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01-31-2013, 07:24 AM   #1
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K-R VS X100 High Iso Noise Comparison

Hey everyone.

I have owned the K-R for a couple of years now and fired off nearly 20,000 shots in that time. While I have been relatively satisfied with the performance for a lot of uses, I was extremely disappointed recently when I shot a friends wedding reception in low light. Up until that time I had been considering adding the DA21 or FA31 to my lineup of lenses for general use. As for current lens, I have the tamron 17-50, Da35, Da40, Sigma 10-20, A135, M50 1.7, and A28 2.8. For the wedding and most of the time I have the tamron on my K-R. As a result of the disappointing performance at the wedding and in general during low light shoots I decided to pick up an X100. I was blown away at how much better the FUJi performed with regards to high iso noise performance. I have to say I'm a little shocked as everyone speaks highly of the K-R, K-X, K-5 high iso performance. Am I missing something or doing something wrong? I have included some test shots, all shot within a few minutes of each other on a tripod with high iso noise reduction set at AUTO, shot in JPEG's at F2.8 at ISO 3200, 6400 for the K-R with the Tamron 17-50, then the FUJI X100. What do you guys think?

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01-31-2013, 07:55 AM   #2
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1. yes, the x100 sensor is better than the k-r. With that being said, the x100 is about on-par with the k-5. I used to shoot a k-x, which performs similarly to the k-r and experienced the same jump in high-iso performance when i switched over.
2. shooting in RAW helps a bit. NR algorithms in PP tend to be more effective and give more detail than in-body NR in my experience. You also don't waste time waiting for the camera to process the images
01-31-2013, 08:03 AM   #3
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Thanks for the reply. Interesting, I didn't think the high iso performance on the k-5 was that much better than the K-R. I am still surprised how big the difference is in iso performance between the k-r/x100, good to know that I should expect the K-5 to be that much better though, as it was likely going to be a future upgrade for me based on it's other advantages over the K-R. Although with the K5II out, I would have to go for that one, then it would deserve a nice prime with a similar focal length to the fuji for travel/street i.e. the DA21, so this could be a pricey proposition!
01-31-2013, 08:08 AM   #4
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sounds like a plan. IMO, the DA21 was just simply the best street lens I've ever shot with. Its small, discreet, focuses fast and has the perfect FoV for how I shoot street

01-31-2013, 08:22 AM   #5
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I find it really strange, because the Fuji pictures are brighter than the Pentax ones, at same apparent exposure (1/60, f/2.8, ISO 3200). Notice how much detail is blown out in the window in the Fuji pictures.
01-31-2013, 08:44 AM   #6
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Hmm, good point, I hadn't even noticed that actually... Interesting.
01-31-2013, 08:51 AM   #7
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it just means the effective T-Stop of the tamron is lower than that of the fuji. Aperture is just the ratio of the opening to the focal length, so its not the perfect measure of light transmission
01-31-2013, 09:25 AM   #8
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The Pentax is better at capturing the whole scene as one would see it.
The amount of "noise" is dependant on the light and exposure as much as the ISO setting.
Always keep the ISO as close to the native sensor value, just because your car can do 200mph doesn't mean you should drive that fast !

01-31-2013, 10:13 AM   #9
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Shoot RAW. My k-x's jpegs suck as far as noise goes. So does the k-5. RAW, however, is a completely other story.
01-31-2013, 10:41 AM   #10
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If you are a in-camera JPEG shooter, then something like the Fuji is a good choice. And do you have Auto DR turned on in the X100?
01-31-2013, 11:02 AM   #11
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QuoteOriginally posted by bobpur Quote
The Pentax is better at capturing the whole scene as one would see it.
The amount of "noise" is dependant on the light and exposure as much as the ISO setting.
Always keep the ISO as close to the native sensor value, just because your car can do 200mph doesn't mean you should drive that fast !
Hi Bobpur. In what way is the K-R better than the fuji at capturing the scene as it appears to the naked eye? I do understand though that there are other factors affecting the noise. That's why I decided to test them head to head in a controlled test, as my casual experience was showing a difference I wanted to confirm.
01-31-2013, 11:04 AM   #12
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QuoteOriginally posted by JinDesu Quote
Shoot RAW. My k-x's jpegs suck as far as noise goes. So does the k-5. RAW, however, is a completely other story.
Good point on the Jpeg versus RAW, I should compare those next. The reviews do say the JPEG enging in the x100 is supposed to be quite good so I've been using it in JPEG %95 of the time since I got it as most shots have been casual in nature. I did have the AUTO DR on, on the FUJI. I was also using the Velvia film simulation rather than the Provia/Standard which would explain some of the color difference between the two cams.
01-31-2013, 11:17 AM   #13
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QuoteOriginally posted by Ryan Cole Quote
...
Velvia film simulation rather than the Provia/Standard which would explain some of the color difference between the two cams.
And it explains the exposure in high and low values too. Positive film was never good at DR and if it is simulated then blacks are most likely crushed and highlights lost.
01-31-2013, 11:48 AM - 1 Like   #14
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Shoot in RAW. This is my KX at 6400
01-31-2013, 12:07 PM   #15
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QuoteOriginally posted by john5100 Quote
Shoot in RAW. This is my KX at 6400
Nice shot, it looks very clean! I do frequently shoot RAW and use aperture for processing/noise reduction.
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