Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-04-2007, 04:18 PM   #151
Site Supporter
dave kitson's Avatar

Join Date: Sep 2006
Location: Lichfield, UK
Photos: Gallery | Albums
Posts: 473
QuoteOriginally posted by philmorley Quote
Hi,


Well testing is well under way, the pic aint more interesting yet (after plenty of vodka), but it is getting dam hard to type, every word wrong. Oh well keep on testing

Phil

Good stuff, I think I'll try to replicate your findings

dave

11-04-2007, 04:49 PM   #152
Inactive Account




Join Date: Oct 2007
Location: Zagreb, Croatia
Photos: Gallery
Posts: 105
SDM is definitely faster then FA
In fact, one evening two friends of mine brought their gear to do the testing of AF in real life. We did that in low light enviroment, in local pub.
Opposition was:
Canon EOS 1 Mark II with 70-200/2.8 L
Nikon D 80 with 70-200/2.8 VR
and my K 10 D with DA* 50-135/2.8



We tried to change focus between two points, one was about ten feet, the other was about thirty feet from us, with central focus point active.
Conclusion was: they performed the same, and as long as we aimed correct on an contrast point, focus was equally fast, and locked, when we aimed at some dull point without contrast, focus wasn't obtained. And all three performed the same.

Testing was performed by Sports photographer of the year in Croatia, professional for many years, he is using Canon, so I am confident in results. He said that the result varies in ability to pinpoint the contrast point, and that is skill of a photographer. As far as he is concerned, lens and body from Pentax are top notch.

Forgive me for my bad English, if any.
11-04-2007, 10:43 PM   #153
Veteran Member




Join Date: Mar 2007
Posts: 691
Kresica your English was just fine and clear straight to the point.
11-05-2007, 02:58 AM   #154
kay
Junior Member




Join Date: Oct 2007
Location: Johannesburg, South Africa
Posts: 40
Thanks for that, Kresica! Very interesting The comparison shot with the competitoin is great - it demonstrates the relatively small size of the Pentax gear quite nicely!

11-05-2007, 03:20 AM   #155
Veteran Member
Matjazz's Avatar

Join Date: Sep 2006
Location: EU/Slovenia
Photos: Gallery
Posts: 774
No mattetr how hard I found it to believe that Pentax or any other company would use new tecnology that performes worse than than the old one, I was still affraid that it might be true.
Kresica's post confirms that this is yet another RH's rambling based on a fraction of truth.
11-22-2007, 10:40 AM   #156
New Member




Join Date: Nov 2007
Location: Rio do Sul/SC - Brazil
Posts: 1
Hi all. I`m a happy K10D user from Brazil. Happy user...However, last weekend I used the
k10D/FA 50 mm/DA 18-55 with fgz360 in a wedding. The AF.S (center spot AF) worked very slow. Shoot walking people was difficult because the AF was VERY slow.

The canon 30d with 18-55 mm is much faster.

While the 30d could focus in less than 1 second, the k10d/18-55 mm worked the same down light scene in 3-4 s.
The majority of photos had perfect focus, but the AF is very slow.

Another issue: When the FGZ360 AF assist lamp worked, the K10D AF get a faster focus lock. But, the AF assist lamp only works under very low light conditions...


What`s the problem?

Regards,

Pablo

Last edited by mac-lister; 11-22-2007 at 11:06 AM.
11-22-2007, 10:45 AM   #157
Veteran Member
lol101's Avatar

Join Date: Jul 2007
Location: Garennes sur Eure France
Photos: Gallery
Posts: 900
QuoteOriginally posted by mac-lister Quote
Hi all. I`m a happy K10D user from Brazil. Happy user...However, last weekend I used the
k10D/FA 50 mm/DA 18-55 with fgz360 in a wedding. The AF.S (center spot AF) worked very slow. Shoot walking people was difficult because the AF was VERY slow.

The canon 30d with 18-55 mm is much faster.

While the 30d could focus in less than 1 second, the k10d/18-55 mm worked the same down light scene in 3-4 s.
The majority of photos had perfect focus, but the AF is very slow.

What`s the problem?

Regards,

Pablo
Well... the problem is that Pentax AF tracking is ... errrr... how can I put it.... pretty inefective (especially in low light)?

(Compared to Canon and Nikon at least).

I don't know if it improves with the SDM lenses... but I wouldn't count on it, it's rather a matter of implementing a better algorithm.
11-22-2007, 11:05 AM   #158
Veteran Member
WMBP's Avatar

Join Date: Dec 2006
Location: Dallas, Texas
Photos: Gallery
Posts: 2,496
QuoteOriginally posted by Matjazz Quote
No mattetr how hard I found it to believe that Pentax or any other company would use new tecnology that performes worse than than the old one, I was still affraid that it might be true.
Kresica's post confirms that this is yet another RH's rambling based on a fraction of truth.
Trying hard here to follow the tiny bit of useful info in this thread and I don't understand this comment. Didn't Kresica's post show that the SDM focusing on the Pentax da* 50-135 (a lens I own myself) was just as fast as comparable lenses from Canon and Nikon? And if that's the case, then what's valid in RH's original post -- or why would you say that the new focusing technology may actually be worse than the old?

Will

P.S. Would someone PLEASE explain to Rice High that the word "measurbator" does not have positive connotations?

11-22-2007, 11:14 AM   #159
Veteran Member
lol101's Avatar

Join Date: Jul 2007
Location: Garennes sur Eure France
Photos: Gallery
Posts: 900
QuoteOriginally posted by WMBP Quote
Trying hard here to follow the tiny bit of useful info in this thread and I don't understand this comment. Didn't Kresica's post show that the SDM focusing on the Pentax da* 50-135 (a lens I own myself) was just as fast as comparable lenses from Canon and Nikon? And if that's the case, then what's valid in RH's original post -- or why would you say that the new focusing technology may actually be worse than the old?

Will

P.S. Would someone PLEASE explain to Rice High that the word "measurbator" does not have positive connotations?
I read it as if he WAS affraid RH might have been right but that Kresica's post reassured him he was not.
11-22-2007, 11:34 AM   #160
Veteran Member
WMBP's Avatar

Join Date: Dec 2006
Location: Dallas, Texas
Photos: Gallery
Posts: 2,496
QuoteOriginally posted by lol101 Quote
I read it as if he WAS affraid RH might have been right but that Kresica's post reassured him he was not.
Ah, yes, now I see. Thanks for the clarification.

Glad to hear it!

As I say here frequently, I do NOT carry a yardstick, focus chart or stopwatch with me when I go out to take photos. But I've taken a couple thousand shots with the DA* 50-135 and my impression is that it is a really nice lens. I am very happy with its results, at least when I do my part. The quiet focus still surprises me a bit, but the overall experience certainly doesn't seem WORSE than the experience of using my "normal" lenses.

Will
11-22-2007, 12:03 PM   #161
Inactive Account




Join Date: Oct 2007
Location: Zagreb, Croatia
Photos: Gallery
Posts: 105
QuoteOriginally posted by lol101 Quote
Well... the problem is that Pentax AF tracking is ... errrr... how can I put it.... pretty inefective (especially in low light)?

(Compared to Canon and Nikon at least).

I don't know if it improves with the SDM lenses... but I wouldn't count on it, it's rather a matter of implementing a better algorithm.
Hm, I admit that I haven't tried this with my 50-135, but I was very satisfied with AF tracking and my DA 16-45, I used it for car races on one occasion.



But I promise that I'll try!
11-22-2007, 01:45 PM   #162
kay
Junior Member




Join Date: Oct 2007
Location: Johannesburg, South Africa
Posts: 40
That is a great photo!
11-22-2007, 03:27 PM   #163
Veteran Member
lol101's Avatar

Join Date: Jul 2007
Location: Garennes sur Eure France
Photos: Gallery
Posts: 900
QuoteOriginally posted by Kresica Quote
Hm, I admit that I haven't tried this with my 50-135, but I was very satisfied with AF tracking and my DA 16-45, I used it for car races on one occasion.



But I promise that I'll try!
Strangely enough, it goes to prove that the K10 has less difficulty following a race car in daylight than following walking people in low light....

Excellent picture by the way.
11-22-2007, 04:32 PM   #164
Site Supporter
ChipB's Avatar

Join Date: Nov 2007
Location: Austin, TX area
Photos: Gallery | Albums
Posts: 1,647
"The thing is that in the film days, the strain put on the AF/AE systems was much less.

The precision required to focus with film is much less than for digital, plus, how many tme were you looking at your picture enlarged to the equivalent of 100% view on screen?"


Hi, I've been following this with, I hope, an unbiased attitude. While RH can be, and is, "abrasive", he's not been alone. That said, I have a question about the above statement from Will about AF/AE systems. I don't understand why digital is more difficult than film. I mean, getting something in focus shouldn't be any different, should it???

Chip B
11-23-2007, 03:47 AM   #165
Inactive Account




Join Date: Oct 2007
Location: Zagreb, Croatia
Photos: Gallery
Posts: 105
QuoteOriginally posted by lol101 Quote
Strangely enough, it goes to prove that the K10 has less difficulty following a race car in daylight than following walking people in low light....

Excellent picture by the way.

Thanks
OK, I'll try something tonight, and post it here.
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!
camera, dslr, experiment, k10d, lenses, pentax, photography, sdm
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Flash on....slower shutter speed? D4rknezz Troubleshooting and Beginner Help 12 08-15-2010 12:53 PM
is SDM speed faster on newer bodies? Reportage Pentax DSLR Discussion 7 07-26-2010 10:57 PM
SDM and AF Speed? VHDEL Pentax DSLR Discussion 2 10-12-2009 06:18 AM
How much slower is the K20D's AF speed? LeDave Pentax DSLR Discussion 0 07-01-2009 04:04 AM
Would SDM lens speed up K10D's AF? drabina Pentax DSLR Discussion 27 01-02-2009 09:42 PM



All times are GMT -7. The time now is 09:07 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