Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-23-2014, 10:13 PM   #1
Senior Member




Join Date: Sep 2007
Location: Seattle
Posts: 245
K-3 vs K-30 Autofocus

I have been using my K-30 for a year and have been happy with images I am getting from it. With the recent price drop of the K-3, I am considering an upgrade. My most concerned feature is the auto focus. I shoot mostly my 4 and 6 year olds running around at the park during the day time and I find the auto focus of the K-30 to be lacking at times. To those who had experience with both K-3 and K-30, will I gain much in auto focus by upgrading my K-30 to K-3 for my use?

10-23-2014, 10:51 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,128
QuoteOriginally posted by leeak Quote
I have been using my K-30 for a year and have been happy with images I am getting from it. With the recent price drop of the K-3, I am considering an upgrade. My most concerned feature is the auto focus. I shoot mostly my 4 and 6 year olds running around at the park during the day time and I find the auto focus of the K-30 to be lacking at times. To those who had experience with both K-3 and K-30, will I gain much in auto focus by upgrading my K-30 to K-3 for my use?
I think you'll gain a bit (plus superior low-light performance), but the main bottleneck is oftentimes the lens. What are you shooting with?

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:

10-23-2014, 10:58 PM   #3
Senior Member




Join Date: Sep 2007
Location: Seattle
Posts: 245
Original Poster
Thanks Adam for your reply. My lenses are in my signature. I was actually reading your review of the K3 and I have a question about you autofocus test vs the Nikon D600. At what focal length was the test done under DA for the 60-250 and Nikon 70-200/2.8? TIA.
10-24-2014, 12:08 AM   #4
Junior Member




Join Date: Jan 2013
Posts: 49
One friend of mine shoots K-5II and DA*55 and he is very satisfied with this combination. My personal experience is that there is not so big difference between K-5II and K-30 in terms of their AF reliability.

Some of his photos:

http://pentaxfriends.eu/gallery/albums/userpics/Koupani-4125_resize.jpg

http://pentaxfriends.eu/gallery/albums/userpics/Krosar-51352B5136_resize.jpg

http://pentaxfriends.eu/gallery/albums/userpics/Ve_Ctenicich-6237_resize.jpg

http://pentaxfriends.eu/gallery/albums/userpics/Na_lanovce-6679_resize.jpg


Last edited by cport; 10-24-2014 at 01:42 AM.
10-25-2014, 01:24 AM - 1 Like   #5
Pentaxian




Join Date: Nov 2013
Posts: 4,703
K-3 is FAR better in AF compared to my K5:
- the AF point work better in low light, Before it was difficult to achieve good focus with most lenses in low light, now this is easy.
- the center AF point size didn't change but the other AF point are really smaller. This make shallow deph of field shoot much easier to achieve as the camera really focus on what you select, and not some "distant" object in the frame.
- the f/2.8 capabilties make fast prime more accurate.
- the overall AF is faster making more suitable for action. For that last case, there real tracking capabilities that use both the AF sensors and the color metering. My understanding is that is not D7100 level, but is good.
- the screw drive motor is faster and more powerfull

It really changed my life in term of AF. Now all fast prime are very accurate to shoot with, even in low light. Before FA50 was really trial/error, now it work well. The 50-135 that was so slow to focus is now much faster and also more accurate. Overall the new AF is a game changer.

Compared to K30 I don't know, but I think K30 AF is much more like K5 AF than K3 AF... It sure have slower screw drive, no f/2.8 sensors, no small precise sensors, no 27 point AF, no new color and precise metering, no improved low light AF...
10-26-2014, 12:47 AM   #6
Senior Member




Join Date: Sep 2007
Location: Seattle
Posts: 245
Original Poster
QuoteOriginally posted by Nicolas06 Quote
K-3 is FAR better in AF compared to my K5:
- the AF point work better in low light, Before it was difficult to achieve good focus with most lenses in low light, now this is easy.
- the center AF point size didn't change but the other AF point are really smaller. This make shallow deph of field shoot much easier to achieve as the camera really focus on what you select, and not some "distant" object in the frame.
- the f/2.8 capabilties make fast prime more accurate.
- the overall AF is faster making more suitable for action. For that last case, there real tracking capabilities that use both the AF sensors and the color metering. My understanding is that is not D7100 level, but is good.
- the screw drive motor is faster and more powerfull

It really changed my life in term of AF. Now all fast prime are very accurate to shoot with, even in low light. Before FA50 was really trial/error, now it work well. The 50-135 that was so slow to focus is now much faster and also more accurate. Overall the new AF is a game changer.

Compared to K30 I don't know, but I think K30 AF is much more like K5 AF than K3 AF... It sure have slower screw drive, no f/2.8 sensors, no small precise sensors, no 27 point AF, no new color and precise metering, no improved low light AF...
Thank you for all your insight. I might give the K3 a go.
10-27-2014, 04:23 AM   #7
Junior Member




Join Date: Jan 2013
Posts: 49
I owned K-30 for almost one year, I currently own K-5II (also almost one year). There is not so much difference between AF (The step K10D ->K-30 was surprising indeed.), in some sense K-30 (K-50) has a more pleasant ergonomics (especially the choice of AF points with the help of Fx button and rollers).

K-30 is a very capable camera
11-01-2014, 09:01 AM   #8
New Member




Join Date: Dec 2010
Posts: 22
I have a k-3 and k-30. I've found that the k-3 hunts for focus less and produces more keepers. I primarily use a Tamron 17-50 and Pentax 50, so results with other lenses may differ.

11-01-2014, 09:44 AM   #9
Yos
Veteran Member




Join Date: Jan 2013
Location: Stockholm
Photos: Gallery | Albums
Posts: 533
I have a K-30 and a K-3. My lens collection might not be that impressive but I have noticed a big difference in AF speed when using them. And it's much easier to use my K-3 when taking pictures of our dog when he is playing. So imo it was worth it to upgrade from K-30 from K-3.
11-03-2014, 09:28 PM   #10
Senior Member
gebco's Avatar

Join Date: Mar 2010
Location: Winnipeg
Photos: Gallery | Albums
Posts: 284
QuoteOriginally posted by vegenigma Quote
I have a k-3 and k-30. I've found that the k-3 hunts for focus less and produces more keepers. I primarily use a Tamron 17-50 and Pentax 50, so results with other lenses may differ.
My Tamron 17-50 sits on my K-x probably 90% of the time. I am thinking of upgrading to the K-3. How is the AF of the K-3 with 17-50?
11-04-2014, 06:00 AM   #11
Loyal Site Supporter
Mikesul's Avatar

Join Date: Sep 2009
Location: Phoenix, AZ
Posts: 2,655
Autofocus on the k3 is excellent and significantly better than earlier Pentax cameras with every AF lens.
11-04-2014, 10:26 PM - 1 Like   #12
New Member




Join Date: Dec 2010
Posts: 22
QuoteOriginally posted by gebco Quote
My Tamron 17-50 sits on my K-x probably 90% of the time. I am thinking of upgrading to the K-3. How is the AF of the K-3 with 17-50?
Very fast and very impressive in less-than-stellar lighting. Center spot focus mode does a better job of finding the exact spot I want to be in focus, which has improved my DoF shots.

I wish I still had a k-x around so I could give you actual focus time numbers. I highly recommend the k-3 with that lens, with the caveat that I have read a couple user reviews that state the camera needs lots of manual adjustments for non-Pentax lenses to correct for front- or back-focusing problems. I haven't found that to be the case at all, personally. I attached my lens and needed no such adjustment.

Last edited by vegenigma; 11-04-2014 at 10:32 PM.
11-06-2014, 06:21 PM   #13
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,797
The K-3 has a stronger/faster AF motor so screw drive lenses perform much better vs older series bodies.
Some lenses that were considered AF dogs pep right up when you put them on the K-3.
I've noticed this with the DFA100WR which has a very long AF travel as a macro.
On the K-3 end to end travel is much quicker.
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!
auto, dslr, focus, k-3, k-3 vs k-30, k-30, k3, pentax k-3
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Focusingscreens.com EE-S Screen for K-3, K-5, K-5II, K-7, K-30, K-50 & K-500 Aperturae Sold Items 6 10-06-2014 06:49 AM
For Sale - Sold: KatzEye Split-Prism Focusing Screen - for K-3, K-5, K-5II, K-7, K-30, K-50 & K-500 chickentender Sold Items 7 04-15-2014 08:35 PM
scaled down K-3 in K-30 (K-50) body i_trax Pentax K-3 29 12-24-2013 06:20 AM
Pentax K-3 vs K-30 on AF & high ISO samuelyuen3 Pentax K-3 8 12-05-2013 10:13 PM
Current K-5 vs. K-30 autofocus comparison? Newtophotos Pentax K-5 5 08-27-2013 10:31 AM



All times are GMT -7. The time now is 09:34 PM. | 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