Top 10 Best Third Party Pentax Fit Lenses 2018

Here are the 10 top Pentax K-Mount third-party lenses we've put to the test.

08/02/2018 - 11:15

Pentax K-1


If you're a Pentax camera owner who has some cash to splash on a new lens, our top ten list of Pentax K-Mount third-party lenses should make it a little easier for you to decide which lens to buy. 

Third-party lenses are simply ones that aren't made by the same company that made your camera but when purchased in the correct mount, will fit your camera of choice. So, the ten lenses listed here will fit the full line-up of Pentax DSLRs, including the Pentax KP, Pentax K-70 and Pentax K-1

As well as third-party lenses, we've also got a guide to the best 26 Pentax lenses you can buy to date and a feature which looks at the range of lenses available for the Pentax K-1 so you can make a more informed choice when purchasing a new lens. 

If you don't see your favourite lens here that's probably because we've not reviewed it for it didn't score high enough to make the top ten but please do add your comments below on lenses you'd like us to review and we'll do our best to oblige. 


1. Venus Laowa 12mm f/2.8 - 

Venus Laowa 12mm f/2.8 Zero-D Ultra

The Venus Laowa 12mm f/2.8 is a unique lens that's well made, with extraordinary performance. There are those who will struggle with the manual focus, but there are solutions to this with various techniques. There's no doubt that the lens performs exactly as claimed and should give excellent service for a very long time. The Laowa 12mm f/2.8 is a unique ultra-wide lens that delivers its promise of high quality and minimal distortion.

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2. Irix 15mm f/2.4 - 

Irix 15mm f/2.4


The Irix 15mm f/2.4 lens is a powerful photographic tool. This lens from Irix lifts the performance for such lenses way beyond the first early 1970s offerings and gives us a lens that is free from flare, and very sharp. This Swiss design is an excellent one, built in Korea to very high standards. Overall, the Irix 15mm f/2.4 is a beautifully engineered lens that produces beautiful images. 

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3. Irix 11mm f/4 Firefly 

Irix 11mm f/4 Firefly


What an exciting lens the Irix 11mm f/4 Firefly is. It opens up a whole new world of creative possibilities in a well-made, well-designed package that delivers the image quality. It will not be for everybody, perhaps because of the ultra-wide style of the images, or maybe because of difficulties using the manual focus system, but if the lens appeals to the individual photographer's creativity then it will be a rewarding experience. The Irix 11mm f/4 Firefly is the widest ultra-wide rectilinear lens, full of exciting creative possibilities.

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4. Samyang (Rokinon) 20mm f/1.8 ED AS UMC - 

Samyang (Rokinon) 20mm f/1.8 ED AS UMC


20mm lenses are very attractive for the wide angle photographer, wide enough to be interesting, but not so wide as to be very difficult to handle. We have here a lens that is well made, has a very high standard of performance, and a reasonable price tag. Without a doubt, the Samyang 20mm f/1.8 ED AS UMC adds up to being a very good deal.

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5. Laowa 105mm f/2 T3.2 Smooth Trans Focus - 

Laowa 105mm f/2 T3.2


Laowa certainly knows how to make exciting and different lenses. It's always good to see lenses that go beyond the pure technicalities, offering some unique “feel” or “character” to images. The Apodization filter is very clever, it works and the bokeh offered is indeed superb, whilst the sharpness of the main subject is not compromised in the slightest.

Despite some handling inconvenience, the Laowa 105mm f/2 T3.2 is fun to use and a challenge to become proficient with. It may not be for everyone, but for those willing to get to grips with it the reward will be in that sublime, creamy smooth bokeh.

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6. Samyang 135mm f/2 ED UMC - 

Samyang 135mm f/2 ED UMC

Those interested in a fast 135mm, who are either on a budget or don’t need autofocus for their work, should certainly consider this lens. It’s more than capable of delivering sharpness on a par with high-end lenses, but at a fraction of the cost. This, coupled with the excellent build quality and smooth manual focus action make the Samyang 135mm f/2 ED UMC lens an excellent buy overall.

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7. Samyang 12mm f/2.8 ED AS NCS Fish-eye - 

Samyang 12 MM F2.8 lens for PENTAX-K


At face value, this 12mm fisheye lens from Samyang would be good value if it was only half-decent, due to the low price and excellent build quality. The fact it is capable of producing images with outstanding sharpness and offers a unique stereographic projection means that this lens should be high on the wishlist of anyone looking for a diagonal fisheye for their full-frame DSLR.

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8. Sigma 18-300mm f/3.5-6.3 Macro OS HSM C - 

Sigma 18-300mm f/3.5-6.3 Macro OS HSM C


This lens is certainly capable of delivering images with decent sharpness. It is reasonably compact, well built and the price is very reasonable too. Those looking for a lens covering a wide range of focal lengths, whilst allowing them to travel light should certainly give this lens serious consideration. The Sigma 18-300mm f/3.5-6.3 Macro OS HSM C is capable of delivering images with decent sharpness and is reasonably priced.

Buy On Amazon UK | Buy On Amazon USA 



9. Laowa 15mm f/4 1:1 Macro - 

Laowa 15mm f/4 1:1 Macro

This is a very versatile lens with some unique features for the focal length. It has commendably high central sharpness and very low levels of CA. Distortion and vignetting are high and edge sharpness suffers. In the right hands, the Laowa 15mm f/4 should produce some excellent dramatic images, all at a fairly modest price level. Performance is better on APS-C format cameras. The Laowa 15mm f/4 1:1 lens is a versatile optic offering unique features for an ultra-wide.

Buy On Amazon UK | Buy On Amazon USA 


10. Samyang 8mm f/3.5 UMC Fish-Eye CS II - 

Samyang 8mm f/3.5 UMC Fish-eye CS II Lens

Even if you discount the fact that this 8mm fisheye is a high-quality lens, available for under half the price of equivalents from other manufacturers, this is a very interesting lens. It is capable of producing images with excellent sharpness, the build quality is good, and the removable hood adds extra flexibility, allowing the lens to be used as a partial circular fisheye on full frame cameras. Even the lack of autofocus shouldn’t put you off this lens, as the depth of field available with a fisheye, makes focusing manually incredibly easy.

Buy On Amazon UK | Buy On Amazon USA 


Want to see more top lists? Take a look at our 'Best Gear' section of the site. 

Related Photos
No related photos found. Check out the Pentax User Gallery.


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Laowa 105mm is just insane. That quality for that price? Great value for money!


Link Posted 12/02/2018 - 20:35
I love Irix


Link Posted 15/02/2018 - 12:18
Irix f4 firefly is sent from a god. What a device. I love it!


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Link Posted 21/02/2018 - 11:53
Samyang 135mm f/2 ED UMC my favourite


Link Posted 19/03/2018 - 11:18
I really love Samyang 1355mm f/2 ED UMC as well. There's something about it.!


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Link Posted 25/03/2018 - 19:58
Those are really amazing. I wish I could afford one.


Link Posted 01/04/2018 - 17:30
"The Irix 11mm f/4 Firefly is the widest ultra-wide rectilinear lens,.."

That's news - my Sigma 8-16mm must just be a dream. Nice dream though, it's very sharp across the field. Or i imagine it is.

I haven't tried the Sigma 10-20mm so that one might be real.


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i own the Sammy 8mm 3.5- it is a very nice manual lens, dramatic and sharp, great value for the money- now if they would just start making good AF lenses with that great glass they use that would be win win win- aloha


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