About my Tamron 28-200 lens

doc_taz_nj · 08-05-2019, 12:35 PM

I'm not sure which version I have, other than it's got a 72mm filter ring. It does have the A setting in the aperture ring. Note the reading from the RawTherapee screenshot. Samsung/Schneider... so this is a Kreuznach design? Does anyone know when this version was released?

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**aslyfox** · 08-05-2019, 12:39 PM

could it be one of these ?

https://www.pentaxforums.com/userreviews/tamron-af-28-200mm-f-3-8-5-6-xr-di-...-if-macro.html

UMC · 08-05-2019, 12:52 PM - **1 Like**

Originally posted by doc_taz_nj

I'm not sure which version I have ... Does anyone know when this version was released?

The lens is a pure Tamron design, my guess is that RawTherapee misinterpretes the lens ID. Your lens is a Tamron Model 71D (Tamron AF Aspherical 28-200mm 1:3.8-5.6), released in 1992, see: TAMRON All-in-One Zoom Lens

Addendum: Long time ago I posted a list of Tamron 28-200 versions for Pentax in this thread: https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/330279-sho...ml#post3779622

Addendum 2:

Originally posted by aslyfox

could it be one of these?
https://www.pentaxforums.com/userreviews/tamron-af-28-200mm-f-3-8-5-6-xr-di-...-if-macro.html

I regard it as a mistake in PFs lens review database to mix up all the versions. In the first link I posted Tamron describes how different these lenses are....

**aslyfox** · 08-05-2019, 01:14 PM - **1 Like**

Originally posted by UMC

. . . I regard it as a mistake in PFs lens review database to mix up all the versions. In the first link I posted Tamron describes how different these lenses are....

thanks for the correction

stevebrot · 08-05-2019, 01:31 PM - **1 Like**

Originally posted by doc_taz_nj

Note the reading from the RawTherapee screenshot. Samsung/Schneider... so this is a Kreuznach design?

Nope, it means that it returns a lens id code that RawTherapy interprets as belonging to the Samsung/Schneider D-XENON 50-200/4.0-5.6 lens*. Why that might be is anyone's guess. FWIW, the D-Xenon 50-200 is a relabeled Pentax DA 50-200 and not a Kreuznach design either.

Tamron made several versions of the 28-200/3.8-5.6. I bought a similar one for my daughter in 2007 and it is a decent performer, if a little bulky.

Steve

* It is not unusual for third-party lenses to return the same lens codes as lenses by other makers, though in this case, I suspect an error in the RawTherapee look-up table.

doc_taz_nj · 08-05-2019, 01:55 PM

Ah, thanks for the point about it being mislabeled. That did seem sketchy to me.

1992, wow! I scored my copy for $32 via a Japanese seller on eBay. I'm just glad it works with all four of my Pentax bodies. Not as good at close focus as my Tamron 18-200, but I'm fine with it running at the equivalent 42-300 range for the K-x and K-70.

kypfer · 08-05-2019, 02:47 PM - **1 Like**

I wonder how well related these "modern" fixed-mount lenses are to the Adaptall-2 originals. I had one of the #71A's when they were new (mid to late '80's, at a guess) and replaced it with a #171A when they became available. The first was a vari-focal design, in that the focus changed as the lens was zoomed, and it only had a minimum focus of about 6ft, as I remember. The later lens was (is) far more user-friendly, which stayed in focus as you zoomed and with a minimum focus of 3ft. The first had a rotating front element, so the lens hood was fairly minimal, but the later had a "petal" hood which was far more efficient. My example unfortunately developed haze/fungus deep in the internals and was retired only a couple of years ago

UMC · 08-05-2019, 11:31 PM

Originally posted by kypfer

I wonder how well related these "modern" fixed-mount lenses are to the Adaptall-2 originals. I had one of the #71A's when they were new (mid to late '80's, at a guess) and replaced it with a #171A when they became available. The first was a vari-focal design, in that the focus changed as the lens was zoomed, and it only had a minimum focus of about 6ft, as I remember. The later lens was (is) far more user-friendly, which stayed in focus as you zoomed and with a minimum focus of 3ft. The first had a rotating front element, so the lens hood was fairly minimal, but the later had a "petal" hood which was far more efficient. My example unfortunately developed haze/fungus deep in the internals and was retired only a couple of years ago

According to Tamron they started developing the 28-200 in the late 80ies and the first one to appear on the market was the 71x, which was - to the best of my knowledge - the only generation, that appeared as Adpatall-2 (71A) and fixed mount (71D).

Originally posted by kypfer

.... and replaced it with a #171A when they became available. ... with a minimum focus of 3ft. ....

That is exactly what Tamron mentions as the main advantage of the 171D in their history of 28-200s. BTW, the 171D is the technical basis of the smc Pentax-FA 1:3.8-5.6 28-200mm -IF&AL-. Actually they seem to be identical apart from the exterior "Pentax-look" and the SMC coating of course.
I once compared the optical performance of the 71D and the Pentax FA 28-200 (~Tamron 171D) and noticed a slight advantage of the Pentax. However, today on the K-1 it is simply not good enough to provide satisfactory results.

kypfer · 08-07-2019, 12:11 AM

Originally posted by UMC

According to Tamron they started developing the 28-200 in the late 80ies and the first one to appear on the market was the 71x, which was - to the best of my knowledge - the only generation, that appeared as Adpatall-2 (71A) and fixed mount (71D).

Not quite! The 171A was Adaptall-2 as well. I've still got my fungus-ridden example and approached Tamron UK about getting it cleaned a few years ago when it finally got too bad to use, but it was "a service they can no longer supply!". They were also "unable" to provide strip-down instructions, which was a bit of a *bleep*, but probably understandable!

UMC · 08-07-2019, 12:37 AM

Originally posted by kypfer

... The 171A was Adaptall-2 as well ....

Thank you very much for this information. The 171A seems to be a very rare beast. I've been collecting pictures of K-Mount lenses since 2012 and thus came across some 5000(!) different lenses and variants of lenses, but I've never seen the 171A. I would be more than happy if you could send me some pictures of the lens (either PM or post it in this thread).

kypfer · 08-07-2019, 04:06 AM - **1 Like**

Originally posted by UMC

Thank you very much for this information. The 171A seems to be a very rare beast. I've been collecting pictures of K-Mount lenses since 2012 and thus came across some 5000(!) different lenses and variants of lenses, but I've never seen the 171A. I would be more than happy if you could send me some pictures of the lens (either PM or post it in this thread).

Herewith the Tamron Adaptall-2 #171A 28-200mm lens attached to my K-70 (and photographed with my *ist DL2)
Hope this helps

UMC · 08-07-2019, 12:16 PM - **1 Like**

Now that we have hijacked this thread, I have to thank you for posting this picture. Surprisingly the 171A does not look like the 171D at all, but rather like the much later 371D.

doc_taz_nj · 08-07-2019, 02:00 PM

No worries about the hijacking. I'm learning a lot from you folks.

**boriscleto** · 08-07-2019, 03:20 PM

Originally posted by UMC

BTW, the 171D is the technical basis of the smc Pentax-FA 1:3.8-5.6 28-200mm -IF&AL-. .

The FA 28-200 is based on the 271D. Different optical formula...

171D 15 elements in 13 groups, 271D 16 elements in 14 groups.

UMC · 08-08-2019, 11:39 AM

Originally posted by boriscleto

The FA 28-200 is based on the 271D. Different optical formula...

171D 15 elements in 13 groups, 271D 16 elements in 14 groups.

I would like to challenge this: According to the Japanese Tamron site (171D and 271D) 171D and 271D are identical apart from the exterior appearance. They are both listed as 16 elements in 14 groups with a minimal focusing distance of 0.52 m. These are exactly the same specifications that Pentax lists in their 1998 edition of the "smc Pentax-FA interchangeable lenses" manual.

The later model 371D is also similar but has a slightly better focusing distance of 0.49m.

08-05-2019, 12:52 PM - 1 Like	#3
UMC Senior Member Join Date: Dec 2012 Location: Vienna Photos: Gallery Posts: 205	Originally posted by doc_taz_nj I'm not sure which version I have ... Does anyone know when this version was released? The lens is a pure Tamron design, my guess is that RawTherapee misinterpretes the lens ID. Your lens is a Tamron Model 71D (Tamron AF Aspherical 28-200mm 1:3.8-5.6), released in 1992, see: TAMRON All-in-One Zoom Lens Addendum: Long time ago I posted a list of Tamron 28-200 versions for Pentax in this thread: https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/330279-sho...ml#post3779622 Addendum 2: Originally posted by aslyfox could it be one of these? https://www.pentaxforums.com/userreviews/tamron-af-28-200mm-f-3-8-5-6-xr-di-...-if-macro.html I regard it as a mistake in PFs lens review database to mix up all the versions. In the first link I posted Tamron describes how different these lenses are.... Last edited by UMC; 08-05-2019 at 01:10 PM.

08-05-2019, 01:31 PM - 1 Like	#5
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by doc_taz_nj Note the reading from the RawTherapee screenshot. Samsung/Schneider... so this is a Kreuznach design? Nope, it means that it returns a lens id code that RawTherapy interprets as belonging to the Samsung/Schneider D-XENON 50-200/4.0-5.6 lens. Why that might be is anyone's guess. FWIW, the D-Xenon 50-200 is a relabeled Pentax DA 50-200 and not a Kreuznach design either. Tamron made several versions of the 28-200/3.8-5.6. I bought a similar one for my daughter in 2007 and it is a decent performer, if a little bulky. Steve It is not unusual for third-party lenses to return the same lens codes as lenses by other makers, though in this case, I suspect an error in the RawTherapee look-up table. Last edited by stevebrot; 08-05-2019 at 01:46 PM. Reason: Clarity

08-07-2019, 12:11 AM	#9
kypfer Pentaxian Join Date: Jan 2018 Location: Jersey C.I. Posts: 3,594	Originally posted by UMC According to Tamron they started developing the 28-200 in the late 80ies and the first one to appear on the market was the 71x, which was - to the best of my knowledge - the only generation, that appeared as Adpatall-2 (71A) and fixed mount (71D). Not quite! The 171A was Adaptall-2 as well. I've still got my fungus-ridden example and approached Tamron UK about getting it cleaned a few years ago when it finally got too bad to use, but it was "a service they can no longer supply!". They were also "unable" to provide strip-down instructions, which was a bit of a bleep, but probably understandable! Last edited by kypfer; 08-07-2019 at 12:13 AM. Reason: spelling

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08-05-2019, 12:39 PM	#2
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581	could it be one of these ? https://www.pentaxforums.com/userreviews/tamron-af-28-200mm-f-3-8-5-6-xr-di-...-if-macro.html

08-05-2019, 01:14 PM - 1 Like	#4
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581	Originally posted by UMC . . . I regard it as a mistake in PFs lens review database to mix up all the versions. In the first link I posted Tamron describes how different these lenses are.... thanks for the correction

08-05-2019, 01:55 PM	#6
doc_taz_nj Forum Member Join Date: Dec 2011 Location: Somewhere in Northern NJ, USA Photos: Gallery Posts: 74 Original Poster	Ah, thanks for the point about it being mislabeled. That did seem sketchy to me. 1992, wow! I scored my copy for $32 via a Japanese seller on eBay. I'm just glad it works with all four of my Pentax bodies. Not as good at close focus as my Tamron 18-200, but I'm fine with it running at the equivalent 42-300 range for the K-x and K-70.

08-05-2019, 02:47 PM - 1 Like	#7
kypfer Pentaxian Join Date: Jan 2018 Location: Jersey C.I. Posts: 3,594	I wonder how well related these "modern" fixed-mount lenses are to the Adaptall-2 originals. I had one of the #71A's when they were new (mid to late '80's, at a guess) and replaced it with a #171A when they became available. The first was a vari-focal design, in that the focus changed as the lens was zoomed, and it only had a minimum focus of about 6ft, as I remember. The later lens was (is) far more user-friendly, which stayed in focus as you zoomed and with a minimum focus of 3ft. The first had a rotating front element, so the lens hood was fairly minimal, but the later had a "petal" hood which was far more efficient. My example unfortunately developed haze/fungus deep in the internals and was retired only a couple of years ago

08-05-2019, 11:31 PM	#8
UMC Senior Member Join Date: Dec 2012 Location: Vienna Photos: Gallery Posts: 205	Originally posted by kypfer I wonder how well related these "modern" fixed-mount lenses are to the Adaptall-2 originals. I had one of the #71A's when they were new (mid to late '80's, at a guess) and replaced it with a #171A when they became available. The first was a vari-focal design, in that the focus changed as the lens was zoomed, and it only had a minimum focus of about 6ft, as I remember. The later lens was (is) far more user-friendly, which stayed in focus as you zoomed and with a minimum focus of 3ft. The first had a rotating front element, so the lens hood was fairly minimal, but the later had a "petal" hood which was far more efficient. My example unfortunately developed haze/fungus deep in the internals and was retired only a couple of years ago According to Tamron they started developing the 28-200 in the late 80ies and the first one to appear on the market was the 71x, which was - to the best of my knowledge - the only generation, that appeared as Adpatall-2 (71A) and fixed mount (71D). Originally posted by kypfer .... and replaced it with a #171A when they became available. ... with a minimum focus of 3ft. .... That is exactly what Tamron mentions as the main advantage of the 171D in their history of 28-200s. BTW, the 171D is the technical basis of the smc Pentax-FA 1:3.8-5.6 28-200mm -IF&AL-. Actually they seem to be identical apart from the exterior "Pentax-look" and the SMC coating of course. I once compared the optical performance of the 71D and the Pentax FA 28-200 (~Tamron 171D) and noticed a slight advantage of the Pentax. However, today on the K-1 it is simply not good enough to provide satisfactory results.

08-07-2019, 12:37 AM	#10
UMC Senior Member Join Date: Dec 2012 Location: Vienna Photos: Gallery Posts: 205	Originally posted by kypfer ... The 171A was Adaptall-2 as well .... Thank you very much for this information. The 171A seems to be a very rare beast. I've been collecting pictures of K-Mount lenses since 2012 and thus came across some 5000(!) different lenses and variants of lenses, but I've never seen the 171A. I would be more than happy if you could send me some pictures of the lens (either PM or post it in this thread).

08-07-2019, 12:16 PM - 1 Like	#12
UMC Senior Member Join Date: Dec 2012 Location: Vienna Photos: Gallery Posts: 205	Now that we have hijacked this thread, I have to thank you for posting this picture. Surprisingly the 171A does not look like the 171D at all, but rather like the much later 371D.

08-07-2019, 02:00 PM	#13
doc_taz_nj Forum Member Join Date: Dec 2011 Location: Somewhere in Northern NJ, USA Photos: Gallery Posts: 74 Original Poster	No worries about the hijacking. I'm learning a lot from you folks.

08-07-2019, 03:20 PM	#14
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	Originally posted by UMC BTW, the 171D is the technical basis of the smc Pentax-FA 1:3.8-5.6 28-200mm -IF&AL-. . The FA 28-200 is based on the 271D. Different optical formula... 171D 15 elements in 13 groups, 271D 16 elements in 14 groups.

08-08-2019, 11:39 AM	#15
UMC Senior Member Join Date: Dec 2012 Location: Vienna Photos: Gallery Posts: 205	Originally posted by boriscleto The FA 28-200 is based on the 271D. Different optical formula... 171D 15 elements in 13 groups, 271D 16 elements in 14 groups. I would like to challenge this: According to the Japanese Tamron site (171D and 271D) 171D and 271D are identical apart from the exterior appearance. They are both listed as 16 elements in 14 groups with a minimal focusing distance of 0.52 m. These are exactly the same specifications that Pentax lists in their 1998 edition of the "smc Pentax-FA interchangeable lenses" manual. The later model 371D is also similar but has a slightly better focusing distance of 0.49m.