We all know there is a ton of great FF glass available on the used market that will work great with the K-1.

However, which are the currently available FF lenses (in current catalogues of lens manufacturers) that can be used with the K-1?

Below is a list that started with an initial compilation I did and then attracted a number of later additions by several contributors. There may be still some missing and please post to this thread with information about the lens (but please make sure the lens is in production). I'll then add it to the list.

If you have used any of the listed lenses on the K-1 and find that they do not perform like a proper FF lens, please post to this thread as well. There are some DA (APS-C) lenses included which have been tested as "good for FF" on film cameras but due to differences between film and digital sensors, there may be a few surprises (although I tried to be conservative and only included those that would be true surprises if they failed the "K-1 test".)

Thanks in advance.

P.S.: I realise that there is also another current FF lenses overview but the latter contains discontinued lenses and I think there is value in maintaining a list of lenses that can be bought brand new. Not everyone is prepared to go hunting on the used market. A very nice feature of the aforementioned alternative compilation is that many third-party FF lenses can found organised in roadmap-style charts.

Regarding the suitability of certain DA (APS-C) lenses, I included a few that a truly FF capable based on their design and user reports. There is a far larger number of DA lenses with OK to marginal performance on an FF camera. These have not been included in this list, even though some users may find them acceptable (in particular using the K-1's 1:1 crop mode). A useful resource on the performance of DA lenses on an FF camera is falconeye's "DA lenses on Full Frame: Test shots" thread.

Pentax
Zooms
HD Pentax-D FA 15-30mm F2.8 ED SDM WR
HD Pentax-D FA 24-70mm F2.8 ED SDM WR
HD Pentax-D FA 28-105mm F3.5-5.6 ED DC WR
HD Pentax-D FA* 70-200mm F2.8 ED DC AW
HD Pentax-D FA 70-210 mm f/4 ED SDM WR
HD Pentax-D FA 150-450mm F4.5-5.6 ED DC AW

SMC Pentax-DA* 60-250mm F4 ED [IF] SDM
(some vignetting in particular at 250 but very usable;
some owners replace an internal baffle to reduce the vignetting)

Primes
HD Pentax-D FA 21mm f/2.4 ED Limited DC WR
HD Pentax-FA 31mm f/1.8 Limited
HD Pentax-FA 43mm f/1.9 Limited
HD Pentax-FA 77mm f/1.8 Limited


HD Pentax-FA 35 mm f/2
SMC Pentax-FA 50mm F1.4

HD Pentax-D FA* 50mm F1.4 SDM AW
HD Pentax-D FA* 85mm F1.4 SDM AW

SMC Pentax-D FA 50mm F2.8 Macro
SMC Pentax-D FA 100mm F2.8 Macro WR

APS-C Primes, performing well on FF
SMC Pentax-DA 35mm F2.4 AL
SMC Pentax-DA 50mm F1.8
SMC Pentax-DA* 55mm F1.4 SDM
SMC Pentax-DA* 200mm F2.8 ED [IF] SDM
SMC Pentax-DA* 300mm F4 ED [IF] SDM
HD Pentax-DA 560mm F5.6 ED AW


Sigma (as long as current stock lasts)
Zooms
70-300mm F4-5.6 APO DG Macro
70-300mm F4-5.6 DG Macro
50-500mm F4.5-6.3 APO DG OS HSM

Primes
15mm F2.8 EX DG Diagonal Fisheye
28mm F1.8 EX DG ASP RF
35mm F1.4 DG HSM | A
85mm F1.4 EX DG HSM
300mm F2.8 EX APO DG (HSM)*
500mm F4.5 EX DG APO (HSM)*



Tamron
Zooms
SP AF 28-75mm f/2.8 XR Di LD Aspherical [IF] Macro
AF 70-300mm f/4-5.6 Di LD Macro 1:2


Samyang
Primes
12mm F2.8 ED AS NCS Fisheye
14mm F2.8 ED AS IF UMC
20mm F1.8 ED AS UMC
24mm F1.4 ED AS IF UMC
24mm F3.5 ED AS UMC TILT/SHIFT
35mm F1.4 AS UMC
50mm F1.4 AS UMC
85mm f/1.4 AS IF UMC
100mm f/2.8 Macro
135mm f/2 ED UMC
(Most, if not all, of the above are also available as "Cine" lenses that for instance feature click-less apertures.)

500mm MC f/6.3 Mirror (best Samyang mirror lens, decent sharpness but awful bokeh)
500mm MC IF f/8 Mirror
800mm MC f/8 Mirror
500mm MC f/8 Preset (not mirror, a little bit long but very light with decent sharpness)
650-1300mm f/8-f/16 (long and light, almost usefull as a monopod)
(The above comments come courtesy of banep, thanks!)


Schneider-Kreuznach
Primes
PC-TS 4.5/28MM Super-Angulon Tilt/Shift
PC-TS 2.8/50MM Super-Angulon Tilt/Shift
PC-TS 4.5/90MM Makro Symmar Tilt/Shift


Laowa (Venus Optics)
Primes
12mm f/2.8 Zero-D
15mm f/4.5 Zero-D Shift
15mm f/4.5R Zero-D Shift
15mm f/4 1:1 Macro
20mm f/4 Zero-D Shift
25mm f/2.8 Ultra Macro (2.5-5 x magnification, no infinity focus)
60mm f/2.8 2:1 Macro (2x life size magnification)
100mm f/2.8 2x Ultra Macro APO
105mm f/2 (t/3.2) STF (Smooth Transition Focus)

Irix
Primes
Irix 15mm f/2.4
Irix 11mm f/4
Irix 21mm f/1.4 Dragonfly
Irix 30mm f/1.4 Dragonfly
Irix 45mm f/1.4
Irix 150mm f/2.8 Macro 1:1 (Dragonfly)

AraxFoto
Arax 35mm f/2.8 Tilt & Shift
Arax 80mm f/2.8 Tilt & Shift

Meyer-Optik Görlitz (liquidated in 2018, but revived in 2020)
Primes

Lydith 30mm f/3.5
Trioplan 35+ f/2.8
Nocturnus 50 mm f/0.95 (DSLR variant)
Primotar X 50mm f/2.8
Trioplan 50mm f/2.9
Primoplan 58mm f/1.9
Primoplan 75mm f/1.9
P75 II (advanced version of the Primoplan 75)
Somnium II 85mm f/1.5

Lydith 30 f3.5 II
Trioplan 35mm f/2.8 II
Trioplan 50 f/2.8 II
Biotar 58mm f/1.5 II
Biotar 75mm f/1.5 II
Primoplan 58mm f/1.9 II
Primoplan 75mm f/1.9 II
Trioplan 100 f2.8 II


Apo-Makro-Plasmat 105mm f/2.7

net SE (-> resurrection of Meyer-Optik Görlitz, Emil Busch and Oprema Jena lenses, liquidated in 2018)
C. P. Goerz Citograph 50mm f/2.8 (currently a Kickstarter project)
Emil Busch Glaukar Anastigmat 97mm f/3.1 (scaled version of the 1910 Glaukar 210mm f/3.1, a lens for 8x10cm and 13x18cm field cameras)
Oprema Jena Biotar 75mm f/1.5 (re-edition of the Carl Zeiss Biotar 75mm f/1.5 (Willy Merté, 1938))


Zeiss (M42 mount lenses; require an M42 -> K-mount adapter, the genuine Pentax adapter supports infinity focus)
ZEISS Distagon T* 2,8/25
ZEISS Distagon T* 2/28
ZEISS Distagon T* 2/35
ZEISS Planar T* 1.4/50
ZEISS Planar T* 1.4/85

Zhong Yi Optics
Primes
Mitakon 20mm f/2 4.5x Super Macro
Mitakon Creator 35mm f/2
Mitakon 85mm F1.2
Mitakon 85mm F2
Mitakon Creator 85mm f/2.8 1-5x Super Macro
Mitakon Creator 135mm f/2.8 version II
Mitakon Speedmaster 135mm F1.4


Lensbaby (as long as stock is available, K-mount discontinued in 2019)
Primes
Burnside 35 (with variable vignetting)
Velvet 28
Sol 45
Velvet 56
Twist 60
Velvet 85
Optic Swap System


Dongzheng Optics
Primes
Kerlee 35 mm f/1.2 (info)

Lomography
Primes
Naiad 15mm F3.5 Art (135° FOV, 1cm close focusing)
Lomogon 2.5/32 Art Lens
Daguerreotype Achromat 64mm f/2.9 Art (info)
Neptune Convertible Art Lens System

Kenko
Primes
Kenko 400mm f/8 N II S (via T-mount adapter)

KMZ (sometimes difficult to buy outside Russia; some are easily available though)
Primes
MC Zenitar-K 16mm f/2.8 (fisheye)

MC Helios 77K-4 50mm f/1.8
MC Zenitar-K 50mm f/1.9
MC Zenitar-K 50mm f/2
MC Helios 44K-4 58mm f/2

MC Apo Telezenitar-K 135mm f/2.8
MC Apo Telezenitar-K 300mm f/4.5

Zooms
MC Variozenitar-K 25-45mm f/2.8-3.5

[Class A]

I'm not so sure I'm sad that net SE were liquidated.

I removed the qualifier.

Sad to hear that they were such crooks.

[lytrytyr]

which are the currently available FF lenses (in current catalogues of lens manufacturers) that can be used with the K-1?

Here's a link for the current Zeiss Classic lenses in ZS screwmount (M42 mount, 45.5mm registration distance).
Disregard the M42 lenses with the shorter (26.8mm) registration distance:

ZEISS Classic Lenses | Automated Imaging

[Class A]

Here's a link for the current Zeiss Classic lenses in ZS screwmount (M42 mount, 45.5mm registration distance).
Disregard the M42 lenses with the shorter (26.8mm) registration distance:

Thanks a lot!

I've added the five lenses with the correct 45.4mm registration distance.

[house]

Nice list. It's quite strange how difficult it is to figure out what lenses are available. Would have been nice to indicate auto focus but I realize it's extra work.

[Mistral75]

Nice list. It's quite strange how difficult it is to figure out what lenses are available. Would have been nice to indicate auto focus but I realize it's extra work.

That's easy: only the Pentax, Sigma and Tamron lenses are autofocus lenses.

What would need more work is to distinguish between A and non-A lenses.

[Heebie]

TamronZooms

28-300mm f/3.5-6.3 XR Di LD Aspherical Macro

I don't believe this lens is currently in manufacture.

(and oddly, I own all 5 of the Tamron lenses listed, including this one.)

[Mistral75]

I don't believe this lens is currently in manufacture.

(and oddly, I own all 5 of the Tamron lenses listed, including this one.)

According to Tamron Europe there are only two 24x36 Tamron lenses available with Pentax K mount, not five:

• SP AF 28-75mm f/2.8 XR Di LD Aspherical [IF] Macro and
• AF 70-300mm f/4-5.6 Di LD Macro 1:2

The AF 28-300mm f/3.5-6.3 XR Di LD Aspherical Macro, SP AF 70-200mm f/2.8 Di LD Macro and SP AF 90mm f/2.8 Di Macro are discontinued in any and all mounts and nowhere to be seen.

[Class A]

I don't believe this lens is currently in manufacture.

According to Tamron Europe there are only two 24x36 Tamron lenses available with Pentax K mount, not five:

Thanks heaps.

I removed the following:

SP AF 70-200mm f/2.8 Di LD Macro
AF 28-300mm f/3.5-6.3 XR Di LD Aspherical Macro
SP AF 90mm f/2.8 Di Macro

[Heebie]

I removed the following:SP AF 70-200mm f/2.8 Di LD MacroAF 28-300mm f/3.5-6.3 XR Di LD Aspherical MacroSP AF 90mm f/2.8 Di Macro

Sad. The 90mm is a recent one for me, and it seems really nice thus far! The 70-200 f2.8 is a lens I tend to use often if I'm carrying gear around. (I have the mediocrely-reviewed 28-300 in case I want to NOT carry around lots of lenses, but still want some control... although I think some of the review might exaggerate how "bad" it is.... it's not amazing, but it's still a more useful lens than my phone or my point & shoot.)

Thanks for maintaining this list, BTW! It's useful to know about these things. It appears that Sigma and Tamron are pretty much abandoning us Pentaxians nowadays. I wonder if Tamron will go back to it's "adaptall" mounts at some point.
Fortunately, there's a lot of available used glass, as long as you don't mind manual focus!

[Class A]

Sad. The 90mm is a recent one for me, and it seems really nice thus far!

Yes, even though there are great alternatives to the Tamron 90mm macro, the loss of choice doesn't feel good.
In other words, I don't think there is a lens availability problem for Pentax but that so many third-party options have disappeared over the years (Cosina & Zeiss discontinuing the K-mount and Sigma not releasing most of their Art, Sport, Contemporary lenses go back quite a while now) isn't encouraging.

Let's hope there is an upside in that Ricoh is earning a bit more through Pentax lens sales as if they would with more competition.

I wonder if Tamron will go back to it's "adaptall" mounts at some point.

Doesn't seem likely to me.
Adapters are not without their problems.

Sigma has an approach that is almost as flexible for a user: They offer a "mount exchange" service. Since they are offering the same lenses in multiple mounts, they offer to swap the mount on a lens copy for another one so that it can be used on a different system. That doesn't allow a user to use the same lens across multiple of their systems but at least changing systems doesn't come with nearly the penalty as it usually does.

Fortunately, there's a lot of available used glass, as long as you don't mind manual focus!

Yes, definitely, and even among AF lenses there is quite a bit of choice.
If one includes the used market, then there are even more options.

[Mistral75]

One more and at least five to come:

(New K-mount lenses) The return of the revenge: Meyer Optik Görlitz by OPC Optics - PentaxForums.com

[BarneyL]

Schneider PC-TS lenses have been discontinued for quite a while.

Laowa 100mm 2x Apo Macro didn't get K-mount version.

[Mistral75]

(...)

Laowa 100mm 2x Apo Macro didn't get K-mount version.

Indeed, this lens is only available in Canon EF, Nikon F and mirrorless mounts (Canon R, Nikon Z and Sony E).

Laowa 100mm f/2.8 2x Ultra Macro APO – LAOWA Camera Lenses

[Class A]

Laowa 100mm 2x Apo Macro didn't get K-mount version.

Thanks!

I removed the entry.

[Class A]

One more and at least five to come:

Thanks a lot.

I entered the lens and left the previous Meyer Optik Görlitz models in grey for now.
Please let me know if there is a better way of representing the current situation.
I could, for instance, remove all the old versions (that are now in grey).