Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-24-2015, 02:44 PM   #1
Veteran Member




Join Date: Apr 2013
Posts: 313
K3 users - are the limiteds good enough on 24mpix?

I have a K-5 IIs and I am definately ok with the performance of my 15/21/35 limiteds on it. But the 21 is not the sharpest lens ever and the 15 is known for its corner issues.
The 35 is fine on K-5 IIs but recently i saw some pictures taken with it mounted on sony a5100 via adapter and I was somewhat dissapointed with the results (the sony has a 24mpix sensor but I'm not sure if it has AA filter or not) ...

So I was wondering - what is your experience with these lenses on K-3 ? Are they up to the 24 mpix sensor?

02-24-2015, 03:12 PM   #2
Pentaxian
panoguy's Avatar

Join Date: Sep 2007
Location: Washington, D.C.
Photos: Gallery | Albums
Posts: 3,292
QuoteOriginally posted by npc Quote
The 35 is fine on K-5 IIs but recently i saw some pictures taken with it mounted on sony a5100 via adapter
You can stop right there. Any adapter is going to be less precise than the mount made by the original company on a purpose-built camera body. That's a variable that has nothing to do with the lens or the sensor.

FYI: the two lenses you mention that I have (the 15 and 35) are both stellar on the K-3, which is what I experienced on the K-5, as well. 24MP isn't that much more resolution than 16.
02-24-2015, 03:12 PM   #3
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,653
Forget the K3, look at the sample images done with a Q

The equivelent sensor size on an APS-C format would be about 160 MP

I think even old legacy lenses are sharp enough
02-24-2015, 03:14 PM   #4
Site Supporter
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Washington Cascades
Photos: Gallery | Albums
Posts: 11,799
Not sure what you are asking, maybe I'm misunderstanding. But the lens is not going to be any worse than it was on the k-5, though it might be better.

If the limiting factor is the lens and you try it on two different sensors you should not see any difference as both sensors out resolve the lens.
If the limiting factor is the sensor then you should see an improvement on the better sensor as the lens is capable of more resolution than the poorer sensor.

But in no case would the lens look worse on a better sensor.

In the specific case of the k-5IIs and the k-3 they are different sensors. In some situations some have reported that they prefer the k-5IIs though I think in general terms there is no question the k-3 sensor is better. I use both k-5IIs and k-3 with DA limiteds and after allowing for the differences in the sensor characteristics I don't see any significant difference. Which leads me to assume that the DA limiteds out resolve both sensors.

Keep in mind that these cameras use different sensors and you need to develop the images differently. When I first got the k-3 I was unimpressed because I was using the k-5 develop preset. After tossing that out and developing a new preset specifically for the k-3 I am very happy with the k-3 and it produces images at least as good as the k-5IIs but with more pixels.

02-24-2015, 03:25 PM   #5
Dark Underlord
Loyal Site Supporter
AquaDome's Avatar

Join Date: Jan 2014
Location: New Carlisle, IN
Photos: Gallery | Albums
Posts: 1,475
They're awesome on the K-3. The DA15 Ltd is my favorite.
02-24-2015, 03:55 PM - 2 Likes   #6
Pentaxian
tvdtvdtvd's Avatar

Join Date: Jan 2010
Posts: 1,173
Has the originator of the 'camera X will out-resolve that lens Y' argument been found and strung yet?

Learn your camera. Learn your lenses. Love each for what each does. Don't expect either to
be what they're not. Follow that simple mantra and you will enjoy the images produced by any
camera and any lens.
02-24-2015, 03:56 PM   #7
Site Supporter
Site Supporter
Stavri's Avatar

Join Date: Aug 2014
Location: at a Bean & Leaf
Photos: Albums
Posts: 1,752
check out normhead's posting on a comparative graph

https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/289020-why-...ml#post3170854
02-24-2015, 04:33 PM   #8
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 32,670
QuoteOriginally posted by jatrax Quote
...the lens is not going to be any worse than it was on the k-5, though it might be better.
To be honest, it is more likely that a digital sensor will limit a lens than the other way around.


Steve

02-24-2015, 05:00 PM   #9
Site Supporter
Site Supporter




Join Date: Jul 2014
Location: Oakland, CA
Posts: 62
QuoteOriginally posted by jatrax Quote
Keep in mind that these cameras use different sensors and you need to develop the images differently. When I first got the k-3 I was unimpressed because I was using the k-5 develop preset. After tossing that out and developing a new preset specifically for the k-3 I am very happy with the k-3 and it produces images at least as good as the k-5IIs but with more pixels.
I found this exact thing with the 35ltd. I used the develop process from the K-50 on the K-3 and got very different results. Both are great, just different.
02-24-2015, 05:00 PM   #10
Pentaxian
jddwoods's Avatar

Join Date: Nov 2012
Location: Newark, Delaware
Posts: 896
I have used the 15, 21, 35 macro and the 70 limiteds. All are superlative on the K-3. The only one I haven't tried is the DA 40, but I would expect it would be just as good as the others. I have a K-5 and my general impression is the pictures on the K-3 and K-5 look very similar, but the K-3 pictures can be cropped more and still stay sharp.
02-24-2015, 08:58 PM   #11
Pentaxian




Join Date: Sep 2009
Location: Southern California
Photos: Gallery | Albums
Posts: 3,229
QuoteOriginally posted by tvdtvdtvd Quote
Has the originator of the 'camera X will out-resolve that lens Y' argument been found and strung yet?
Agreed (well, maybe mere imprisonment will be adequate).

There's so much more to the quality of a photo. Even when such measurements are made analytically they don't seem to pan out in real life. Especially if you're trying to create photos that capture people's attention.


Perhaps there are scientific applications where this is relevant, but they should generally be buying different cameras anyway.
02-24-2015, 09:21 PM   #12
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,794
QuoteOriginally posted by jatrax Quote
But the lens is not going to be any worse than it was on the k-5, though it might be better.
That is the correct answer to this thread, for any lens, not just the Limiteds.
02-24-2015, 09:36 PM   #13
Pentaxian




Join Date: Nov 2007
Location: Western Canada
Posts: 5,474
QuoteOriginally posted by npc Quote
I have a K-5 IIs and I am definately ok with the performance of my 15/21/35 limiteds on it. But the 21 is not the sharpest lens ever and the 15 is known for its corner issues.
The 35 is fine on K-5 IIs but recently i saw some pictures taken with it mounted on sony a5100 via adapter and I was somewhat dissapointed with the results (the sony has a 24mpix sensor but I'm not sure if it has AA filter or not) ...

So I was wondering - what is your experience with these lenses on K-3 ? Are they up to the 24 mpix sensor?

I don't understand what you mean about the 21mm ...' the 21 is not the sharpest lens ever.'

It works very well for me...on my K5, K10D, Km.
02-24-2015, 10:24 PM   #14
Pentaxian




Join Date: Sep 2009
Location: Texas
Photos: Gallery
Posts: 3,480
The problems that you'll see going from a K5 to a K3 won't be because of the lens. The larger image will show off your faults in technique even more (motion blur, missed focus, etc).
02-24-2015, 11:03 PM   #15
npc
Veteran Member




Join Date: Apr 2013
Posts: 313
Original Poster
QuoteOriginally posted by jatrax Quote
Not sure what you are asking, maybe I'm misunderstanding. But the lens is not going to be any worse than it was on the k-5, though it might be better.
To put it in a different way - I know they are not going to be any worse, but is the resolution noticably better on k-3? Like if I take the same image with k-5 iis and k-3 and up-size the 16 mpix image to 24 - will I be able to really tell the difference?

I've seen some really impressive sapmples from the longer lenses and with the teleconverter where the ability to crop more is also very handy but I rarely use telephotos and I'm trying to figure if it is worth upgrading to K-3 some time in the future considering these are the lenses I have.
Anyway, seems everybody is happy with their limiteds on the K-3 so I take it as good sign


QuoteOriginally posted by stevebrot Quote
To be honest, it is more likely that a digital sensor will limit a lens than the other way around.
Well, if a lens outresolve a sensor across the frame, you won't be able to see any difference in sharpness between the center and edges of the image.

Of the 3 lenses in question (my copies of course) on K-5 IIs I can only say this for the 35 ltd. I guess if measured there is difference, but to my eyes it is as good as it gets.
That's why I was so surprised with the results on the a5100. Maybe it's just that it has an AA filter...
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!
diffraction, dslr, filter, frame, image, k-3, k-5, k-mount, k3, k3 users, lens, limit, limiteds, pentax k-3, pentax lens, resolution, sensor, sensors, slr lens, sony
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Will the Q be good enough? GabrielFFontes Pentax Q 5 07-16-2014 04:25 PM
Kit lenses - are they good enough for the K3? regislea Troubleshooting and Beginner Help 24 04-13-2014 10:56 PM
K-5 IIs - are my lenses "good enough" ? linds Pentax K-5 19 02-19-2013 04:34 AM
Advice requested: Are my photos good enough to charge for? dude163 Photographic Technique 13 10-14-2010 07:30 PM
how good are the weather seals on the star * lenses? kauaiguy Pentax SLR Lens Discussion 6 03-06-2009 11:48 AM



All times are GMT -7. The time now is 10:41 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