Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-06-2017, 12:16 PM   #1
Pentaxian




Join Date: Nov 2007
Location: Western Canada
Posts: 4,206
Pentax 31mm or Pentax 24-70mm ?

I'm thinking of getting a new lens for my K1. The choice boils down to the 31mm Limited..F 1'9 if memory serves me or the Pentax 24-70 F 2.8, which I understand to be a rebadged Tamron.

They're close in price and of course one is a prime, the other a zoom.

I like my photos to be as sharp as they can, I like a solid, well built robust lens.

I find zoom of course more flexible, but I'm ok with a prime. I've got both zooms and primes and I'm ok with both.

I do have a Pentax 28-105 zoom and I must admit this is one heckuva lens. Sharp, food focal length range. It's plasticky, but seems ok build wise.

I also have a 40 Ltd. 70 Ltd. , 50 macro, 50 normal (f 1.4) as well as other mostly ASP-C lenses. I know the 40 and 70 are ASP-C, but they seem to work well with the K-1...the 21 mm not so much, my 10-17 Fisheye..only at 17mm. I have the 18-135, 55-300...asp-c only, also the 150-500 Sigma...full frame.

I take pix mostly of vintage cars, trucks, motorcycles, landscapes, interior shots of people (mostly relatives and friends)....birthdays, Xmas, etc...that kind of event.

Please jump in and provide advice as to what things I should consider, your experiences , etc...

Thanks in advance,

Les

12-06-2017, 12:28 PM   #2
Site Supporter
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,884
Except for f/2.8 the 28-105 covers the 24-70 range. Mostly, unless you need wider than 28mm. Which the 31mm is not going to help with either.

Generally I prefer a good zoom over a bunch of primes and only use primes for special purposes. But in this case I would think about the 31mm instead of the 24-70. Unless you need the 24mm of course.
12-06-2017, 12:58 PM   #3
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 10,328
Everything I read says the 28-105 is excellent and the 24-70 mainly has benefits in speed and wide angle. The post above is spot on. But how about looking at the 15-30? That would be an excellent indoor lens with more flexibility than the FA 31 for your needs.

It's big and heavy. But hey - the 28-105 is light right? LOL
12-06-2017, 01:12 PM   #4
Site Supporter
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,884
QuoteOriginally posted by UncleVanya Quote
how about looking at the 15-30? That would be an excellent indoor lens with more flexibility than the FA 31 for your needs.
Good point. I would love to have the 31mm and maybe someday I will but I cannot justify the cost when other lenses provide more flexibility.

QuoteOriginally posted by lesmore49 Quote
choice boils down to the 31mm Limited..F 1'9 if memory serves me or the Pentax 24-70 F 2.8
Since you already have the 28-105 what are you trying to do that the 24-70 or 31mm will do? You have the range well covered already. UncleVanya's suggestion of the 15-30 has a lot of merit. If you want the 31mm just because it is the 31mm Limited then sure, go for it. But if you are trying to fill out your lens bag I would look for what else I was missing.

12-06-2017, 01:26 PM   #5
Site Supporter
Site Supporter
Sandy Hancock's Avatar

Join Date: Feb 2012
Location: Adelaide Hills, South Australia
Photos: Gallery | Albums
Posts: 5,857
I would get the FA31 - it is ideal for the indoor stuff you mention and is also a very capable landscape lens. Since I got the DFA28-105 I have barely used my DFA24-70. I will most likely sell the latter.

I agree that the DFA15-30 is another consideration. It's a fabulous, versatile lens and Pentax's only weather sealed option in that range.
12-06-2017, 01:29 PM   #6
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 10,328
QuoteOriginally posted by Sandy Hancock Quote
I would get the FA31 - it is ideal for the indoor stuff you mention and is also a very capable landscape lens. Since I got the DFA28-105 I have barely used my DFA24-70. I will most likely sell the latter.

I agree that the DFA15-30 is another consideration. It's a fabulous, versatile lens and Pentax's only weather sealed option in that range.
Sandy - that's high praise for the 28-105 - good to know. Since you own both the FA 31 and the 15-30 along with a K-1 maybe you can give insight where one is better than the other?
12-06-2017, 01:31 PM   #7
Pentaxian
robjmitchell's Avatar

Join Date: Oct 2007
Location: Melbourne Aus
Posts: 1,176
Between the 28-105 and your primes you have most ranges covered. I would go the 31ltd out of the two but the 15-30 should certainly be under consideration if you dont mind the weight. Of course if your patient and prefer primes they there will be a FF wide angle eventually. Probably 2019 at the earliest.
12-06-2017, 01:39 PM   #8
Pentaxian
Na Horuk's Avatar

Join Date: Feb 2012
Location: Slovenia, probably
Photos: Gallery | Albums
Posts: 11,010
QuoteOriginally posted by lesmore49 Quote
I do have a Pentax 28-105 zoom and I must admit this is one heckuva lens. Sharp, food focal length range. It's plasticky, but seems ok build wise.
Sell the 28-105mm, sell the DA 40mm, and buy both FA 31mm and 24-70mm. That way you have a fresh new kit. Later get one of the ultra wides, maybe a 70-200mm if you prefer telephoto, and you're done!

From your post, OP, I get the vibes that you ultimately want a number of sharp primes rather than superzooms. Go down that path, primes are becoming popular again

12-06-2017, 01:41 PM   #9
Veteran Member




Join Date: Dec 2016
Posts: 497
Like Sandy, I would go for the FA 31mm f/1.8 Limited, unless you really need a faster zoom lens. It is a fast lens good for low-light situations, and it is even sharp wide open. It offers wide angle without being overly wide, which makes it very versatile for FF use. Its other imaging characteristics are stellar as well. It is much faster and even better for low light than an f/2.8 lens.

I have fast f/2.8 zoom lenses, but I only use them when I need that speed. Otherwise, I use my slower-but-excellent alternatives because unless needed, who needs to haul the weight? I also have some faster primes, including some Limiteds, and they are a joy to use, easy to carry, and can be there for situations where that extra speed is needed.

Last edited by mikesbike; 12-06-2017 at 01:50 PM.
12-06-2017, 01:52 PM - 1 Like   #10
Site Supporter
Site Supporter
Sandy Hancock's Avatar

Join Date: Feb 2012
Location: Adelaide Hills, South Australia
Photos: Gallery | Albums
Posts: 5,857
QuoteOriginally posted by UncleVanya Quote
Maybe you can give insight where one is better than the other?
Most of it is obvious from the specs. I would not be without either, and often pack them both for a day out. The photos below are all from the same trip.

The FA31 is much faster, much smaller, takes regular 58mm filters and is chock full of pixie dust.





The DFA15-30 gives you the versatility of zooming to the ultra-wide end and adds WR and silent focus when those features are important.



12-06-2017, 01:52 PM   #11
Junior Member




Join Date: Jul 2012
Location: Canberra
Photos: Gallery
Posts: 35
I've got (and use) both. When you can zoom with your feet, use the 31mm. When you can't - use the zoom.
12-06-2017, 01:54 PM   #12
Site Supporter
Site Supporter
pschlute's Avatar

Join Date: Mar 2007
Location: Surrey, UK
Photos: Gallery
Posts: 1,429
Given what you have go for the 31mm f1.8 LTD. Many regard it as the finest lens Pentax ever made.

The 24-70 2.8 is a very fine lens which I like a lot. But it will duplicate your 28-105 with only 4mm of extra wide.

The 31mm Ltd has a quality that is difficult to describe. it is sharp even at 1.8, but stop down to f4 and it is astonishing. But that is not what makes the lens , the way it transitions to oof areas is what makes this lens special to me. It is is old technology though so that means screw drive AF which is fine by me. Also it will display chromatic aberation quite significantly if photographing against a bright sky, so be prepared to do some PP work. It has a built in hood which sometimes does not give the protection you may require.

However it is a classic and as a confirmed Pentaxian you will get one one day so why not now !
12-06-2017, 02:13 PM   #13
Site Supporter
Site Supporter




Join Date: Nov 2009
Location: Michigan
Photos: Gallery
Posts: 314
Wide for Landscapes

I have the 24-70 and the 28-105. I'll take the 28-105 when I need to travel small / light, but I prefer the 24-70 in most cases. It has the wider aperture which is nice for a number of reasons and for landscapes 24 is quite a bit wider than 28. When I review the focal lengths of my landscape shots many are at 24, indicating that I really needed the extra 4 mm. It seems that you don't have any FF lens that wide so the 24-70 would fill that void.
12-06-2017, 02:28 PM   #14
Pentaxian
IgorZ's Avatar

Join Date: Aug 2015
Location: Ottawa
Posts: 899
QuoteOriginally posted by Sandy Hancock Quote
Most of it is obvious from the specs. I would not be without either, and often pack them both for a day out. The photos below are all from the same trip.

The FA31 is much faster, much smaller, takes regular 58mm filters and is chock full of pixie dust.
some very nice photos!
12-06-2017, 02:55 PM   #15
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 3,401
QuoteOriginally posted by lesmore49:
Pentax 31mm or Pentax 24-70mm ? ... I do have a Pentax 28-105 zoom and I must admit this is one heckuva lens ... I take pix mostly of vintage cars, trucks, motorcycles, landscapes, interior shots of people ... [snipped for brevity]
I think the FA 31 is better than the 24-70 for you. My reasoning follows.

What about the 28-105 do you want to upgrade? Better low light, thinner depth of field, or something else? I suspect 28mm is already wide enough for you or else you wouldn't be considering the FA 31. Therefore, buy the FA 31. It gives you sharpness, low light flexibility, thin depth of field when needed. It's a more distinctive lens than the 24-70. Your 28-105 already covers zoom, weather resistance, silent focus, quickshift focus so the 24-70 doesn't seem to add any special features for you.

Personally, I would do as others suggested and get the 15-30. Thta's because I like wide angle and find that even 24mm is not wide enough indoors and for close-ups of cars. If your 28-105 gets you wide enough, though, you'll probably love the FA 31.
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!
31mm, 31mm or pentax, asp-c, course, k-mount, lens, ltd, pentax, pentax 24-70mm, pentax 31mm, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax DFA 24-70mm or Sigma 24-70mm f2.8? David L Pentax SLR Lens Discussion 11 03-31-2016 12:36 AM
Fotodiox 24" x 24" Softbox for $24.95 on Amazon geekette Flashes, Lighting, and Studio 2 06-30-2011 05:30 PM
Sigma 24-70mm F2.8 IF EX DG HSM - VS - Sigma 24-70mm F2.8 EX DG Macro Braciola Pentax SLR Lens Discussion 2 10-15-2010 04:54 AM
Traveling 17-70mm vs 24-70mm vs 24-75mm Madhatter_ Pentax SLR Lens Discussion 8 07-28-2010 04:48 PM
What different between SMC K 24/2.8, SMC K 24/3.5 and Takumar SMC 24/3.5 mdmitriy Pentax SLR Lens Discussion 7 07-18-2009 02:02 PM



All times are GMT -7. The time now is 01:52 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