Autofocus of DSLR Lenses on Pentax Film Bodies

G and T · 03-28-2014, 08:59 AM

Originally posted by UlrichSchiegg

Tamron Lens SP 28-75mm F/2.8 XR Di LD ASP Makro

Originally posted by DSims

But if the Tamron lacks an aperture ring

The Tamron definitely has an aperture ring and is also definitely full frame and mine works flawlessly on my MZS.
Glenn

DSims · 03-28-2014, 06:33 PM

Originally posted by G and T

The Tamron definitely has an aperture ring and is also definitely full frame and mine works flawlessly on my MZS.
Glenn

I'd always thought it had an aperture ring, but I took the OP's word for it.

UlrichSchiegg · 04-02-2014, 09:27 AM

Past week end I had the chance to test the 18-135 with the DC motor on the Z-1 body. It does not autofocus. The Av/Tv setting worked fine. Also the Sigma 35 1.4 with HSM motor was tried on a Z-1 by another forum member. He reported that it also does not autofocus.

stevebrot · 04-02-2014, 02:04 PM

Originally posted by UlrichSchiegg

Past week end I had the chance to test the 18-135 with the DC motor on the Z-1 body. It does not autofocus. The Av/Tv setting worked fine. Also the Sigma 35 1.4 with HSM motor was tried on a Z-1 by another forum member. He reported that it also does not autofocus.

Makes sense. All of the Pentax film AF cameras are mechanical (screw drive) only.

Steve

Vranx · 04-04-2014, 01:56 PM

Originally posted by G and T

The Tamron definitely has an aperture ring and is also definitely full frame and mine works flawlessly on my MZS.
Glenn

The Tamron Di 28-75 has an aperture ring, I used it succesfully on Pentax AF and MF film cameras.

The only thing with manual focus: it can be focussed a little bit beyond infinity (like many modern aspherical IF lenses do for technical reasons), so be careful when focussing! But it is a very good lens on film bodies!

G and T · 04-04-2014, 06:53 PM

The reason that there is confusion whether the Tamron 28-75mm has an aperture ring or not, is that in some other mounts it hasn't but the K mount version has.
Glenn

DSims · 04-04-2014, 08:35 PM

Originally posted by G and T

The reason that there is confusion whether the Tamron 28-75mm has an aperture ring or not, is that in some other mounts it hasn't but the K mount version has.
Glenn

Thanks for the clarification - I was wondering ever since I repeated the OPs assertion that it didn't have one, but then others assured us it did. I see how easy it is to make this mistake if you don't own one, because often the wrong mount is pictured online.

johnha · 04-09-2014, 02:00 PM

Originally posted by stevebrot

Makes sense. All of the Pentax film AF cameras are mechanical (screw drive) only.

Steve

Worth pointing out though that Pentax hopefully considered K-AF2/3 mount lenses might be used on AF film SLRs with the PZ contacts and designed it so it would be a safe combination. Some independent lens manufacturers might not have been so diligent.

UlrichSchiegg · 04-28-2014, 10:18 AM

After the discussion on the thread, I decided on the

Tamron Lens SP 28-75mm F/2.8 XR Di LD ASP Makro

lens, since none of the lenses I tried which have an internal lens motor (be it HSM, DC, SDM) did work. I can confirm, that the new Tamron I received has an aperture ring on the Pentax version and that all the Z-1 functions including Autofocus work fine.

DSims · 04-28-2014, 01:25 PM

Originally posted by UlrichSchiegg

After the discussion on the thread, I decided on the

Tamron Lens SP 28-75mm F/2.8 XR Di LD ASP Makro

lens, since none of the lenses I tried which have an internal lens motor (be it HSM, DC, SDM) did work. I can confirm, that the new Tamron I received has an aperture ring on the Pentax version and that all the Z-1 functions including Autofocus work fine.

Thanks for the update!

04-28-2014, 10:18 AM	#24
UlrichSchiegg Senior Member Join Date: Apr 2013 Photos: Gallery Posts: 298 Original Poster	Autofocus on Tamron (with Aperture Ring) works fine After the discussion on the thread, I decided on the Tamron Lens SP 28-75mm F/2.8 XR Di LD ASP Makro lens, since none of the lenses I tried which have an internal lens motor (be it HSM, DC, SDM) did work. I can confirm, that the new Tamron I received has an aperture ring on the Pentax version and that all the Z-1 functions including Autofocus work fine.

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03-28-2014, 08:59 AM	#16
G and T Veteran Member Join Date: Aug 2011 Location: Langwarrin Australia Photos: Gallery Posts: 382	Originally posted by UlrichSchiegg Tamron Lens SP 28-75mm F/2.8 XR Di LD ASP Makro Originally posted by DSims But if the Tamron lacks an aperture ring The Tamron definitely has an aperture ring and is also definitely full frame and mine works flawlessly on my MZS. Glenn

03-28-2014, 06:33 PM	#17
DSims Veteran Member Join Date: Sep 2009 Location: Southern California Photos: Gallery \| Albums Posts: 3,236	Originally posted by G and T The Tamron definitely has an aperture ring and is also definitely full frame and mine works flawlessly on my MZS. Glenn I'd always thought it had an aperture ring, but I took the OP's word for it.

04-02-2014, 09:27 AM	#18
UlrichSchiegg Senior Member Join Date: Apr 2013 Photos: Gallery Posts: 298 Original Poster	Past week end I had the chance to test the 18-135 with the DC motor on the Z-1 body. It does not autofocus. The Av/Tv setting worked fine. Also the Sigma 35 1.4 with HSM motor was tried on a Z-1 by another forum member. He reported that it also does not autofocus.

04-02-2014, 02:04 PM	#19
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by UlrichSchiegg Past week end I had the chance to test the 18-135 with the DC motor on the Z-1 body. It does not autofocus. The Av/Tv setting worked fine. Also the Sigma 35 1.4 with HSM motor was tried on a Z-1 by another forum member. He reported that it also does not autofocus. Makes sense. All of the Pentax film AF cameras are mechanical (screw drive) only. Steve

04-04-2014, 01:56 PM	#20
Vranx Senior Member Join Date: Sep 2009 Location: Beautiful Bavaria :-) Posts: 123	Originally posted by G and T The Tamron definitely has an aperture ring and is also definitely full frame and mine works flawlessly on my MZS. Glenn The Tamron Di 28-75 has an aperture ring, I used it succesfully on Pentax AF and MF film cameras. The only thing with manual focus: it can be focussed a little bit beyond infinity (like many modern aspherical IF lenses do for technical reasons), so be careful when focussing! But it is a very good lens on film bodies!

04-04-2014, 06:53 PM	#21
G and T Veteran Member Join Date: Aug 2011 Location: Langwarrin Australia Photos: Gallery Posts: 382	The reason that there is confusion whether the Tamron 28-75mm has an aperture ring or not, is that in some other mounts it hasn't but the K mount version has. Glenn

04-04-2014, 08:35 PM	#22
DSims Veteran Member Join Date: Sep 2009 Location: Southern California Photos: Gallery \| Albums Posts: 3,236	Originally posted by G and T The reason that there is confusion whether the Tamron 28-75mm has an aperture ring or not, is that in some other mounts it hasn't but the K mount version has. Glenn Thanks for the clarification - I was wondering ever since I repeated the OPs assertion that it didn't have one, but then others assured us it did. I see how easy it is to make this mistake if you don't own one, because often the wrong mount is pictured online.

04-09-2014, 02:00 PM	#23
johnha Veteran Member Join Date: Apr 2012 Location: Lancashire, UK Photos: Albums Posts: 1,155	Originally posted by stevebrot Makes sense. All of the Pentax film AF cameras are mechanical (screw drive) only. Steve Worth pointing out though that Pentax hopefully considered K-AF2/3 mount lenses might be used on AF film SLRs with the PZ contacts and designed it so it would be a safe combination. Some independent lens manufacturers might not have been so diligent.

04-28-2014, 01:25 PM	#25
DSims Veteran Member Join Date: Sep 2009 Location: Southern California Photos: Gallery \| Albums Posts: 3,236	Originally posted by UlrichSchiegg After the discussion on the thread, I decided on the Tamron Lens SP 28-75mm F/2.8 XR Di LD ASP Makro lens, since none of the lenses I tried which have an internal lens motor (be it HSM, DC, SDM) did work. I can confirm, that the new Tamron I received has an aperture ring on the Pentax version and that all the Z-1 functions including Autofocus work fine. Thanks for the update!

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