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Forum: Pentax SLR Lens Discussion 12-03-2020, 01:48 PM  
Pentax Lens 500mm F8 in T2? Really?
Posted By UMC
Replies: 5
Views: 676
Thank you very much. Taking your hint as an input for a quick google research quickly revealed that in fact Pentax spotting scopes have a removable eye piece - attached with a T2 thread.


You live and learn.
Forum: Pentax SLR Lens Discussion 12-03-2020, 01:25 PM  
Pentax Lens 500mm F8 in T2? Really?
Posted By UMC
Replies: 5
Views: 676
Today a 500mm F8 mirror lens labeled "Pentax 500" popped up on Ebay: Compact PENTAX 500mm Reflex lens in T2 mount to fit most S.L.R.'s, with lenshood | eBay
I have collected pictures of more than 5000 different K-mount lenses over the past 8 years, but I have never come across this strange thing.

Does anybody have a clue if this is really a Pentax lens? I have my doubts.


Just curious...
Forum: Film Processing, Scanning, and Darkroom 11-04-2020, 05:04 AM  
Slide and neg scanner....
Posted By UMC
Replies: 21
Views: 5,179
Regarding dust:
Dust is a pain, especially with flatbed scanners. Although the built in ICE dust correction of my V550 works pretty well and even though I blow off all my negatives before the scan with an airbrush compressor, I still find myself correcting 5-50 tiny fluffs, scratches and stains on every single TIFF. However, I should mention, that the majority of my negatives is 30-70 years old...
Important: Do not only blow off the negatives, but also keep the scanners glass clean and blow it off before every scan!

Regarding resolution:
According to the datasheet the Epson V500/V550 has an optical resolution of 6400x9600 dpi. As a rule of thumb you can at least reduce these values by half, as most of the test reports reveal that resolution values in scanner datasheets are tremendously exaggerated. I usually scan with 3200 dpi which yields TIFFs with ~3000 x 4500 pix for a 35mm negative, which brings us somewhere in the range of 14 Mpixel. Since I mostly scan films from the 50ies and 60ies, this is good enough to reveal the film grain! Maybe new material has better resolution, however, I think a 16 Megapixel scan/DSLR photo is good enough for any amateur purpose.

Regarding DSLR instead of scanner:
I used my good old bellows with the attached slide copier to "scan" problematic originals, mainly ones with extreme contrast. In fact, the K-1 has a real edge over the scanners when it comes to digitizing underexposed slides. But the dust problem remains and is sometimes even worse, as the DSLR naturally doesn't have any technology of dust removal as most of the scanners have.
Forum: Film Processing, Scanning, and Darkroom 08-27-2020, 04:27 PM  
Slide and neg scanner....
Posted By UMC
Replies: 21
Views: 5,179
Having scanned some 1000+ negatives and more than 10000 slides, I can contribute a few hints:
  • I scan in TIF format and process the TIFs in Lightroom like any other RAW file

  • If slides are stored in magazines, it is best to invest in a dedicated slide scanner like the Reflecta DigitDia series (=Pacific Image Electronics PowerSlide series)

  • The disadvantage of the above mentioned scanners is that they can't handle negatives. For these I recommend the Epson V550 - best bang for the buck

  • A good, high resolution scan of a 35mm slide or negative takes 2+ minutes: My Reflecta DigitDia 4000 takes some 3h for a standard magazine with 50 slides, the Epson V550 takes approx. 10 minutes for a stripe of 5 negatives

  • Even if stored properly, usage of compressed air for blowing off the slides and negatives is highly recommended. I use a Revell air brush compressor

  • Dust removal technology like ICE is a must - unless you want to spend the rest of your life retouching all the small dust particles in Photoshop

  • Calibrating the scanners is highly recommended - I use targets from coloraid.com

  • I use VueScan for scanning slides with the Reflecta and for prints with the Epson - the software requires some training efforts, but it does a very good job

  • For degraded material (faded slides and negatives) I use the Epson V550 with the built in color restoration feature of the Epson Scan program

  • Last but not least, the V500 can scan medium format too


Bottom line:
  • You will not achieve satisfactory results on the first day - you need experience and you have to find the aproach that fits your needs

  • If you have more than a few dozens of films, be prepared to face the truth: You are going to spend a significant amount of time on the scanning job!

  • Don't hesitate to grab your slide projector from the shelf and compare your scans with projected slides

Forum: Troubleshooting and Beginner Help 08-06-2020, 09:03 AM  
Prinzflex MC ZOOM 70-162mm ; 1:3.5
Posted By UMC
Replies: 3
Views: 552
Definitely Pentax K-Mount
Forum: Pentax SLR Lens Discussion 08-01-2020, 10:42 AM  
Looking 4 a review on the Rokinon Auto Zoom 28-80mm f/3.5-4.5 Macro
Posted By UMC
Replies: 5
Views: 870
Here is where it gets interesting: The lens shown above has a "Made in Japan" label. There is a good chance that this lens has no Samyang genes at all: Rokina vs. Rokinon - Past vs. Present

BTW, apparently the same lens existed with other badge names too:
  • MC Auto Zoom CPC CCT 28-80mm Macro 1:3.5-4.5

  • Gemini Macro Zoom 28-80mm 1:3.5-4.5 MC [caution: a different version of this lens exists under the very same name]

  • Hanimex MC Auto Zoom 28-80mm 1:3.5-4.5 Macro

  • MC Hanimex Auto Zoom 28-80mm 1_3.5-4.5 Macro

  • Marexar-CX Zoom 1:3.5-4.5 f=28-80mm Multi-Coated

  • MC Rokinon Auto Zoom 28-80mm 1:3.5-4.5 Macro

  • MC Sakar Zoom 28-80mm 1:3.5-4.5 Macro [2 variants with different rubber]

  • MC Soligor Zoom Macro 28-80mm C_D F:3.5-4.5

  • MC Sun Zoom 28-80mm 1:3.5-4.5 Macro

  • MC Sun Zoom Lens 28-80mm 1:3.5-4.5 Macro

  • MC TOU/Five Star Auto Zoom 28-80mm 1.3.5-4.5 Macro

Out of this list I think Sun was the only company that designed and produced lenses. Therefore my guess is that the "MC Rokinon Auto Zoom 28-80mm 1:3.5-4.5 Macro" was made by Sun in Japan.

At the time this lens was made (presumably early 80ies), Sigma and Tokina had there own designs which in same cases also appeared in rebranded variants. However, the vast majority of the no-name 28-80 3.5-4.5 can be traced down to a Makinon design, a Cimko design, the above mentioned Sun and another one, which I still need to find out who made it.
Forum: Pentax SLR Lens Discussion 05-17-2020, 03:17 AM  
Please help me identify my lens!
Posted By UMC
Replies: 23
Views: 1,488
Well, there is one for sale in Germany right now: TOKINA AT-X 2,8/60-120 PENTAX K BAJONETT - SHC Art. 758077 | eBay

The price is not a bargain, but the seller accepts offers.
Forum: Pentax Film SLR Discussion 05-09-2020, 04:38 AM  
ME Super Jammed Shutter!
Posted By UMC
Replies: 18
Views: 1,103
Congratulation! It really feels good to hold a working camera in your hands, knowing it is the outcome of your own effort.
Forum: Pentax Film SLR Discussion 05-08-2020, 02:27 PM  
ME Super Jammed Shutter!
Posted By UMC
Replies: 18
Views: 1,103
Let me get something straight - I am in no way any sort of expert for ME repairs... The only reason why I collected all these docs is my own collection of ME Super, ME-F, Super A and MV, which all of them suffered from "the classic" ME issues. However, the "shutter speed down"-button on my ME Super stopped working all of a sudden years ago. I purchased a new cover because I suspected a contact problem of the button itself, but yet I didn't have the guts to open my ME Super and get the job done.
Forum: Pentax SLR Lens Discussion 05-07-2020, 03:29 PM  
Bauer Neovaron Lenses
Posted By UMC
Replies: 13
Views: 979
Bauer may have been famous for their movie-cameras, however in stills photography as far a K-mount is concerned it was just a brand name on Cosina OEM stuff. I remember very well that in the late 70ies all of a sudden a bunch of companies started stickering their famous names on Cosina cameras and lenses. Agfa, Alpa, Bauer, Petri, Miranda - just to name a few

Bauer had a small amount of primes, which all of them looked very much like their Cosina siblings. I know of 28/2.8, 40/2.5, 50/1.4, 50/1.7, 135/2.8 and 200/3.5

This 40/2.5 was available as:
  • Cosinon Auto MC F=2.5 f=40mm

  • Bauer Neovaron 1:2.5/40mm Multicoated


A different version (easy to determine from the bayonet side) was sold as:
  • Cosina MC Cosinon-S 40mm 1:2.5

  • Porst Color Reflex MC Auto 1:2.5/40mm

  • VMC Vivitar 40mm 1:2.5 Auto

Forum: Pentax Film SLR Discussion 05-07-2020, 03:09 PM  
ME Super Jammed Shutter!
Posted By UMC
Replies: 18
Views: 1,103
Glad to hear that your camera is somewhat back to live. I assume, you already saw my collection of ME-Super repair documents, which I linked here Looking for an ME Super Disassembly Guide with photos - PentaxForums.com
Forum: Pentax Film SLR Discussion 04-18-2020, 12:21 AM  
Pentax ME Super stuck aperture coupling ring on camera body
Posted By UMC
Replies: 5
Views: 700
Hi Ron, welcome to the forum! I must confess, my last repair on a ME series camera was many years ago and I never dealt with problems on the aperture simulator (although my ME super has some internal contact problems there). Given the high availability and the low price level of ME supers on the 2nd hand market, I doubt that repair other than DIY makes sense.
Forum: Pentax SLR Lens Discussion 04-17-2020, 03:45 PM  
Polar Lens
Posted By UMC
Replies: 2
Views: 739
The brand name Polar is a bit of a mystery to me.

Nowadays it is being used as one of the many brands of the contemporary Samyang lens line. At least i know that the Samyang 85mm 1.4 exists with a "Polar" label on.

Presumably in the 80ies Polar seems to have been a store or sales brand for "cheapo" OEM lenses from the likes of early Samyang. I assume that it must have been particularly popular in Italy or even a brand by an Italian distributor. I know of the following list of lenses available in K-mount:
  • Polar Automatic MC 1:2.8 f=28mm (K)

  • Polar Automatic MC 1:2.8 f=28mm (KAR)

  • Polar Automatic MC 1:2.8 f=28mm [with Macro function] (K) [most likely Samyang]

  • Polar Automatic MC 1:2.8 f=28mm [with Macro function] (KAR) [most likely Samyang]

  • Auto Polar MC 1:2.8 f=135mm [looks like Samyang]

  • Polar MC 135mm Macro 1:2.8

  • Polar MC Auto Zoom 1:4.0-4.5 f=18-28mm (KAR) [Samyang - it also exists as Beroflex, Cambron, Centon, Exakta, Goko, Maginon, Panagor, Phoenix/Samyang, Sakar, Samyang, Sears, Sirius, Tokura]

  • Polar MC Auto Zoom 1:3.5-4.5 f=28-70mm (KAR) [2 different variants]

  • Polar MC Auto Zoom 1:3.5-4.5 f=28-85mm (KAR)

  • Polar MC Auto Zoom 1:4-5,6 28-200mm (KAR) [3 different variants]

  • Polar MC Auto Zoom 1:4.0-5.6 f=60-300mm

  • Polar MC Auto Zoom 1:3.9 f=70-210mm

  • Polar MC Auto Zoom 1:4.0 f=70-210mm (KAR)

  • Polar MC Auto Zoom 1:4.0-5.6 f=70-210mm (KAR) [2 different variants]

  • Polar MC Auto Zoom 1:3.9 f=80-200mm [2 different variants]

  • Auto Zoom Polar MC 1:4.5 f=80-200mm

  • Polar MC Auto Zoom 1:4.5 f=80-200mm

Now I would be very curious to see photos of your lenses....
Forum: Pentax SLR Lens Discussion 04-06-2020, 12:25 PM  
[?] Lens identification, Noname/Seikanon 28-80mm F3.5-4.5, ca. 1980
Posted By UMC
Replies: 7
Views: 753
The Seikanon 28-80/3.5-4.5 apparently was made by Cimko (see some more info here: What do all the graduations and markings mean on lenses? - PentaxForums.com)

The lens is a "classic" early 80ies OEM lens, that was sold under many different brands:

Super Albinar MC 1:3.5-4.5 f=28-80mm
MC Auto-Beroflex 1:3.5-4.5 f=28-80mm
MC Cimko MT Series 1:3.5-4.5 f=28-80mm
MC Cimko MT Series 1:3.5-4.5 f=28-80mm (different rubber)
MC Fotomat Series-35 Auto Zoom 1:3.5-4.5 f=28-80mm
MC Image Auto Zoom 1:3.5-4.5 f=28-80mm
Super Paragon PMC Auto Zoom 1:3.5-4.5 f=28-80mm
Auto Promaster Spectrum 7 MC 1:3.5-4.5 f=28-80mm
MC Rokinon Auto Zoom f=28-80mm 1:3.5-4.5 Macro
MC Sakar Marco 1:3.5-4.5 28-80mm
MC Seikanon Auto Zoom 1:3.5-4.5 28-80mm
MC Seikanon Auto Zoom 1:3.5-4.5 28-80mm (different rubber)
Star-D Gold Line MC 1:3.5-4.5 f=28-80mm

There was a very similar 28-80/3.5-4.5 made by Sun Opitical, also sold under many names, but this one has a significantly different focusing scale.
Forum: Pentax SLR Lens Discussion 01-01-2020, 08:24 AM  
Rokinon 28mm 2.8?
Posted By UMC
Replies: 6
Views: 1,836
The history of Rokinon is quite unclear. I spent significant time searching various internet resources, but there is no solid evidence.

While Rokinon today solely refers to rebadged Samyang lenses, there may have been a time, when a presumably Japanese company called "Rokina Optical Company" existed. On the other hand a registered US trademark for the name "Rokinon" existed between the early 80ies until 2002 and was held by a company called "Rokina International".

However, I know of roughly 2 dozens of different 28/2.8 lenses all labeled "Rokinon":

Auto Macro Rokinon MC 1:2.8 f=28mm [KA], "Japan", 4 knobs rubber, very wide aperture ring

Auto Rokinon MC 1:2.8 f=28mm [KA], "Made in Japan", 3 rectangular knobs rubber

Auto Rokinon MC 1:2.8 f=28mm [KAR], "Made in Japan", 3 rectangular knobs rubber
Auto Rokinon MC 1:2.8 f=28mm [KAR], "Lens made in Korea", 3 knobs rubber

MC Auto Macro Rokinon 1:2.8 f=28mm [K], "???", 3 knobs rubber
MC Auto Macro Rokinon 1:2.8 f=28mm [KA], "Lens made in Japan", 6 knobs rubber, very wide aperture ring
MC Rokinon Wide-Auto F:2.8 f=28mm [K], "Lens made in Japan", 3 knobs rubber
MC Rokinon Wide-Auto F:2.8 f=28mm [K], "Lens made in Japan (?)", 3 rectangular knobs rubber
Rokinon 1:2.8 28mm MC [K], "Lens made in Japan", 2 vertical rectangular knobs rubber, shape of lens suggests Cosina origin

Rokinon 1:2.8 28mm MC [K], "Lens made in Japan", long vertical rectangular knobs rubber, shape of lens suggests Cosina origin

Rokinon Auto MC 1:2.8 f=28mm [K], "Lens made in Japan (?)", 3.5 knobs rubber, inscription around top end of barrel
Rokinon Auto MC 1:2.8 f=28mm [K], "Lens made in Japan", 4 rectangular knobs rubber, inscription around top end of barrel
Rokinon Auto SC 1:2.8 f=28mm [K], "Lens made in Japan", 4.5 knobs rubber
Rokinon Automatic 1:2.8 f=28mm [K], "Lens made in Japan", 6 knobs rubber
Rokinon Automatic Wide MC 1:2.8 f=28mm [K], "Lens made in Japan", 5.5 knobs rubber
Rokinon M.C 1:2.8 f=28 [K], "Korea", 6 knobs rubber, white engraving on aperture ring


Rokinon M.C 1:2.8 f=28 [K], "Korea", 6 knobs rubber, green engraving on aperture ring
Rokinon M.C 1.2.8 f=28mm [K], "Lens made in Korea", 6 knobs rubber
Rokinon MC 1:2.8 f=28mm [K], "Lens made in Japan", 4 knobs rubber
Rokinon MC 1:2.8 f=28mm [K], "Lens made in Japan", 4 knobs rubber, different aperture ring
Rokinon MC Auto1:2.8 f=28mm [K], "Japan (?)", 4 knobs rubber
Rokinon MC Automatic 1:2.8 f=28mm [K], "Lens made in Korea", 3 knobs rubber (looks identical to Sears 202.736890)

Rokinon MC Automatic 1:2.8 f=28mm [KAR], "Lens made in Korea", 3 knobs rubber (looks identical to Sears 202.7368000)

Rokinon Wide-Auto 1:2.8 f=28mm [KAR?], "???", 4 rectangular knobs rubber
Rokinon Wide-Auto 1:2.8 MC f=28mm [K], "Lens made in Japan", 3 knobs rubber

Bottom line: These 25 lenses most likely were made by multiple manufacturers, the question "how good is a Rokinon 28 f2.8" is impossible to answer.


As for the history of Rokina / Rokinon: I tend to believe that indeed there was at least a US company called Rokina which sold rebadged OEM stuff from Japan and Korea. I doubt that 40 years ago Samyang, as the first Korean lens producer, would have rebadged Japanese lenses. There even may have been a Japanese producer of lenses also called Rokina. The only thing we know for sure, is today Samyang holds and uses the Rokinon brand for their actual portfolio.
Forum: Pentax SLR Lens Discussion 12-01-2019, 06:29 AM  
Komura 135mm f/2.5
Posted By UMC
Replies: 3
Views: 933
According to rare sources on the internet Komura seems to have been a small, independent Japanese manufacturer of lenses that went out of business in the early 80ies. Apart from various lenses in T2 and other interchangeable mounts they made at least 10 different lenses for K-mount:
  • Komuranon f=28mm 1:2.5

  • K.M.C Komuranon f=28mm 1:2.8

  • Komuranon f=135mm 1:2.5

  • K.M.C Komuranon f=135mm 1:2.8

  • K.M.C. Komuranon f=300mm 1:4.5

  • K.M.C Komuranon Zoom 24.35 1:3.5 f=24-35mm

  • K.M.C Komuranon Zoom 35.70 1:3.5-4.5 f=35-70mm

  • K.M.C Komura-FX 721 1:4.5 f=70-210mm

  • MC Komuranon 820 Zoom Lens 1:4.5 f=80-200mm

  • K.M.C. Komuranon 821 Zoom Lens 1:4.5 f=80-210mm

  • K.M.C. Komuranon 821-S Zoom Lens 1:4.5 f=80-210mm

The lenses have an extremely solid looking shape, however given that all of them have been designed and made in the 70ies, I would not expect any particular optical quality. Comparing to the Pentax I think they certainly have the disadvantage that they could not offer the cutting-edge technology "SMC" that Pentax had at that time.
Forum: Site Suggestions and Help 08-10-2019, 11:39 PM  
Error in lens database
Posted By UMC
Replies: 5
Views: 511
Thanks, Adam, for reshuffling the posts and pictures. I'm still checking, what to do about more pictures, I'll let you know soon.
Forum: Site Suggestions and Help 08-09-2019, 03:49 PM  
Error in lens database
Posted By UMC
Replies: 5
Views: 511
I have now added the 4 major generations of the Tamron 28-200, which altogether would replace the existing 28-200 entry (Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database).
The picture AF 28-200mm F/3.8-5.6 LD IF Aspherical - Pentax Lens Review Database would belong to this thread Tamron AF Aspherical LD 28-200mm 1:3.8-5.6 [Model 171D, 271D, 571D, 171A] Lens Reviews - Tamron Lenses - Pentax Lens Review Database, while the picture AF 28-200mm F/3.8-5.6 LD IF Aspherical - Pentax Lens Review Database should be moved to this thread Tamron AF Aspherical XR (Di) IF 28-200mm 1:3.8-5.6 Macro [Model A03, A03s, A031] Lens Reviews - Tamron Lenses - Pentax Lens Review Database.


Sorting the reviews is a lot more complicated:

The newest review speaks of model 571 with a filter size of 62mm - something that simply doesn't exist. Taking for granted that the 62mm are correct, then the post Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database belongs to here: Tamron AF Aspherical XR (Di) IF 28-200mm 1:3.8-5.6 Macro [Model A03, A03s, A031] Lens Reviews - Tamron Lenses - Pentax Lens Review Database
The 2nd post Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database precisely assigns pictures to different versions, but falsely assumes that his Promaster Spectrum 7 XR 28-200 is based on the 571D, which again is not correct, but it is based on the A03... So I would put this post due to the majority of pictures to Tamron AF Aspherical LD 28-200mm 1:3.8-5.6 [Model 171D, 271D, 571D, 171A] Lens Reviews - Tamron Lenses - Pentax Lens Review Database
The 3rd post Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database simply goes here Tamron AF Aspherical LD 28-200mm 1:3.8-5.6 [Model 171D, 271D, 571D, 171A] Lens Reviews - Tamron Lenses - Pentax Lens Review Database
The next one Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database doesn't indicate anything - the EXIFs of the image even make me doubt that it is a 28-200 at all.
This one Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database simply goes here Tamron AF Aspherical LD 28-200mm 1:3.8-5.6 [Model 171D, 271D, 571D, 171A] Lens Reviews - Tamron Lenses - Pentax Lens Review Database
The next one Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database shall be moved to Tamron AF Aspherical LD IF 28-200mm 1:3.8-5.6 Macro [Model 371D, 471D] Lens Reviews - Tamron Lenses - Pentax Lens Review Database
This one Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database and this one Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database clearly refer to Tamron AF Aspherical XR (Di) IF 28-200mm 1:3.8-5.6 Macro [Model A03, A03s, A031] Lens Reviews - Tamron Lenses - Pentax Lens Review Database
All other posts are unclear/ambiguous and should remain where they are - if you decide to keep the old thread. If you choose to eliminate the old thread, they probably should be moved here: Tamron AF Aspherical LD 28-200mm 1:3.8-5.6 [Model 171D, 271D, 571D, 171A] Lens Reviews - Tamron Lenses - Pentax Lens Review Database

In either case, thanks Adam for encouraging me to attempt to bring order into this issue...

A last question in this story: I do have pictures of each generation of these lenses, but I do not own the copyright of these. Shall I open a new thread and ask the community to provide the missing pictures?
Forum: Pentax SLR Lens Discussion 08-08-2019, 02:21 PM  
About my Tamron 28-200 lens
Posted By UMC
Replies: 17
Views: 1,223
Thanks for encouraging me. At last I sent a note to the admins ;-)
Forum: Site Suggestions and Help 08-08-2019, 02:18 PM  
Error in lens database
Posted By UMC
Replies: 5
Views: 511
Dear moderators/site-admin,
as pointed out in this thread About my Tamron 28-200 lens - Page 2 - PentaxForums.com, it does not contribute to proper ratings, if all generations of the Tamron 28-200 are mixed together in one thread. The different versions are:
* Tamron AF Aspherical 28-200mm 1:3.8-5.6 [71D] see Google Übersetzer
* Tamron AF Aspherical LD 28-200mm 1:3.8-5.6 [Black: 171D, Silver: 271D] see: Google Übersetzer and Google Übersetzer
* Tamron AF Aspherical LD IF 28-200mm 1:3.8-5.6 Macro [Black: 371D, Silver: 471D] see: Google Übersetzer and Google Übersetzer
* Tamron AF Aspherical LD IF 28-200mm 1:3.8-5.6 [571D] see Google Übersetzer
* Tamron AF Aspherical XR IF 28-200mm 1:3.8-5.6 Macro [Black: A03, Silver A03S], 2 versions of each with different rubber see: Google Übersetzer and Google Übersetzer
* Tamron AF Aspherical XR Di IF 28-200mm 1:3.8-5.6 Macro [A031] see TAMRON | News | Introducrion of the new A031

Best regards
Matthias

Thread URL: Tamron ( Promaster ) 171D, 271D .... 571D AF 28-200mm F/3.8-5.6 LD IF Aspherical Lens Reviews - Tamron Lenses - Pentax Lens Review Database
Forum: Pentax SLR Lens Discussion 08-08-2019, 11:39 AM  
About my Tamron 28-200 lens
Posted By UMC
Replies: 17
Views: 1,223
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.
Forum: Pentax SLR Lens Discussion 08-07-2019, 12:16 PM  
About my Tamron 28-200 lens
Posted By UMC
Replies: 17
Views: 1,223
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.
Forum: Pentax SLR Lens Discussion 08-07-2019, 12:37 AM  
About my Tamron 28-200 lens
Posted By UMC
Replies: 17
Views: 1,223
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).
Forum: Pentax SLR Lens Discussion 08-05-2019, 11:31 PM  
About my Tamron 28-200 lens
Posted By UMC
Replies: 17
Views: 1,223
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).


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.
Forum: Pentax SLR Lens Discussion 08-05-2019, 12:52 PM  
About my Tamron 28-200 lens
Posted By UMC
Replies: 17
Views: 1,223
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:

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....
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