Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-21-2016, 07:21 PM   #1
Senior Member




Join Date: Apr 2015
Posts: 121
Anyone else using the DFA 24-70 on the K-1?

I've had the K-1 for 3 days now. The only lens I have is the 24-70. I'm having a hard time liking this combo. I need to determine if I'm going to keep the 24-70. The results so far a less than I'd hoped for. I'm not seeing the crispness desired. Portrait type pictures look soft, landscapes are disappointing. My Idea was to have a good general use lens. The alternative is to sell and replace with a couple of primes.

Is it just me, or are my expectations too high? I'd appreciate hearing about the results anyone else are getting!

06-21-2016, 07:27 PM   #2
Veteran Member




Join Date: Aug 2011
Location: Niagara
Photos: Gallery | Albums
Posts: 791
if you can, take the lens back and try another 24-70, you may just have a poorly aligned lens. Just fyi, you should post some sample images that you are unhappy with along with the metadata.
06-21-2016, 07:48 PM   #3
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,959
QuoteOriginally posted by PhilRich Quote
I've had the K-1 for 3 days now. The only lens I have is the 24-70. I'm having a hard time liking this combo. I need to determine if I'm going to keep the 24-70. The results so far a less than I'd hoped for. I'm not seeing the crispness desired. Portrait type pictures look soft, landscapes are disappointing. My Idea was to have a good general use lens. The alternative is to sell and replace with a couple of primes.

Is it just me, or are my expectations too high? I'd appreciate hearing about the results anyone else are getting!
The 24-70mm isn't perfect wide open, but it's still a pretty good lens. I personally went for the 28-105mm over the 24-70mm, as I prefer the more compact walkaround option as a supplement to my kit of primes.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

06-21-2016, 08:18 PM   #4
Pentaxian




Join Date: Sep 2012
Location: NY
Photos: Gallery
Posts: 1,914
If you have not already, you may want to try taking some shots using F stops that give you enough depth to accomodate the scenes you are dealing with to reveal proper detail. Otherwise if you find you have an ongoing problem with the lens, you may want to just contact the seller and return it for another lens, credit, or a full refund. If you have done reasonable testing and/or just feel you want something else, just let the seller know and return it.

The 28-105, 70-200, or 150-450 are other options, all depending on what you need.

06-21-2016, 08:35 PM   #5
Senior Member
Kennod's Avatar

Join Date: May 2011
Location: Melbourne
Posts: 126
I was also underwhelmed with my first shots taken with the 24-70 on the K-1. Images did not look at all sharp when pixel peeping on the cameras LCD screen. A quick test indicated that my 24-70 was back focussing slightly. After making AF fine adjustments in the menu I have been very satisfied with the sharpness and overall image quality. You should be able to get high quality images from this lens. If AF fine adjustment doesn't result in sharp images then you should return it for another copy.
06-21-2016, 08:55 PM   #6
Senior Member




Join Date: Apr 2015
Posts: 121
Original Poster
Here's a couple of sample shots.

I often use the scene down the street to check out a lens - the power lines, distant trees, all provide varied points for evaluation. This shot is off a tripod, 2 sec timer, with a f stop that provides max resolution. The focus point is on the distant house. The detail in the distant trees is not real good with the body of the trees looking real creamy when viewed at 100% and also when printed out.


Here is a crop at approximately 50%. The picture has been sharpened. Again, a very creamy result. BTW, my wife would shoot me for posting this if she knew!!


There doesn't seem to be a lot of alternatives to this lens. I selected it over the 28-105 since the online resolution tests appeared to be the same and from the f2.8 and 24mm capability.
06-21-2016, 08:55 PM   #7
Site Supporter




Join Date: Jan 2015
Location: NW Oregon
Posts: 359
QuoteOriginally posted by Kennod Quote
I was also underwhelmed with my first shots taken with the 24-70 on the K-1. Images did not look at all sharp when pixel peeping on the cameras LCD screen. A quick test indicated that my 24-70 was back focussing slightly. After making AF fine adjustments in the menu I have been very satisfied with the sharpness and overall image quality. You should be able to get high quality images from this lens. If AF fine adjustment doesn't result in sharp images then you should return it for another copy.
This ^^^^^^

The DFA 24-70 & DA*55 are the most used lenses on my K-1
06-21-2016, 11:37 PM   #8
Site Supporter
geomez's Avatar

Join Date: Mar 2013
Location: Preskit Arizona
Photos: Gallery
Posts: 1,560
QuoteOriginally posted by PhilRich Quote
Here's a couple of sample shots.

I often use the scene down the street to check out a lens - the power lines, distant trees, all provide varied points for evaluation. This shot is off a tripod, 2 sec timer, with a f stop that provides max resolution. The focus point is on the distant house. The detail in the distant trees is not real good with the body of the trees looking real creamy when viewed at 100% and also when printed out.


Here is a crop at approximately 50%. The picture has been sharpened. Again, a very creamy result. BTW, my wife would shoot me for posting this if she knew!!


There doesn't seem to be a lot of alternatives to this lens. I selected it over the 28-105 since the online resolution tests appeared to be the same and from the f2.8 and 24mm capability.


Did you do PDAF focus adjustments?

06-21-2016, 11:49 PM - 1 Like   #9
Veteran Member




Join Date: Nov 2008
Location: Melbourne, Australia
Photos: Gallery | Albums
Posts: 384
QuoteOriginally posted by PhilRich Quote
Here's a couple of sample shots.

I often use the scene down the street to check out a lens - the power lines, distant trees, all provide varied points for evaluation. This shot is off a tripod, 2 sec timer, with a f stop that provides max resolution. The focus point is on the distant house. The detail in the distant trees is not real good with the body of the trees looking real creamy when viewed at 100% and also when printed out.


Here is a crop at approximately 50%. The picture has been sharpened. Again, a very creamy result. BTW, my wife would shoot me for posting this if she knew!!


There doesn't seem to be a lot of alternatives to this lens. I selected it over the 28-105 since the online resolution tests appeared to be the same and from the f2.8 and 24mm capability.
Well the trees appear a number of metres forward of the white building. Given this, and that the shot is at F6.3 the trees are not going to be sharp. Remember, that on a full frame camera you get shallower depth of field at every f stop.

If you want the building as well as the trees sharp I think you needed to be shooting at F11-F16.

Howie Be
06-22-2016, 02:14 AM   #10
Site Supporter
dlai's Avatar

Join Date: Oct 2014
Location: Porirua
Posts: 22
Hi , I have the DFA 24-70 and K1. My main complaint is the size and weight. I knew it would be large but that did not prepare me for the actual size and weight!
It is so unlike a walkabout zoom that I decided to buy an FA 24-90 for walkabout and keep the DFA 24-70 for special events such as my music photography where the 2.8 aperture really is a bonus. Landscape and other critical work will also be where it will shine, I'm sure.


The FA 24-90 does pretty well on the K1 particularly with a little extra mid-tone contrast via Photoshop. A touch of smart sharpen/Gaussian blur removal brings it quite close to the DFA 24-70 for A4 prints. I'll examine the 2 more closely at A3 print size shortly.
Attached are two images:


1 K1 plus 24-70 of a busker being chatted to by a girl friend who dropped by. The focus is on the girl. ISO 500 1/200 f 3.5


2 K1 plus FA 24-90 a solitary busker ISO 200 1/200 f 6.3


Different lighting, different exposures so not really comparable but they hint at what each lens is capable of.
Attached Images
   
06-22-2016, 02:21 AM   #11
Veteran Member
robjmitchell's Avatar

Join Date: Oct 2007
Location: Melbourne Aus
Posts: 1,144
Well it looks sharp enough in the mid frame where the focus is. The background trees are simply out of focus. I would suspect your focus alignment might be out. Of course it should be noted the increased fine detail in higher resolution images take some getting used to when processing. Essentially (not technically)you have less contrast between pixels in an image because the pixels are so much smaller. The perception of edge definition suffers as a result until you learn too adjust.
06-22-2016, 03:43 AM   #12
Pentaxian




Join Date: Dec 2007
Location: Prague
Photos: Gallery
Posts: 1,198
I'm extremely happy with my DFA 24-70 so far. But I'm mostly using it for shots on wider aperture, where background blur is expected. If you want everything sharp, you need to stay in the f11 - f16 range and take care on proper focusing (not on infinity, but not too close, check with live-view if you are not sure). That's just the deal with high-megapixel full frame camera.
06-22-2016, 04:00 AM   #13
Site Supporter
Sandy Hancock's Avatar

Join Date: Feb 2012
Location: Adelaide Hills, South Australia
Photos: Gallery | Albums
Posts: 5,247
@PhilRich both shots are not focussed where you think they are.

The first image looks to be sharpest at the small patch of daisies in front of the base of the central telegraph pole, so much further forward than you think.

Your wife's portrait looks back focussed - the stitching in the leather sofa is in focus, while her face is soft and over-sharpened.

Do some tests with careful focus done in live view. Do a PDAF fine tune if necessary. Get back to us.
06-22-2016, 08:30 AM   #14
Senior Member




Join Date: Apr 2015
Posts: 121
Original Poster
I don't understand the comments on the focus issue. The street scene is at about 50mm. The focus was spot centered on the grey roof and the trees behind. The house is about 100 yards away. I visually saw that the focus was at infinity. Previously I ran a whole series of f stops using this scene and found that the sweet spot is between f5.6 and f8.For this lens it doesn't get any better for resolution. The trees I'm examining in the picture are the ones behind the house. With my old eyes I can see the top branch of the rear most pine trees, in the picture they are only faintly visibile. Additionally the texture of those trees is "creamy" in their main body.

Please explain how the focus could be improved. Focus adjustment makes sense if the subject is close, but in this case, I forced the camera to focus on the background at quite a distance away.
06-22-2016, 10:15 AM   #15
Site Supporter
geomez's Avatar

Join Date: Mar 2013
Location: Preskit Arizona
Photos: Gallery
Posts: 1,560
QuoteOriginally posted by PhilRich Quote
I don't understand the comments on the focus issue. The street scene is at about 50mm. The focus was spot centered on the grey roof and the trees behind. The house is about 100 yards away. I visually saw that the focus was at infinity. Previously I ran a whole series of f stops using this scene and found that the sweet spot is between f5.6 and f8.For this lens it doesn't get any better for resolution. The trees I'm examining in the picture are the ones behind the house. With my old eyes I can see the top branch of the rear most pine trees, in the picture they are only faintly visibile. Additionally the texture of those trees is "creamy" in their main body.

Please explain how the focus could be improved. Focus adjustment makes sense if the subject is close, but in this case, I forced the camera to focus on the background at quite a distance away.
If you're using AF while looking through the viewfinder, you're relying on the phase detection AF system. Its not always perfect. Because of this you can go into your settings and make fine adjustments to the AF for each of your lenses. If you haven't yet done this I think it's worth a try.

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!
24x36mm, full-frame, lens, pentax, results
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
DFA 24-70 or DFA 15-30 for the K-1? Hattifnatt Pentax SLR Lens Discussion 42 10-25-2016 08:03 AM
Diglloyd reviews DA 35, DFA 50 and DFA 100 Macro lenses on the K-1 Matchete Pentax SLR Lens Discussion 19 06-09-2016 09:18 AM
Anyone Try the SIGMA 24-70mm. f/2.8 IF EX DG HSM with the K-1? dcpropilot Pentax K-1 5 05-09-2016 03:32 PM
Help me evaluate the DFA 24-70 jatrax Pentax SLR Lens Discussion 47 04-21-2016 07:51 PM
Anyone else waiting for feedback on the 70-200 2.8? scottyinfrisco Pentax K-3 25 05-13-2015 02:29 PM



All times are GMT -7. The time now is 08:09 AM. | See also: NikonForums.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