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10-17-2009, 02:28 AM   #1
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Measurebation with my new K-x

So I received my K-x today. Just in time for the Pentax World SyncSnap as well as my Livejournal photo challenge. I could not have done this photoshoot at the top of the Sears Tower (now Willis Tower) with my old K2000. The high ISO performance was a distinct improvement, and the manual focusing of my tilt lens using live view was awesome! Overall, I'm really impressed with the K-x coming from the K2000.

After I got home, I took a bunch of pictures with the K-x and my old K2000 to compare their white balance and high ISO performance. Check out the "measurebation" set here: flickr link




Last edited by devorama; 10-17-2009 at 02:35 AM.
10-17-2009, 02:44 AM   #2
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Cool. And thanks for sharing this quick test.
Of interest is the difference between tungsten results. Didn't think it would contrast that much.
The AWB is a definite improvement.
Looks like a fine camera.
10-17-2009, 02:45 AM   #3
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can you show us the full-sized pictures converted from RAW to jpeg with any good fixed lens?


1. what about speed in RAW? after 5 shots in RAW - what then?
2. what batteries do you use?

Last edited by ogl; 10-17-2009 at 02:58 AM.
10-17-2009, 03:47 PM   #4
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QuoteOriginally posted by ogl Quote
can you show us the full-sized pictures converted from RAW to jpeg with any good fixed lens?


1. what about speed in RAW? after 5 shots in RAW - what then?
2. what batteries do you use?
For shooting in RAW, I got similar results with my Class 4 and Class 6 SDHC cards, so I think the limiting factor is the speed of the buffer flush.

For DNG, after the first fast 5 shots, it paused about a second, then it took about 1 shot per second, but at somewhat irregular intervals. Sometimes two quickly and then a longer pause, sometimes 1 per second.

Interstingly enough, the PEF files were slower. Still 5 quick shots, but then maybe 1.4 seconds per shot. I guess it has to compress the data before it can store on the card?

I'm using the Lithium batteries it came with right now, but I will use my rechargable Duracell slow discharge NiMh after that.

I took a bunch of controlled RAW shots, but I left the CD with the new version of the Pentax software at my office, and the old Photo Browser and Photo Laboratory won't open these PEF or DNG files! I will try to process them later with UFRaw.

5 frames quickly, then about a 1 second pause, then about 1 shot per second. This was with PEF or DNG on a Class 6 SDHC card

10-17-2009, 04:06 PM   #5
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Guys can you please confirm / deny that k-x doesnt have per lens AF adjustment feature?
10-17-2009, 10:12 PM   #6
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QuoteOriginally posted by ilya80 Quote
Guys can you please confirm / deny that k-x doesnt have per lens AF adjustment feature?
I don't see any mention of this in the camera menus or in the printed manual, so I'm guessing it's not possible without some firmware hacking.
10-17-2009, 10:45 PM   #7
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QuoteOriginally posted by devorama Quote

Interstingly enough, the PEF files were slower. Still 5 quick shots, but then maybe 1.4 seconds per shot. I guess it has to compress the data before it can store on the card?
K20D is the same. DNG is faster than PEF.
10-18-2009, 02:10 AM   #8
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QuoteOriginally posted by ogl Quote
can you show us the full-sized pictures converted from RAW to jpeg with any good fixed lens?
I added some more test shots to my flickr page.

The flower shots were taken with my Pentacon 6 mount Zeiss Flektogon 50mm at F/8. That's the sharpest lens I have. They were also taken with a tripod to minimize shake.

10-18-2009, 03:01 AM   #9
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Thanks a lot for additional shots. Clearly shows what the camera is capable of. For me ISO3200 is on the edge of usability and probably as far as I could go with it.
10-18-2009, 04:07 AM   #10
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Great stuff.
Seems the K-x is a contender in the entry-level market.
Speed is comparable to other cams in its range, and high ISO performance reasonably impressive.
Thanks for sharing this info.
10-18-2009, 06:57 AM   #11
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could you tell a word on a sound of taking shots, which one is louder or more silent, is the difference noticable?

thanks
10-18-2009, 08:25 AM   #12
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QuoteOriginally posted by devorama Quote
I added some more test shots to my flickr page.

The flower shots were taken with my Pentacon 6 mount Zeiss Flektogon 50mm at F/8. That's the sharpest lens I have. They were also taken with a tripod to minimize shake.

Excellent controlled shots! Nice low contrast detail shots with easy comparison images - better than some review sites.

Your dog is quite the tired one

Last edited by Eruditass; 10-18-2009 at 08:30 AM.
10-18-2009, 01:59 PM   #13
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Good, useful shots and looks like a great lens too.

The K-x is shaping up well as my street shooter to-be. Mated up to something like the 40mm pancake it should be great in that role.
10-18-2009, 02:24 PM   #14
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QuoteOriginally posted by devorama Quote
So I received my K-x today. Just in time for the Pentax
Hi, thanks for sharing.
Could you tell a word about AF speed ? Better than K2000 ?
10-18-2009, 02:29 PM   #15
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While we are on the subject of K-x measurebating, these are a excellent series of K-x ISO test shots from a French photo site, with JPG and DNG images available for download too.

Test Pentax K-x : gestion du bruit électronique

I'm quite impressed with the colour and detail retained even in the 3200 ISO JPG shots, under what certainly looks like less than ideal lighting.
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