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09-02-2012, 04:53 PM   #1
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Pentax K-5 vs Samsung NX100 - What am I thinking?

Cameras: Pentax K-5 and Samsung NX100
Lenses: D-FA 100mm f2.8 WR Macro and NX 60mm f2.8 OIS Macro

I was ready to unload my Samsung NX100 I picked up awhile ago as my "pocket camera". Out of curiosity I decided the shoot a few photos to compare with my K-5. By looking at the photos below needless to say I changed my mine of selling the Samsung.

Personally, I actually think Samsung NX100 (rumored to have the same sensor as the K-7) produced sharper images though K-5 may rendered color and contrast better (depend on taste). Take a look at them for yourself - did the NX100 outperform K-5 in this case or the NX 60mm is a better lens than D-FA 100mm?

1st photo - Pentax
2nd photo - Samsung

EXIF Data -
Aperture: f2.8
ISO: 100
Metering: Spot
Shutter: 1/400 & 1/360
AF Area: Center Point (aimed at the same spot)

Photos are adjusted slightly on exposure at same degree for both, and the photo from Samsung was cropped to ditto the focal length of the Pentax lens.




09-02-2012, 04:59 PM   #2
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Which one is NX100 and which one is K-5? I prefer the bottom picture as the contrast is not overdone.
09-02-2012, 05:02 PM   #3
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Top one is from K-5
Bottom one is taken with NX100
09-02-2012, 06:37 PM   #4
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Seems to me like the dof of the pentax is smaller so more blurred out leaves.

09-02-2012, 06:42 PM   #5
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The colours of the K-5 shot are OTT, I suspect shot in JPEG mode with saturation pumped up a bit, mine don't look like that at all but then I shoot RAW.
09-02-2012, 07:12 PM   #6
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QuoteOriginally posted by Verglace Quote
Seems to me like the dof of the pentax is smaller so more blurred out leaves.

I know but aperture setting was the same at f2.8. Lens front/back focus?
09-02-2012, 07:14 PM   #7
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QuoteOriginally posted by twitch Quote
The colours of the K-5 shot are OTT, I suspect shot in JPEG mode with saturation pumped up a bit, mine don't look like that at all but then I shoot RAW.
Perhaps. I seldom shoot RAW, can't comment.
09-02-2012, 07:22 PM   #8
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QuoteOriginally posted by mxlinn Quote
I know but aperture setting was the same at f2.8. Lens front/back focus?
Smaller Sensor=Smaller DoF. One of the biggest benefits of FF is the greater DoF control.(In order for that M4/3 camera to have the same DoF as the Pentax, it would need around an F1 lens attached.)

Looks like the Pentax has better rendition overall though, though the saturation is off.

Samsung is a good contender though, especially considering it's size.

09-02-2012, 07:35 PM   #9
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QuoteOriginally posted by Eulogy Quote
Samsung is a good contender though, especially considering it's size.
The Samsung is APS-C, similar sensor to that of the K20D and K-7.

The focal length does make a difference though, that 100mm will have a shallower DOF at f2.8 than that 60mm at f2.8 if the distance is the same. At a subject distance of 10 feet it goes from 11 inches deep on the 60mm to only 4 inches deep with the 100mm and the closer you get, the shallower it gets.

Last edited by elliott; 09-02-2012 at 07:43 PM.
09-02-2012, 08:03 PM   #10
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QuoteOriginally posted by twitch Quote
The colours of the K-5 shot are OTT, I suspect shot in JPEG mode with saturation pumped up a bit, mine don't look like that at all but then I shoot RAW.
I agree, if the images were shot in JPEG than what in-camera settings were used?
09-02-2012, 08:37 PM   #11
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Nigh on impossible to compare lenses of completely different focal lengths.
35mm macro will also produce a completely different look with the subject occupying the same size in the frame. I prefer shorter focal lengths, myself. All this test shows is that you do too.
09-02-2012, 08:46 PM   #12
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The NX100 is a great camera, it uses an updated K7 sensor. At ISO 100 there won't be too much difference between shots, but the K-5 runs circles around it in terms of performance(Buffer, AF speed, Tracking, FPS, Optical VF, ISO past 800). I am a big fan of the NX system, but the NEX beat it out because I like using MF lenses. I sold my NX for very little though. I wouldn't even bother selling it if you're happy with it, and so long as it's working as a small camera for you. I'll agree with the others though, the true test would be using RAW. You could, with adapters test both lenses on the NX100 also.
09-02-2012, 10:03 PM   #13
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QuoteOriginally posted by elliott Quote
The Samsung is APS-C, similar sensor to that of the K20D and K-7.

The focal length does make a difference though, that 100mm will have a shallower DOF at f2.8 than that 60mm at f2.8 if the distance is the same. At a subject distance of 10 feet it goes from 11 inches deep on the 60mm to only 4 inches deep with the 100mm and the closer you get, the shallower it gets.
Didn't actually know that. Presumed M4/3 due to the size of it, though that's becoming less of an obstacle every day now, isn't it?
09-03-2012, 12:48 AM   #14
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QuoteOriginally posted by mxlinn Quote
I know but aperture setting was the same at f2.8. Lens front/back focus?
There is more to dof than just the aperture, as someone mentioned sensor sizes can affect it, and also the focal length used, you can tell be the photo that you are using different focal lenghts simply by looking at the amount of compression in the background. also the distance of the sensor plane from the subject can also affect dof (not 100% on this but based on experience it did for me). A proper comparison would be using the same focal length and aperture and not moving the camera from a tripod.
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