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03-21-2014, 08:38 AM   #106
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Paula Cole

DA* 50-135mm F2.8
ISO 2500 pushed +1





ISO 4000 pushed +1/2


03-23-2014, 08:00 AM   #107
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QuoteOriginally posted by dosdan Quote
Using Stagnant's ISO12800 PEF, I've run a comparison of the NR5 algorithm in the new SilkyPix 6:

https://www.pentaxforums.com/forums/32-digital-processing-software-printing/2...ml#post2748344

Dan
Thanks, for the link. The SP6 output looks more detailed, yet more noisy. I guess I prefer this kind of NR as opposed to SP5.
03-23-2014, 03:50 PM   #108
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QuoteOriginally posted by fgaudet Quote
Got mine (K3) last week, returned it on Tuesday... As Nornhead said, anything past 400 was very noisy. Unacceptably noisy, worst than my 12 year old, 1 megapixel HP point and shoot with a microscopic sensor. I'm still debating whether I'll be asking for a replacement or a refund. I didn't make a fuss about it because something had to be wrong with the camera (shit happens). Lots of people posted pictures at 12,800 and 25,600 with less noise than I was getting at 800, even after going through Dfine (NR plugin).

I'm getting the feeling that the Sony sensors may not be consistent in quality. Because as I read the post here and elsewhere, either the people can't believe how good it is (noise wise) or find the camera to be very bad with noise.
Visible noise is a factor of signal to noise ratio. At a given iso setting, one shot may be terrible, another may be great. It was the same with the K5.

A stop of aperture is not equal to a stop in shutter speed is not equal to a stop in iso when it comes to noise. Slower shutter speeds seem to result in less noise. I have decent shots at iso 6400 and terrible ones at iso 800.

I find that choosing a combination of widest aperture and longest shutter as possible gives me a workable shot no matter the iso, within limits. Get as much light as possible for as long as possible onto the sensor. Oddly in bright conditions closing the aperture and short shutter, driving up the iso gives a noisy photo, where lower light conditions with an open aperture and long shutter at the same iso gives a good photo. Why I have no idea; I suspect the signal to noise ratio is not a constant but a curve, and it is a matter of finding the sweet spot on the curve for the conditions.
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