter

Techart Unveils the World's First Autofocus Adapter for Manual Focus Lenses

**WPRESTO** · 02-11-2016, 10:42 AM

A fascinating device but with obvious limitations. With only 4.5mm of movement it is primarily useful for normal and WA lenses, less so for telephotos. For the latter, if you coarse focus manually, it would be OK for the last tweak to achieve sharpness.

VoiceOfReason · 02-11-2016, 11:08 AM

I have the first AF adapter. It is the Pentax 1.7 AFA.

npc · 02-11-2016, 01:42 PM

Originally posted by DeadJohn

Here's an interesting lens adapter. It takes advantage of the short backfocus of the E mount. The lens stays focused at infinity while the adapter length varies to achieve focus. Techart PRO Leica M – Sony E Autofocus Adapter | TECHART PRO

$549 total for the (Sony E mount -> Leica M) plus (Leica M -> Pentax K).

FAQ says the aperture can only be controlled with an aperture ring.

$200 for a dumb K->M adapter? There are decent ones out there for less than $30

Mistral75 · 02-11-2016, 01:54 PM

Originally posted by VoiceOfReason

I have the first AF adapter. It is the Pentax 1.7 AFA.

Do you think that the smc Pentax-F 1.7x AF Adapter is older than the Nikon TC1.6 A? I am not so sure.

osv · 02-11-2016, 01:59 PM

it's not a dumb adapter, it's a glassless autofocus adapter, that has it's own motor, no screw drive joint like the pentax adapter has.

the af functionality is provided by the motor moving the lens in and out from the sensor.

the techart adapters don't have an especially good rep for af accuracy, so this will need to be evaluated.

hinman · 06-13-2017, 10:45 AM

I now have this adapter and all of my FA limited are going well with AF in Sony A7RMII. I am surprised that this adapter actually strong enough to AF my Tamron 17-35mm f/2.8-4.0 and Tamron 28-75mm f/2.8 that are in Pentax K-mount. Will show more and update as I go through the paces with my new adapter and newly arrived camera.

Cheers,
Hin

nah · 04-08-2018, 10:12 PM

Originally posted by hinman

I now have this adapter and all of my FA limited are going well with AF in Sony A7RMII. I am surprised that this adapter actually strong enough to AF my Tamron 17-35mm f/2.8-4.0 and Tamron 28-75mm f/2.8 that are in Pentax K-mount. Will show more and update as I go through the paces with my new adapter and newly arrived camera.

Cheers,
Hin

Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use?

npc · 04-09-2018, 11:28 AM

Originally posted by nah

Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use?

Mine is still fine and focuses reliably. I have it since it came out but I only use it from time to time (on a7rii) but I've seen people complain on other forums that theirs developed a mechanical problem after several months of heavy use and some other problems like it drains the battery for some if left on the camera, etc.
I'd suggest to check the lengthy thread about this adapter on fredmiranda before investing into one.

nah · 04-09-2018, 11:56 PM

Originally posted by npc

Mine is still fine and focuses reliably. I have it since it came out but I only use it from time to time (on a7rii) but I've seen people complain on other forums that theirs developed a mechanical problem after several months of heavy use and some other problems like it drains the battery for some if left on the camera, etc.
I'd suggest to check the lengthy thread about this adapter on fredmiranda before investing into one.

Thanks npc!

redcat · 04-10-2018, 12:21 AM

Originally posted by hinman

I now have this adapter and all of my FA limited are going well with AF in Sony A7RMII. I am surprised that this adapter actually strong enough to AF my Tamron 17-35mm f/2.8-4.0 and Tamron 28-75mm f/2.8 that are in Pentax K-mount. Will show more and update as I go through the paces with my new adapter and newly arrived camera.

very interesting info, so with this adapter your FA limited still have the original focal length and aperture and full frame compatible ?

hinman · 04-23-2018, 07:49 PM

Originally posted by nah

Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use?

I have not been visiting often and hence the very late reply. The adapter works well on A7r2. The newer version of bodies such as Sony A7r3, A73, A6300, A6500 will work even better because of improved AF speed and more advancement in PDAF.

On my Sony A7r2, the adapted Pentax lenses won't AF as fast as the native lenses but I will say comparable to AF in average lighting of my Pentax K-5. In the very dark indoor and when contrast is low, the AF has some hunting. The TechArtPro adapter has many kirks but most can be worked out with frequent usage, patience and understanding of its short-comings. The beauty of this adapter is that it turn all of my Pentax FA, M42, Pentax K-mount manual focus lenses into AF. It is like the Pentax AFA 1.7x TC adapter but it works way faster and more dependable than the AF in AFA adapter.

20171125-DSC00996
by Hin Man, on Flickr
TechArtPro + Pentax K to M adapter + Pentax FA 31mm f/1.8

20171215-DSC01016
by Hin Man, on Flickr

20171125-DSC01005
by Hin Man, on Flickr

20171125-DSC01008
by Hin Man, on Flickr

And for similar adapted lens with Pentax FA 77mm f/1.8

20180328-DSC01143
by Hin Man, on Flickr

Moring Ride with VTA 120
by Hin Man, on Flickr

More to share if you have interest to see more

Cheers,
Hin

redcat · 04-23-2018, 09:23 PM

Originally posted by hinman

On my Sony A7r2, the adapted Pentax lenses won't AF as fast as the native lenses but I will say comparable to AF in average lighting of my Pentax K-5. In the very dark indoor and when contrast is low, the AF has some hunting. The TechArtPro adapter has many kirks but most can be worked out with frequent usage, patience and understanding of its short-comings. The beauty of this adapter is that it turn all of my Pentax FA, M42, Pentax K-mount manual focus lenses into AF. It is like the Pentax AFA 1.7x TC adapter but it works way faster and more dependable than the AF in AFA adapter.

Thanks a lot for your review, great info and nice pics !

RamRa · 08-28-2020, 10:49 PM - **1 Like**

Originally posted by nah

Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use?

Used for 2,5 years, even with samy 135 2 (too heavy ?), no wobbles, still lkie new, love it !

02-11-2016, 10:21 AM	#1
DeadJohn Pentaxian Join Date: Jan 2011 Location: New York Posts: 4,833	Autofocus any (incl. manual) PK lens with Sony A7II Here's an interesting lens adapter. It takes advantage of the short backfocus of the E mount. The lens stays focused at infinity while the adapter length varies to achieve focus. Techart PRO Leica M – Sony E Autofocus Adapter \| TECHART PRO $549 total for the (Sony E mount -> Leica M) plus (Leica M -> Pentax K). FAQ says the aperture can only be controlled with an aperture ring.

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02-11-2016, 10:33 AM	#2
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,173	My first comment on the Petapixel post: Originally posted by bertwert: Not the world's first... though this one isn't a TC. SMC Pentax-F 1.7x AF Adapter Techart Unveils the World's First Autofocus Adapter for Manual Focus Lenses

02-11-2016, 10:42 AM	#3
WPRESTO Loyal Site Supporter Join Date: Aug 2010 Location: Massachusetts Photos: Gallery \| Albums Posts: 59,104	A fascinating device but with obvious limitations. With only 4.5mm of movement it is primarily useful for normal and WA lenses, less so for telephotos. For the latter, if you coarse focus manually, it would be OK for the last tweak to achieve sharpness.

02-11-2016, 11:08 AM	#4
VoiceOfReason Site Supporter Join Date: Jun 2010 Location: Mishawaka IN area Photos: Albums Posts: 6,124	I have the first AF adapter. It is the Pentax 1.7 AFA.

02-11-2016, 01:42 PM	#5
npc Veteran Member Join Date: Apr 2013 Posts: 313	Originally posted by DeadJohn Here's an interesting lens adapter. It takes advantage of the short backfocus of the E mount. The lens stays focused at infinity while the adapter length varies to achieve focus. Techart PRO Leica M – Sony E Autofocus Adapter \| TECHART PRO $549 total for the (Sony E mount -> Leica M) plus (Leica M -> Pentax K). FAQ says the aperture can only be controlled with an aperture ring. $200 for a dumb K->M adapter? There are decent ones out there for less than $30

02-11-2016, 01:54 PM	#6
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by VoiceOfReason I have the first AF adapter. It is the Pentax 1.7 AFA. Do you think that the smc Pentax-F 1.7x AF Adapter is older than the Nikon TC1.6 A? I am not so sure.

02-11-2016, 01:59 PM	#7
osv Veteran Member Join Date: Mar 2007 Location: So Cal Photos: Gallery Posts: 2,080	it's not a dumb adapter, it's a glassless autofocus adapter, that has it's own motor, no screw drive joint like the pentax adapter has. the af functionality is provided by the motor moving the lens in and out from the sensor. the techart adapters don't have an especially good rep for af accuracy, so this will need to be evaluated.

06-13-2017, 10:45 AM	#8
hinman Veteran Member Join Date: Oct 2006 Location: Fremont, CA Photos: Albums Posts: 3,473	I now have this adapter and all of my FA limited are going well with AF in Sony A7RMII. I am surprised that this adapter actually strong enough to AF my Tamron 17-35mm f/2.8-4.0 and Tamron 28-75mm f/2.8 that are in Pentax K-mount. Will show more and update as I go through the paces with my new adapter and newly arrived camera. Cheers, Hin

04-08-2018, 10:12 PM	#9
nah Senior Member Join Date: May 2008 Location: New Westminster, Canada Photos: Gallery Posts: 282	Originally posted by hinman I now have this adapter and all of my FA limited are going well with AF in Sony A7RMII. I am surprised that this adapter actually strong enough to AF my Tamron 17-35mm f/2.8-4.0 and Tamron 28-75mm f/2.8 that are in Pentax K-mount. Will show more and update as I go through the paces with my new adapter and newly arrived camera. Cheers, Hin Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use?

04-09-2018, 11:28 AM	#10
npc Veteran Member Join Date: Apr 2013 Posts: 313	Originally posted by nah Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use? Mine is still fine and focuses reliably. I have it since it came out but I only use it from time to time (on a7rii) but I've seen people complain on other forums that theirs developed a mechanical problem after several months of heavy use and some other problems like it drains the battery for some if left on the camera, etc. I'd suggest to check the lengthy thread about this adapter on fredmiranda before investing into one.

04-09-2018, 11:56 PM	#11
nah Senior Member Join Date: May 2008 Location: New Westminster, Canada Photos: Gallery Posts: 282	Originally posted by npc Mine is still fine and focuses reliably. I have it since it came out but I only use it from time to time (on a7rii) but I've seen people complain on other forums that theirs developed a mechanical problem after several months of heavy use and some other problems like it drains the battery for some if left on the camera, etc. I'd suggest to check the lengthy thread about this adapter on fredmiranda before investing into one. Thanks npc!

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04-10-2018, 12:21 AM	#12
redcat Veteran Member Join Date: Jul 2014 Location: Paris Photos: Gallery Posts: 1,939	Originally posted by hinman I now have this adapter and all of my FA limited are going well with AF in Sony A7RMII. I am surprised that this adapter actually strong enough to AF my Tamron 17-35mm f/2.8-4.0 and Tamron 28-75mm f/2.8 that are in Pentax K-mount. Will show more and update as I go through the paces with my new adapter and newly arrived camera. very interesting info, so with this adapter your FA limited still have the original focal length and aperture and full frame compatible ?

04-23-2018, 07:49 PM	#13
hinman Veteran Member Join Date: Oct 2006 Location: Fremont, CA Photos: Albums Posts: 3,473	Originally posted by nah Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use? I have not been visiting often and hence the very late reply. The adapter works well on A7r2. The newer version of bodies such as Sony A7r3, A73, A6300, A6500 will work even better because of improved AF speed and more advancement in PDAF. On my Sony A7r2, the adapted Pentax lenses won't AF as fast as the native lenses but I will say comparable to AF in average lighting of my Pentax K-5. In the very dark indoor and when contrast is low, the AF has some hunting. The TechArtPro adapter has many kirks but most can be worked out with frequent usage, patience and understanding of its short-comings. The beauty of this adapter is that it turn all of my Pentax FA, M42, Pentax K-mount manual focus lenses into AF. It is like the Pentax AFA 1.7x TC adapter but it works way faster and more dependable than the AF in AFA adapter. 20171125-DSC00996 by Hin Man, on Flickr TechArtPro + Pentax K to M adapter + Pentax FA 31mm f/1.8 20171215-DSC01016 by Hin Man, on Flickr 20171125-DSC01005 by Hin Man, on Flickr 20171125-DSC01008 by Hin Man, on Flickr And for similar adapted lens with Pentax FA 77mm f/1.8 20180328-DSC01143 by Hin Man, on Flickr Moring Ride with VTA 120 by Hin Man, on Flickr More to share if you have interest to see more Cheers, Hin

04-23-2018, 09:23 PM	#14
redcat Veteran Member Join Date: Jul 2014 Location: Paris Photos: Gallery Posts: 1,939	Originally posted by hinman On my Sony A7r2, the adapted Pentax lenses won't AF as fast as the native lenses but I will say comparable to AF in average lighting of my Pentax K-5. In the very dark indoor and when contrast is low, the AF has some hunting. The TechArtPro adapter has many kirks but most can be worked out with frequent usage, patience and understanding of its short-comings. The beauty of this adapter is that it turn all of my Pentax FA, M42, Pentax K-mount manual focus lenses into AF. It is like the Pentax AFA 1.7x TC adapter but it works way faster and more dependable than the AF in AFA adapter. Thanks a lot for your review, great info and nice pics !

08-28-2020, 10:49 PM - 1 Like	#15
RamRa New Member Join Date: Aug 2020 Posts: 1	Originally posted by nah Any updates to the usability of this adapter? How has it held up in the last 7-8 months of use? Used for 2,5 years, even with samy 135 2 (too heavy ?), no wobbles, still lkie new, love it !