Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
08-21-2010, 03:57 AM   #1
Senior Member

Join Date: Mar 2008
Posts: 282
Field review states: K-7 AF better overall than Canon 550D

Just found this interesting review mainly about the video functions of these two cameras:

40Limited: Canon EOS 550D vs Pentax K-7

(Use google if you don't read German)

Most interesting statement concerning AF:

"... Jedoch findet die K-7 mit dem 18-55 WR bei schlechtem Licht noch immer die schärfe, wo sich die Canon schon verweigert. Auf meiner K-7 befand sich zum Testzeitpunkt die Firmware Version 1.10. Nebenbei stellte ich auch ein ähnliches verhalten mit dem Phasen-AF fest, dass bei schlechten Lichtverhältnissen die K-7 immer noch einen Fokus gefunden hat wo sich die EOS550D schwer tat."

In short:
Contrast AF was slightly faster on the Canon.
K-7 managed to lock focus in bad light even when the 550D had trouble finding focus. This also applies to Phase AF (!).

What do you think?

08-21-2010, 09:50 AM   #2
Veteran Member
philbaum's Avatar

Join Date: Oct 2007
Location: Port Townsend, Washington State, USA
Posts: 3,659
That sounds great!!! I think low light autofocus is highly dependent on the speed of the lens. In this case they don't mention the speed of the Canon 18-135, but i assume its about the same as the Pentax zoom. But a good report nevertheless.
08-21-2010, 12:24 PM   #3
Veteran Member

Join Date: Mar 2007
Location: Boston, PRofMA
Photos: Albums
Posts: 3,027
I was shooting w/ a Canon friend (running a 40D) and shooting some flare photos for a model. He asked if I was having problems focusing and I didn't...he said he did if there's a lot of flare...I was using the 50/1.4 and had lots of flare.

Just shows you AF is a big "it depends"...
08-21-2010, 02:01 PM   #4
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 16,240
I have never understood what the issue is with pentax AF.\\

I was out today (tonight) shooting at ISO 6400 and there was no issue focusing in light that wide open on my Tamron 28-75 F2.8 resulted in less than 1/30th of a second. that is a very low ev value and the lens focused and locked within less than 1/2 second, there was no hunting, it cycled once to infinity and then came back and locked directly on focus

that is better than I could ever achieve in manual focus, so what's the issue. BTW I was 100 feet away from the subject so the AF illuminator has nothing to do with achieving focus

08-21-2010, 03:36 PM   #5
Veteran Member

Join Date: Mar 2010
Posts: 527
For me it never was a secret that the K-7 AF is better than the EOS 550 AF and the same Quality that the EOS 50 AF.
I sell that stuff daily and juse EOS 50 and K-7 for outdoor and Birds.
No chance to be better in target with the EOS 50.
Best regards,Andy
08-21-2010, 07:01 PM   #6
Veteran Member
mysticcowboy's Avatar

Join Date: Apr 2009
Location: port townsend, wa
Photos: Albums
Posts: 968
You don't need a test to recognize that the K7 is a better camera. Just pick the two cameras up. Look through the view finders. The K7 build quality is obvious and the EOS 550 is a pile of plastic and its viewfinder is tiny. I'm glad that the K7 focuses better but that's a small part of the package. If you want to compare to a Canon look at the 7D.
08-22-2010, 01:44 AM   #7
LeeRunge's Avatar

Join Date: Jun 2010
Location: Northern Alabama
Posts: 527
I would say the competition for K7 is the Canon 7d and the Nikon D300s. Which is a huge complement for K7 being that it not costs 600-700 less than either of those. You can basically get a K7 and a 16-50 DA* for what you would pay for just the body of either a Canon or Nikon.

I -almost- bought into Canon but the price of 28-200 range L glass made the camera and body @ 4000-5000 dollars. That for total weather sealing.

Nikon cost even more and the Lens weather resistance is damn hard to find.

K7 with two DA* 16-50 and 60-250 cost about 3000. I have been using this in Afghanistan with good results. The only weakness is on really hot nights the hot pixels come out when near the camera's operating limit (104).

Co-workers out here have Nikon D40 Nikon D90 and Canon 550. Those camera body's cost about the same or more than my K7 (on sale 765).

Pentax is a great deal in camera's.
08-23-2010, 12:29 PM   #8
Senior Member

Join Date: Mar 2008
Posts: 282
Original Poster
I have no doubt about which of these two is the better camera. I find it funny that some websites do even compare them in a general review. However, a specialized (e.g. video functions) comparison like in the blog above seems reasonable to me.

The thing is, it is often mentioned that the C*n*n AF would be superior by design. This review shows the opposite

PS: The 18-135 lens mentioned also is 3.5-5.6


  • 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!
af, camera, canon, dem, dslr, field review, focus, immer, k-7, mit, photography, sich
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax K-x or Canon 550D? khaz0r Pentax DSLR Discussion 92 08-28-2010 11:11 AM
Pentax K7 vs Canon T2i(550D) rohit anupoju Pentax DSLR Discussion 3 05-03-2010 05:29 PM
Kx high ISO wins against Canon 550D / T2i cyy47 Pentax DSLR Discussion 15 04-07-2010 10:08 PM
Pentax K20D vs. Canon 550D cloudswimmer Pentax DSLR Discussion 16 03-31-2010 07:17 AM
Canon EOS 550D with full manual control and 1080p 30 FPS. Firmware update time now? netrex Video and Pentax HDSLRs 17 02-10-2010 12:13 PM

All times are GMT -7. The time now is 01:28 PM. | 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]