Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-11-2016, 10:21 AM   #1
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 4,739
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.

02-11-2016, 10:33 AM   #2
Pentaxian
bertwert's Avatar

Join Date: Jun 2015
Location: Golden, BC
Posts: 14,376
My first comment on the Petapixel post:
QuoteOriginally 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
Loyal Site Supporter
Loyal Site Supporter
WPRESTO's Avatar

Join Date: Aug 2010
Location: Massachusetts
Photos: Gallery | Albums
Posts: 48,878
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
Emperor and Senpai
Loyal Site Supporter
VoiceOfReason's Avatar

Join Date: Jun 2010
Location: Mishawaka IN area
Photos: Albums
Posts: 6,103
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
QuoteOriginally posted by DeadJohn Quote
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
Pentaxian
Mistral75's Avatar

Join Date: Feb 2009
Location: Paris, France
Posts: 6,537
QuoteOriginally posted by VoiceOfReason Quote
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
Veteran Member
hinman's Avatar

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
QuoteOriginally posted by hinman Quote
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
QuoteOriginally posted by nah Quote
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
QuoteOriginally posted by npc Quote
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!
04-10-2018, 12:21 AM   #12
Veteran Member
redcat's Avatar

Join Date: Jul 2014
Location: Paris
Photos: Gallery
Posts: 1,931
QuoteOriginally posted by hinman Quote
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
Veteran Member
hinman's Avatar

Join Date: Oct 2006
Location: Fremont, CA
Photos: Albums
Posts: 3,473
QuoteOriginally posted by nah Quote
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
Veteran Member
redcat's Avatar

Join Date: Jul 2014
Location: Paris
Photos: Gallery
Posts: 1,931
QuoteOriginally posted by hinman Quote
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
New Member




Join Date: Aug 2020
Posts: 1
QuoteOriginally posted by nah Quote
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 !
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
adapter, aperture, autofocus, leica, lens, sony
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sony A7II... mrNewt Non-Pentax Cameras: Canon, Nikon, etc. 107 09-17-2015 12:14 PM
Vote for the Sony A7II D1N0 Non-Pentax Cameras: Canon, Nikon, etc. 8 05-09-2015 09:30 PM
Sony testing 48MP sensor shift mode on the A7II? Clavius Non-Pentax Cameras: Canon, Nikon, etc. 7 04-11-2015 09:20 AM
New Sony A7II and A9 with IBIS Clavius Non-Pentax Cameras: Canon, Nikon, etc. 206 12-12-2014 05:37 PM
Sony A7ii -- what Pentax FF should look like? MJSfoto1956 Pentax DSLR Discussion 59 11-25-2014 03:09 PM



All times are GMT -7. The time now is 02:03 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top