K Mount Adapters To Sony E with full functionality?

heinamj · 11-22-2018, 05:51 AM

I've been searching the threads to determine if an adapter exists allowing full functionality of a K Mount DA lens on the newer Sony Mirrorless bodies without adding more glass between the lens and the body?

Would a DA* 300mm f4 work fully or partially or not at all?

**ramseybuckeye** · 11-22-2018, 05:57 AM

I can't answer your question except with "i doubt it", It would be fantastic if that was possible and used the Sony Autofocus speed, but the focus motor in the 300 is the slow part.

**Mikesul** · 11-22-2018, 07:10 AM

There is no such adapter. It is possible to buy the Techart Pro AF Leica to e-mount adapter and then attach the pentax lens with a Leica adapter to the Techart. The Techart-Pro works somewhat like our old 1.7 adapter which adjusts focus with adapter movement. In both cases you have to be close to focus already for it to work. I did not think it worth the trouble.

Wasp · 11-22-2018, 07:10 AM

I also doubt that there is an adapter that connects the electronics in a Sony camera to that in a Pentax lens, i.e. give you aperture control and autofocus. There is such a thing for Canon EF lenses AFAIK but the market for Pentax support is just not there.

**boriscleto** · 11-22-2018, 08:14 AM

Originally posted by Wasp

There is such a thing for Canon EF lenses AFAIK but the market for Pentax support is just not there.

And for Sigma SA...But those mounts have been fully electronic since the 1980s...Pentax has 2 lenses with electromagnetic aperture...

**clickclick** · 11-22-2018, 08:26 AM

On a related note, you might find this thread of interest:

DA* 300mm and Sony FS5 at 240fps - PentaxForums.com

**BigMackCam** · 11-22-2018, 09:19 AM

Moved to Non-Pentax forum...

reh321 · 11-22-2018, 09:58 AM

Originally posted by heinamj

I've been searching the threads to determine if an adapter exists allowing full functionality of a K Mount DA lens on the newer Sony Mirrorless bodies without adding more glass between the lens and the body?

Would a DA* 300mm f4 work fully or partially or not at all?

There would be no reason to add glass - E-mount flange distance is less than K-mount flange distance - but someone would have to figure out translation between electronics, and since Pentax adopted in-lens motor so recently, it would probably need to provide an AF motor for earlier lenses.

stevebrot · 11-22-2018, 10:14 AM

Originally posted by heinamj

Would a DA* 300mm f4 work fully or partially or not at all?

There are several glassless adapters that provide an aperture ring (non-calibrated...no set stops) that should allow manual focus with stop-down metering. The DA* 300mm provides adequate image circle for both APS-C and 24x36mm FF, so that base is covered. Other DA-series lenses with smaller image circles would be suitable for cropped format on FF bodies or native APS-C. As noted above and readily apparent from a product search on various Web sites, there are no adapters that provide AF or aperture control by the body.

Steve

11-22-2018, 05:51 AM	#1
heinamj Veteran Member Join Date: Nov 2014 Photos: Gallery Posts: 366	K Mount Adapters To Sony E with full functionality? I've been searching the threads to determine if an adapter exists allowing full functionality of a K Mount DA lens on the newer Sony Mirrorless bodies without adding more glass between the lens and the body? Would a DA* 300mm f4 work fully or partially or not at all?

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11-22-2018, 05:57 AM	#2
ramseybuckeye Site Supporter Join Date: Apr 2009 Location: Hampstead, NC Photos: Gallery Posts: 17,291	I can't answer your question except with "i doubt it", It would be fantastic if that was possible and used the Sony Autofocus speed, but the focus motor in the 300 is the slow part.

11-22-2018, 07:10 AM	#3
Mikesul Loyal Site Supporter Join Date: Sep 2009 Location: Phoenix, AZ Posts: 7,594	There is no such adapter. It is possible to buy the Techart Pro AF Leica to e-mount adapter and then attach the pentax lens with a Leica adapter to the Techart. The Techart-Pro works somewhat like our old 1.7 adapter which adjusts focus with adapter movement. In both cases you have to be close to focus already for it to work. I did not think it worth the trouble.

11-22-2018, 07:10 AM	#4
Wasp Pentaxian Join Date: Mar 2017 Location: Pretoria Photos: Gallery Posts: 4,660	I also doubt that there is an adapter that connects the electronics in a Sony camera to that in a Pentax lens, i.e. give you aperture control and autofocus. There is such a thing for Canon EF lenses AFAIK but the market for Pentax support is just not there.

11-22-2018, 08:14 AM	#5
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	Originally posted by Wasp There is such a thing for Canon EF lenses AFAIK but the market for Pentax support is just not there. And for Sigma SA...But those mounts have been fully electronic since the 1980s...Pentax has 2 lenses with electromagnetic aperture...

11-22-2018, 08:26 AM	#6
clickclick Loyal Site Supporter Join Date: May 2016 Location: East Coast Posts: 2,903	On a related note, you might find this thread of interest: DA* 300mm and Sony FS5 at 240fps - PentaxForums.com

11-22-2018, 09:19 AM	#7
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,669	Moved to Non-Pentax forum...

11-22-2018, 09:58 AM	#8
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,177	Originally posted by heinamj I've been searching the threads to determine if an adapter exists allowing full functionality of a K Mount DA lens on the newer Sony Mirrorless bodies without adding more glass between the lens and the body? Would a DA* 300mm f4 work fully or partially or not at all? There would be no reason to add glass - E-mount flange distance is less than K-mount flange distance - but someone would have to figure out translation between electronics, and since Pentax adopted in-lens motor so recently, it would probably need to provide an AF motor for earlier lenses.

11-22-2018, 10:14 AM	#9
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by heinamj Would a DA* 300mm f4 work fully or partially or not at all? There are several glassless adapters that provide an aperture ring (non-calibrated...no set stops) that should allow manual focus with stop-down metering. The DA* 300mm provides adequate image circle for both APS-C and 24x36mm FF, so that base is covered. Other DA-series lenses with smaller image circles would be suitable for cropped format on FF bodies or native APS-C. As noted above and readily apparent from a product search on various Web sites, there are no adapters that provide AF or aperture control by the body. Steve

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