Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-01-2017, 09:18 PM   #1
Site Supporter
Site Supporter
Ric's Avatar

Join Date: Dec 2011
Posts: 131
Pentax A 24mm 2.8 vs Sigma 24mm 2.8

I am comparing the Pentax A 24mm 2.8 with the Sigma 24mm 2.8 Super Wide. I read the reviews on this forum for each. My post is for the purpose of seeking information on a comparison between the two. Is the Sigma just as compatible with my K-5 for example and what are the strengths and weaknesses of each lens.
I saw both on ebay as I am interested in a wide angle lens. I really want the the FA 20 2.8 but cannot seem to find one for what I can pay for it. Next the A 20 is not coming up very often either so I'm moving down the list to the 24mm.
Thanks.

03-01-2017, 11:51 PM - 1 Like   #2
Pentaxian
calsan's Avatar

Join Date: Nov 2008
Location: Perth, Australia
Photos: Gallery
Posts: 1,464
Maybe reveal what your acceptable budget is - the forums may have some options if they know....
03-02-2017, 12:08 AM   #3
Pentaxian
arnold's Avatar

Join Date: Aug 2012
Location: Queensland
Photos: Gallery | Albums
Posts: 3,857
I have both, but the Pentax is the K version. The K 24mm was from a swap meet, and I don't think it is quite right as it flares terribly. Because it may have suffered unknown unobserved damage, I will reserve judgment on it. The Sigma Super-wide is superb as well as having auto focus. It sits on my K1, and I did show some of its results on the K1 photo thread.
03-02-2017, 02:00 AM   #4
Pentaxian




Join Date: Jul 2010
Location: Oregon
Photos: Albums
Posts: 1,427
There was a shootout online the compared 24mm lens converted to use on Canon. The Sigma made it farther than the Pentax. I have one of the manual focus Sigma's 24/2.8. It is a decent lens. The color is different than Pentax, but that can be tweaked in PP.

---------- Post added 03-02-17 at 01:04 AM ----------

Photozone test of the Sigma: http://www.photozone.de/pentax/144-sigma-af-24mm-f28-macro-pentax-k-photozone-review--lab-test-report


Last edited by civiletti; 03-02-2017 at 02:01 AM. Reason: sp
03-02-2017, 06:25 AM   #5
Forum Member




Join Date: Feb 2014
Posts: 90
QuoteOriginally posted by Ric Quote
I am comparing the Pentax A 24mm 2.8 with the Sigma 24mm 2.8 Super Wide. I read the reviews on this forum for each. My post is for the purpose of seeking information on a comparison between the two. Is the Sigma just as compatible with my K-5 for example and what are the strengths and weaknesses of each lens.
I saw both on ebay as I am interested in a wide angle lens. I really want the the FA 20 2.8 but cannot seem to find one for what I can pay for it. Next the A 20 is not coming up very often either so I'm moving down the list to the 24mm.
Thanks.
I suffered from a LBA attack and bought a Pentax A 24 f/2.8. The lens had a 9+ rating, it was clean, no scratch or damage, and mechanically perfect. I was initially quite excited; however, I was not happy about the IQ. It was weak in terms of resolution compared to Sigma 17-50 @ 24mm. The only good thing I can say is that extreme corners were sharper and less distorted than the zoom. I no longer have the lens.
03-02-2017, 08:31 AM   #6
Pentaxian




Join Date: Apr 2016
Posts: 505
The SWii was one of my favourite lenses because of the sharpness and contrast that it provided. I stopped using it but always had it in my bag. The A 24mm seems like a nice lens but I've not had the time to give it a real shot.
03-02-2017, 09:21 AM   #7
Pentaxian
ChristianRock's Avatar

Join Date: Jul 2013
Location: Woodstock, GA
Photos: Gallery | Albums
Posts: 7,560
I would still like to try the Superwide II at some point... but I'm not too crazy about the colors one gets from it, so I've passed on one a couple times when I could have got it.

The ones I have had are an early Tokina design branded as Rokinon MC 24 2.8, a Pentax-K 24 2.8 (same optics as the A version, but I think the A has updated coatings), and the Cosina 24 2.8 (branded Vivitar).

The Rokinon/Tokina I had, had some flaws that made me think something was lose on the inside. Blurry (and I mean really blurry) up to f5.6, unless you were around MFD, where it wasn't sharp but at least not blurry. At f5.6 it sharpened up ok (not pin sharp but acceptable) and it took PP very well, showing pleasing colors. But not so great SOOC.



The K 24 2.8 is great but it does have some flaws. The one shortcoming I saw was that it isn't quite as sharp at longer distances as it is at shorter ones. Not bad, just not quite as sharp, even stopped down.
Now the positives are to rave about: the colors are absolutely top notch and so well balanced. I think it handily beat the DA 21 Limited (I had the SMC for a short while) on that department. The sharpness for anything less than 20 feet away was, in the copy I had, very good and the microcontrast was lovely. And it's quite flare resistant considering how old it is. So for taking pictures inside, for objects, or for street photography, it's a gem. It's also incredible for sunrises and sunsets. But for landscapes, I'd probably look at something else.



And finally, the Cosina/Vivitar... it's very sharp at infinity, not quite as sharp (but still very useable) at shorter distances. It meters surprisingly well on my K-S1 and as well as can be expected on my K10D (I don't like how the K10D meters, period...) The colors aren't as good as Pentax colors (not bad, just nothing exciting). And it flares quite badly. I'm still looking for a hood that will give me only the APS-C circle for that lens, as it needs all the help it can get. I'm making do with it at the moment until I decide if I want to try the Pentax design again, or maybe finally try the Sigma...
(The K10D sensor helps with the colors here...)


Last edited by ChristianRock; 03-02-2017 at 09:26 AM.
03-02-2017, 01:14 PM   #8
Senior Member




Join Date: Aug 2007
Location: Los Angeles
Photos: Gallery
Posts: 233
Pentax A 24mm vs Sigma superwide II 24mm

I've owned all of the variants at various times. The K and A versions of the Pentax, the autofocus and manual versions of the sigma (A and non A).

Basically, if sharpness is your primary criteria, then go for the Sigma. It is quite sharp wide open. The Pentax really focuses on center sharpness only. If color and contrast are more important to you go for the Pentax, it has great colors whereas the Sigma needs post processing work. The Sigma looks washed out if used wide open and flares quite a bit more than the Pentax.

Optical qualities aside, the autofocus version of the Sigma is a lot bigger. The autofocus is loud and raspy, but fast. (This is not just the one copy I have used, I've owned several). The lettering on the Sigma (all versions) is just printed on and wears off with time. The hood is creaky (although to be fair, finding the original hood for the Pentax is really difficult). The Pentax just has a much better feel in the hand.

They are both good lenses and each has its benefits and drawbacks. I don't believe you'll have any compatibility problems with either lens on the K5. Right now, I think you'll be paying roughly 1/3 to 1/4 the price of a Pentax 20mm.

03-02-2017, 02:57 PM   #9
Pentaxian




Join Date: Jan 2015
Location: mid nth coast,nsw
Photos: Gallery
Posts: 5,261
QuoteOriginally posted by arnold Quote
The Sigma Super-wide is superb as well as having auto focus. It sits on my K1,

Is 24mm wide enough?...the SW Sigma does a good job, first lens that got to have fun on my K1. The Sigma is well worth the U$ 20 that it cost me!
03-03-2017, 07:03 AM - 2 Likes   #10
Pentaxian
TaoMaas's Avatar

Join Date: May 2007
Location: Oklahoma City
Photos: Gallery | Albums
Posts: 3,438
What am I missing? Why are you not considering a used Pentax 21mm?
03-03-2017, 07:57 AM   #11
amateur dirt farmer
Loyal Site Supporter
pepperberry farm's Avatar

Join Date: Dec 2014
Location: probably out in a field somewhere...
Photos: Gallery | Albums
Posts: 22,812
QuoteOriginally posted by TaoMaas Quote
What am I missing? Why are you not considering a used Pentax 21mm?

especially since it'll be used on APS-C and not FF....
03-03-2017, 08:42 AM   #12
Ric
Site Supporter
Site Supporter
Ric's Avatar

Join Date: Dec 2011
Posts: 131
Original Poster
QuoteOriginally posted by pepperberry farm Quote
especially since it'll be used on APS-C and not FF....
I am not considering the DA 21mm since my aim is to get a K1. I'm looking for a full frame wide angle lens. But thanks for the suggestion.
03-03-2017, 09:15 AM   #13
Site Supporter
Site Supporter
luftfluss's Avatar

Join Date: Jun 2011
Location: NJ
Photos: Gallery | Albums
Posts: 7,933
IMO, a significant attribute of the Super Wide is the close-focus ability. It's fun.



I haven't owned the Pentax 24/2.8, but have owned 2 Tak 24/3.5's and a K 24/3.5, in addition to my current Sigma Super Wide II AF and two (sold off) MF versions. In terms of edge-to-edge sharpness, it's SWII AF > SWII MF > K24 > Tak24. For center sharpness, the Sigmas and K24 are similar, the Tak24 lagging. For distance resolution, it's SIgmas > K24 > Tak 24. For rendering, all are good, but different. I particularly like the way the Tak24 renders green foliage on a cloudy day.

I guess the upshot of my rambling is the Super Wide II AF is the best all-around 20-something lens I've used. It's especially excellent for landscapes where edge-to-edge sharpness in important, and close focus. But if you are taking pictures of people, social situations, or things, then personal taste in rendering is more important than edge sharpness, IMO.

Last edited by luftfluss; 03-03-2017 at 09:37 AM.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
24mm, 24mm 2.8 vs, 24mm lens, k-mount, lens, pentax, pentax a 24mm, pentax lens, sigma, slr lens, vs sigma 24mm
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Sigma AF Super-Wide 24mm 2.8, Tamron Adaptall 24mm 2.5 with either PK/A or PK mount. jjdgti Sold Items 10 07-09-2015 11:12 AM
For Sale - Sold: Pentax DA 40 XS, Sigma 30mm F/1.4, 24mm F/1.8, Tamron 10-24mm, 17-50mm F/2.8 devorama Sold Items 11 06-26-2015 05:52 PM
For Sale - Sold: Sigma SuperWide 24mm 2.8 AF, Pentax M 75-150mm 4, CPC Phase 2 28mm 2.8 causey Sold Items 17 04-23-2012 02:13 PM



All times are GMT -7. The time now is 07:24 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top