[pinholecam]

Samyang 14/2.8 - Its good (if you get a good copy). Its stunning in fact given the price of it vs any other thing in this FL.
Distortion correction profile is available for LR from what other folks have created, so correction is a click away.
Better on K1 than A7 (and mine's a modded A7 even)


Pentax K1 with the Samyang 14/2.8



K1+Samyang 14/2.8
Full size on my Flickr



M20/4



Even though this is 36mp, the M20 does go thru this relatively ok (all things considered).
Far edges and corners are not that great, but like I said, I am rather forgiving on this given the size and joy of using this lens.
In fact, very surprised that at 36mp vs the 24mp of my A7k, the overall IQ is not degraded with the higher pixel density.
Best used with a 4:3 aspect ratio in mind if one is picky about extreme edges.


Not the most razor sharp as most pancakes are like this, but imo certainly better than the faster 20,24mm options imo which have a more uneven sharpness profile, being more center sharp than the off center.

[fwcetus]

I just bought a F28/2.8, which is the highest rating 28mm lens in the PF review database.

Well, er, no. The K 28/2, K 28/3.5, M 28/2, M 28/3.5, A 28/2, F 28/2.8 all score higher. [This is not too say that the FA 28/2.8 is not a very good lens.]

[Sandy Hancock]

Well, er, no. The K 28/2, K 28/3.5, M 28/2, M 28/3.5, A 28/2, F 28/2.8 all score higher. [This is not too say that the FA 28/2.8 is not a very good lens.]

Well I *was* talking about the F28, not the FA28 as you seem to have assumed

I'm too lazy to record the aperture I shoot at, so I didn't check anything older than the A series....

[Ginnipe]

I'm currently running some tests on it, but so far the Samyang / Rokinon 14mm is performing very well! its manual focus only, but its also very high quality for only like $300. Worth checking out!

[Schraubstock]

What quality of images do you all imagine we will get (FF) with our Pentax 12 to 24mm lenses. Will it work well or much it be cropped?

The sigma 12-24 DG EX is doing just fine on the K-1. Both shot at 4.5 and 5.6 respectively. If you don't want your toes in the picture I would say 12mm on a FF cam would probably be as wide as you want.
Here are two quick samples.

[cmohr]

Yes, another vote for the Sigma 12-24, great to have a camera that uses it the way it should be. I also have the Sigma 15-30, I like it, Sigma 8mm circular fisheye, cool on the K-1

[edo]

The Pentax 17-28mm fisheye is excellent all the way on k1. Truly a joy to use!
Best wide angle fisheye for k1.

---------- Post added 05-10-16 at 11:15 AM ----------

And tokina 17mm f3.5 is just excellent except for far corner performance regarding chroma and sharpness. Buy if you shot UWA zooms you would expect that too.
Easy to correct in post.

fA20-35 is a superb lens as already said just you would have problem finding one now.

[fwcetus]

Well I *was* talking about the F28, not the FA28 as you seem to have assumed

Oops -- you are quite correct about my mis-assumption.

I'm too lazy to record the aperture I shoot at, so I didn't check anything older than the A series....

I understand. While I personally do love the optics of some of the K lenses especially (and I do own a few excellent K primes - K 28/2, K 28/3.5, K 55/1.8), I also value the metering convenience of A lenses, too, and own a few of them (primes - A 50/1.4, A 50/2.8 Macro - and zooms - A 28-135/4, A 35-105/3.5, A 70-210/4), too. [I currently have no M lenses.]

[funkathustra]

What quality of images do you all imagine we will get (FF) with our Pentax 12 to 24mm lenses. Will it work well or much it be cropped? RJM

The Pentax 12-24 is not a full-frame lens, so you'll have to crop the images down to APS-C. The K-1 only has 15 megapixels covering an APS-C frame, but it's not like the 12-24 maxes out even the Pentax K-10D 10 megapixel sensor, so I doubt you'd pull any more detail from this lens on a high-res APS-C body like the 24 MP K-3 when compared to a 15 MP crop-mode K-1.

---------- Post added 05-10-16 at 05:14 PM ----------

The sigma 12-24 DG EX is doing just fine on the K-1.

I couldn't imagine how. The Sigma is OK in the middle (around 18mm), but it's pretty soft wide-open at 12mm (better at f/8), and basically unusable at 24mm. DxOMark doesn't see the lens ever pull more than 8-10 megapixels of detail, so it seems pretty silly to me, especially given the cost.

But! Having said that, sometimes you really, really need 12mm, and the Sigma is the only way you'll get it. And you can't fault them for the low-quality resolution figures; it's extremely challenging to make a UWA lens of that sort of focal length. And to make it a zoom, too? Eeek. Either way, I wouldn't consider the 12-24 as a general-purpose wide-angle lens. I think for day-to-day work, stuff in the 15-24 MP range is going to be more useful.

---------- Post added 05-10-16 at 05:25 PM ----------

Samyang 14/2.8 - Its good (if you get a good copy). Its stunning in fact given the price of it vs any other thing in this FL.

Yeah, this is definitely the route I'd go if I needed an extreme UWA lens. Manual-focus doesn't bother me in this case, just given the DoF you generally aim for, and the fact that your subjects are generally moving pretty slowly across the frame when you're shooting this wide.

M20/4

I downloaded the largest size of this image on Flickr and was pretty impressed with the resolution of the image. Overall, I've been disappointed with older film glass mounted on my K-3 — while the longer lenses are fun for portraiture, a lot of the glass is absolutely shitty in terms of resolution. I'm not saying the M20/4 is one such example, but the much lower-density FF sensor will definitely give these lenses a lot more breathing room.

[pinholecam]

I downloaded the largest size of this image on Flickr and was pretty impressed with the resolution of the image. Overall, I've been disappointed with older film glass mounted on my K-3 — while the longer lenses are fun for portraiture, a lot of the glass is absolutely shitty in terms of resolution. I'm not saying the M20/4 is one such example, but the much lower-density FF sensor will definitely give these lenses a lot more breathing room.

The M20/4 is a compromise lens, though not bitingly sharp, its good enough and there will be times when I think good enough is enough considering its super portability and nice characteristics like decent flare resistance.
My own thoughts is that though it can be better off on a lower res sensor, I don't need 36mp at all and I'm working towards a downsampled workflow of 5120p or 6114p.
The final test of this will be printing A3/A3+ on my printer, but it will be a while since I need to get something I'd like to print first.

I do think newer wides is the way to go for digital and 36mp FF for edge to edge sharpness.
Thats what Pentax themselves mentioned in the special site talking about development.
However, there are some surprises when an old wide prime can be better than some of the UWA zooms out there (esp the pre-2014 UWA like Canon 17-40/4L; 16-35/2.8 v1; Sigma 12-24v1 ).


There is a dilemma here with the K1 and wides when ultimate edge to edge IQ is required.
Its the same as any other brand.
The solution is very big and heavy lenses and portability takes a hit.

[Sandy Hancock]

The FA20/2.8 isn't too shabby in the corners at f/4
I don't mind the bokeh either.

[i5_david]

Got a Sigma 12-24 DG. This is wide

Has anyone else this lens? As far as I see it, its pretty rare out there!?!?
Until now this is my UWA solution.

But somehow some shots are incredible sharp and others are absolutely not. Haven't figured out why?
Is there a kinda trick for UWA and sharpness which I haven't heard yet? appreciate any advice.

[infoomatic]

this is from the M20/4. with crops each. By the way: the reflecting star (which I really like, its similar to my DA 15mm ltd.) is the Red Bull headquarters in Fuschl, Austria.

[Bernard Yeo]

I recently added a FA 28mm f2.8 to my setup ... I thought it's value for the money spent.



K1 + FA28 (Multi-row pano image)


Along with the FA 35mm ... I am beginning to think how many more of these Pentax film days' lenses rocks with this incredible FF camera of ours.



K1 + FA35 (Multiple-exposure)


Not ultra-wides, but wides nevertheless ...

[funkathustra]

K1 + FA28 (Multi-row pano image)

Really cool photo — however, I don't think stitched photos are useful to post in this thread, as they greatly exaggerate the FOV and resolving capability of the optic in question. You could shoot that same photo with an FA* 85, a cheapo Quantaray zoom, or really any other lens, and it'd look the same.

You can't really show me that picture and say, "this is what the FA28 looks like"

I'd recommend people only post single-exposure pictures, just so that newer readers don't get confused, especially since so many people are used to an "APS-C mindset"