Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
10-31-2010, 08:28 AM   #1
Loyal Site Supporter
imtheguy's Avatar

Join Date: Mar 2009
Location: Virginia Beach
Photos: Gallery | Albums
Posts: 2,950
K-5 Live View AF tested; Contrast vs Phase

After posting my first impression of the K-5 and its Live View Contrast detect versus Phase AF I decided to do it right this time since my first casual impression was negative. JohnBee will be happy to find out that I tested with a long lens and some with a TC.

All pics taken on tripod, 2 second lockup, defaults for JPG Bright, no NR, no adjustments, no PP, just the crop.

I tried to represent real world outdoor conditions although my initial problems were indoor so I will run a real test at some point indoors with different lenses.

K-5 with DA*300/4 and Pentax 1.7x AF TC where indicated. "Close" means about 7m and "Distant" is about 55m. Crops are very tight, and noise shows as I needed to keep the shutter speed up in the breeze to avoid motion blur. The lens focus ring was moved after each shot to force refocusing. Each focus was only attempted once then shot. However it never missed the focus point so there are no blurry shots left out.

3 separate shots with Live View with Contrast AF, f5.6, Close and in the shade

3 separate shots with Live View with Phase AF, f5.6, Close and in the shade

1 comparison with Live View, Phase AF on the top crop, Contrast AF on the bottom crop, f8, Close and in the shade

Added the 1.7x AF TC and reshot close at f9.5 (includes stops from TC), iso6400



Distant and bright Sun. All the shots looked very close so I just picked one from the middle of the pack. Very tight crops obviously.

Contrast at f9.5, iso200

Phase at f9.5, iso200

I had 50 shots to sort through and not one missed the focus so I am quite satisfied with the outdoor performance of the LV focus modes, especially Contrast, until I run into a lens/light/subject situation that changes my mind.

EDIT2- OK, NEW SHOTS INSERTED for distance test. I shot 5 of each and they were quite consistent. Although the Contrast looked better to me at close range in the shade, full sun at a distance the Phase AF looks sharper. As always though, YMMV.

Last edited by imtheguy; 10-31-2010 at 08:57 AM. Reason: Replaced Distant pics
10-31-2010, 11:29 AM   #2
Veteran Member

Join Date: May 2009
Location: Twin Cities, MN
Posts: 2,869
I also added some comments in the other thread; I managed to find an old quantaray 2x tc with af. Paired with my 55-300 shooting wide open indoors (camera exposure was 1/15 f5.6 iso6400 at 100mm). Phase detect wouldn't even bother trying, contrast detect was slow but hit it 8/10 times. The combo is probably about the worst lens/tc that I could put together for af testing...which bodes well for better combinations.

  • 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!
camera, contrast, dslr, focus, k-5, k-5 ii, k-5 iis, k5, pentax k-5, phase, shade, shots
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
How do you use live view? photog Pentax DSLR Discussion 29 03-03-2012 05:40 AM
Live view: K-x, K-r WMBP Pentax DSLR Discussion 8 09-18-2010 04:51 PM
AF in Live View with K-7 Kameraten Pentax DSLR Discussion 11 08-12-2010 09:15 PM
K7 live view sdh87 Pentax DSLR Discussion 3 06-07-2010 10:22 PM
K7 Live View ManOf7 Pentax DSLR Discussion 1 04-23-2010 04:58 PM

All times are GMT -7. The time now is 08:24 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]