Adapter for Pentax lenses on Sony Alpha 7

Photodana · 03-10-2015, 02:00 AM

I've read, that a Sony Alpha 7 full frame camera can utilize (old) Pentax film camera lenses, of which I own quite a few.
I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses.
I don't really want two camera systems :-)

Last edited by Photodana; 03-10-2015 at 02:01 AM. Reason: Spelling errors

**clackers** · 03-10-2015, 02:14 AM

Originally posted by Photodana

I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses.

No. :-)

Adam · 03-10-2015, 02:45 AM

Originally posted by Photodana

I've read, that a Sony Alpha 7 full frame camera can utilize (old) Pentax film camera lenses, of which I own quite a few.
I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses.
I don't really want two camera systems :-)

All manual. See:
Sony A7 with Pentax Full-frame Glass Review - Introduction | PentaxForums.com Reviews

grispie · 03-10-2015, 02:48 AM - **1 Like**

Originally posted by Photodana

I don't really want two camera systems :-)

the pentax FF is close. Is there is no specific reason you'd want the A7 or you'd need FF now, i'd just wait & see what comes up.

Photodana · 03-10-2015, 07:36 AM

Originally posted by Adam

All manual. See:
Sony A7 with Pentax Full-frame Glass Review - Introduction | PentaxForums.com Reviews

Thanks
I do have an adapter for my Nex-6. It Works, but not well - only Manual Focus and old fashioned stoped Down metering - like the time before the Spotmatic F.
Don't want to go there Again :-) How hard can it be to make a decent up 2 date adapter...

Regards
Jens

---------- Post added 03-10-2015 at 03:39 PM ----------

Originally posted by grispie

the pentax FF is close. Is there is no specific reason you'd want the A7 or you'd need FF now, i'd just wait & see what comes up.

Thanks - I didn't know if the Full Frame talk was a joke or not. Was it actually on display at the CP+2015, as foreseen?
I hope it will be priced below 3000 Euros, though :-)
Regards
Jens

grispie · 03-10-2015, 07:47 AM

Originally posted by Photodana

Thanks - I didn't know if the Full Frame talk was a joke or not. Was it actually on display at the CP+2015, as foreseen?
I hope it will be priced below 3000 Euros, though :-)

yes, you've missed something obviously :-) I'd be surprised if it went above 3k.

Tom S. · 03-10-2015, 10:52 AM

Moved to proper area.

yusuf · 03-16-2015, 09:41 AM

Originally posted by Photodana

I've read, that a Sony Alpha 7 full frame camera can utilize (old) Pentax film camera lenses, of which I own quite a few.
I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses.
I don't really want two camera systems :-)

AF adapters are available only for Nikon/Canon/Sony-A lenses. I wish there was one for Pentax too.

**clackers** · 03-16-2015, 12:35 PM

Originally posted by yusuf

AF adapters are available only for Nikon/Canon/Sony-A lenses. I wish there was one for Pentax too.

No AF adapter for Nikon, Yusuf.. :-(

I've heard the Canon adapter isn't great.

The Sony A mount one uses an elderly AF system far inferior to the ones in use today. The AF points are only in the centre and you lose 30% of your light (half a stop) to the thing's translucent splitting device.

yusuf · 03-16-2015, 08:52 PM

Originally posted by clackers

No AF adapter for Nikon, Yusuf.. :-(

I've heard the Canon adapter isn't great.

The Sony A mount one uses an elderly AF system far inferior to the ones in use today. The AF points are only in the centre and you lose 30% of your light (half a stop) to the thing's translucent splitting device.

my bad, I thought metabone was planning to release one but you are right, nothing so far.

I personally use LA-EA2 with NEX6 and it's pretty good actually.

**clackers** · 03-16-2015, 09:30 PM

Originally posted by yusuf

my bad, I thought metabone was planning to release one but you are right, nothing so far.

I personally use LA-EA2 with NEX6 and it's pretty good actually.

Well, you might not be bothered by your f2 lens becoming f2.2 or f2.4, Yusuf, or your f8 becoming f9 or f9.5.

But the AF is ancient - just 15 sensors, only three cross-type, and they cover only 20% of your NEX6's cropped frame.

On a full frame A7, that's just 10%.

It makes tracking difficult - no match for a Nikon D4, say, with 51 sensors, or Canon 1D X with 61.

yusuf · 03-17-2015, 02:43 AM

Originally posted by clackers

Well, you might not be bothered by your f2 lens becoming f2.2 or f2.4, Yusuf, or your f8 becoming f9 or f9.5.

But the AF is ancient - just 15 sensors, only three cross-type, and they cover only 20% of your NEX6's cropped frame.

On a full frame A7, that's just 10%.

It makes tracking difficult - no match for a Nikon D4, say, with 51 sensors, or Canon 1D X with 61.

f2 remains f2, a bit of light loss is agreed though and I am not worried to trade it for AF.

I don't think OP even asked for the comparison with top of the line AF machines. And to be honest, do we expect D4 or 1DX performance from even Pentax k3 or Sony native mount lenses? We need to keep the expectation realistic when using adapters. And someone wants the best in class AF, Nikon or Canon is the choice.

btw, as a long time user of k5, I do see LA-EA2 performs as good as K-5 if not better.

**clackers** · 03-17-2015, 03:17 AM

Originally posted by yusuf

btw, as a long time user of k5, I do see LA-EA2 performs as good as K-5 if not better.

Both the K-5 and the LA-EA2 are dated, Yusuf.

Sadly, the expensive LA-EA4 seems to be just the LA-EA2 for full frame. The same old technology.

I would not expect it to improve, either.

The A-mount seems likely to be euthanized.

osv · 03-18-2015, 02:56 PM

Originally posted by yusuf

f2 remains f2, a bit of light loss is agreed though and I am not worried to trade it for AF.

you lose maybe 1/3rd stop, and you gain live view in an evf, instead of having to use a horrible ovf... more than worth it, by a long shot.

you also get access to eleven ff f/2.8 zooms in a-mount, vs. two ff f/2.8 zooms in k-mount

the new tamron sp 15-30mm f/2.8 zoom is coming out in a-mount, and it is being compared favorably to the nikon 14-24... can't get that lens in k-mount.
Tamron SP 15-30mm f/2.8 Di USD Lens (Sony A) AFA012S-700 B&H

laea4 is a winner, no question about it.

yusuf · 03-19-2015, 10:28 AM

Originally posted by osv

...
laea4 is a winner, no question about it.

Agree, I don't own EA4 but I do have EA2 and both has same AF speed. I wish there was a way to modify EA2 for FF.

03-10-2015, 02:00 AM	#1
Photodana Senior Member Join Date: Feb 2008 Location: Greater Copenhagen Photos: Gallery \| Albums Posts: 161	Adapter for Pentax lenses on Sony Alpha 7 I've read, that a Sony Alpha 7 full frame camera can utilize (old) Pentax film camera lenses, of which I own quite a few. I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses. I don't really want two camera systems :-) Last edited by Photodana; 03-10-2015 at 02:01 AM. Reason: Spelling errors

03-10-2015, 02:45 AM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by Photodana I've read, that a Sony Alpha 7 full frame camera can utilize (old) Pentax film camera lenses, of which I own quite a few. I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses. I don't really want two camera systems :-) All manual. See: Sony A7 with Pentax Full-frame Glass Review - Introduction \| PentaxForums.com Reviews Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-16-2015, 12:35 PM	#9
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by yusuf AF adapters are available only for Nikon/Canon/Sony-A lenses. I wish there was one for Pentax too. No AF adapter for Nikon, Yusuf.. :-( I've heard the Canon adapter isn't great. The Sony A mount one uses an elderly AF system far inferior to the ones in use today. The AF points are only in the centre and you lose 30% of your light (half a stop) to the thing's translucent splitting device. Last edited by clackers; 03-16-2015 at 12:52 PM.

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03-10-2015, 02:14 AM	#2
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Photodana I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses. No. :-)

03-10-2015, 02:48 AM - 1 Like	#4
grispie Veteran Member Join Date: Feb 2013 Posts: 1,199	Originally posted by Photodana I don't really want two camera systems :-) the pentax FF is close. Is there is no specific reason you'd want the A7 or you'd need FF now, i'd just wait & see what comes up.

03-10-2015, 07:36 AM	#5
Photodana Senior Member Join Date: Feb 2008 Location: Greater Copenhagen Photos: Gallery \| Albums Posts: 161 Original Poster	Originally posted by Adam All manual. See: Sony A7 with Pentax Full-frame Glass Review - Introduction \| PentaxForums.com Reviews Thanks I do have an adapter for my Nex-6. It Works, but not well - only Manual Focus and old fashioned stoped Down metering - like the time before the Spotmatic F. Don't want to go there Again :-) How hard can it be to make a decent up 2 date adapter... Regards Jens ---------- Post added 03-10-2015 at 03:39 PM ---------- Originally posted by grispie the pentax FF is close. Is there is no specific reason you'd want the A7 or you'd need FF now, i'd just wait & see what comes up. Thanks - I didn't know if the Full Frame talk was a joke or not. Was it actually on display at the CP+2015, as foreseen? I hope it will be priced below 3000 Euros, though :-) Regards Jens

03-10-2015, 07:47 AM	#6
grispie Veteran Member Join Date: Feb 2013 Posts: 1,199	Originally posted by Photodana Thanks - I didn't know if the Full Frame talk was a joke or not. Was it actually on display at the CP+2015, as foreseen? I hope it will be priced below 3000 Euros, though :-) yes, you've missed something obviously :-) I'd be surprised if it went above 3k.

03-10-2015, 10:52 AM	#7
Tom S. Veteran Member Join Date: May 2008 Location: S.E. Michigan Photos: Albums Posts: 4,317	Moved to proper area.

03-16-2015, 09:41 AM	#8
yusuf Pentaxian Join Date: Nov 2008 Location: Palo Alto, CA Photos: Gallery Posts: 2,497	Originally posted by Photodana I've read, that a Sony Alpha 7 full frame camera can utilize (old) Pentax film camera lenses, of which I own quite a few. I'm interested in knowing if there's an adapter that will enable AF, and auto aperture etc. if I buy a Sony Alpha 7 full frame, an want to use my Pentax lenses. I don't really want two camera systems :-) AF adapters are available only for Nikon/Canon/Sony-A lenses. I wish there was one for Pentax too.

03-16-2015, 08:52 PM	#10
yusuf Pentaxian Join Date: Nov 2008 Location: Palo Alto, CA Photos: Gallery Posts: 2,497	Originally posted by clackers No AF adapter for Nikon, Yusuf.. :-( I've heard the Canon adapter isn't great. The Sony A mount one uses an elderly AF system far inferior to the ones in use today. The AF points are only in the centre and you lose 30% of your light (half a stop) to the thing's translucent splitting device. my bad, I thought metabone was planning to release one but you are right, nothing so far. I personally use LA-EA2 with NEX6 and it's pretty good actually.

03-16-2015, 09:30 PM	#11
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by yusuf my bad, I thought metabone was planning to release one but you are right, nothing so far. I personally use LA-EA2 with NEX6 and it's pretty good actually. Well, you might not be bothered by your f2 lens becoming f2.2 or f2.4, Yusuf, or your f8 becoming f9 or f9.5. But the AF is ancient - just 15 sensors, only three cross-type, and they cover only 20% of your NEX6's cropped frame. On a full frame A7, that's just 10%. It makes tracking difficult - no match for a Nikon D4, say, with 51 sensors, or Canon 1D X with 61.

03-17-2015, 02:43 AM	#12
yusuf Pentaxian Join Date: Nov 2008 Location: Palo Alto, CA Photos: Gallery Posts: 2,497	Originally posted by clackers Well, you might not be bothered by your f2 lens becoming f2.2 or f2.4, Yusuf, or your f8 becoming f9 or f9.5. But the AF is ancient - just 15 sensors, only three cross-type, and they cover only 20% of your NEX6's cropped frame. On a full frame A7, that's just 10%. It makes tracking difficult - no match for a Nikon D4, say, with 51 sensors, or Canon 1D X with 61. f2 remains f2, a bit of light loss is agreed though and I am not worried to trade it for AF. I don't think OP even asked for the comparison with top of the line AF machines. And to be honest, do we expect D4 or 1DX performance from even Pentax k3 or Sony native mount lenses? We need to keep the expectation realistic when using adapters. And someone wants the best in class AF, Nikon or Canon is the choice. btw, as a long time user of k5, I do see LA-EA2 performs as good as K-5 if not better.

03-17-2015, 03:17 AM	#13
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by yusuf btw, as a long time user of k5, I do see LA-EA2 performs as good as K-5 if not better. Both the K-5 and the LA-EA2 are dated, Yusuf. Sadly, the expensive LA-EA4 seems to be just the LA-EA2 for full frame. The same old technology. I would not expect it to improve, either. The A-mount seems likely to be euthanized.

03-18-2015, 02:56 PM	#14
osv Veteran Member Join Date: Mar 2007 Location: So Cal Photos: Gallery Posts: 2,080	Originally posted by yusuf f2 remains f2, a bit of light loss is agreed though and I am not worried to trade it for AF. you lose maybe 1/3rd stop, and you gain live view in an evf, instead of having to use a horrible ovf... more than worth it, by a long shot. you also get access to eleven ff f/2.8 zooms in a-mount, vs. two ff f/2.8 zooms in k-mount the new tamron sp 15-30mm f/2.8 zoom is coming out in a-mount, and it is being compared favorably to the nikon 14-24... can't get that lens in k-mount. Tamron SP 15-30mm f/2.8 Di USD Lens (Sony A) AFA012S-700 B&H laea4 is a winner, no question about it.

03-19-2015, 10:28 AM	#15
yusuf Pentaxian Join Date: Nov 2008 Location: Palo Alto, CA Photos: Gallery Posts: 2,497	Originally posted by osv ... laea4 is a winner, no question about it. Agree, I don't own EA4 but I do have EA2 and both has same AF speed. I wish there was a way to modify EA2 for FF.