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04-15-2011, 12:00 PM   #61
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Sorry everyone, I am an idiot. For some reason Picasa said my silver column shot was ISO 250 it was ISO 1250 so the noise does make sense. and with some underexposure it did seem to make it worse. Thank you for the tip that essentially brightening the image might be like increasing the ISO which can make things worse.


Last edited by Corvairfan; 04-15-2011 at 12:29 PM.
04-15-2011, 07:52 PM   #62
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QuoteOriginally posted by outsider Quote
I know there's been a lot of talk about the K-7's ISO issues and many of you would be more than content to bury the subject, if not, perhaps the K-7 itself. I really needed to word an inquiry to my specific needs. I'd like to know really how bad the K-7 is at Noise control. It's funny how I never heard anything about this issue until long after it was released. Now that the K-5 is out, everybody is jumping on that $1400 bandwagon, and knocking the K-7. Quite honestly, I would never have any reason to go over ISO 320 or MAYBE 400, but for my shooting style, you'd have to kick me in the shin to get me to set it higher than 250. I've heard volumes about the K-x's good noise control capability, but frankly, anything over ISO 640 on the K-x, for me, is just too noisy for my high standards. I just hate noise. Sure you can fix all sorts of things on post processing, but that takes time and only improves PERCIEVED quality. I like to get as much right in camera as possible. What i'd like to know, for those of you who may have an idea, is how the K-7 may compare to the K-x in terms of noise when using the same general settings and ISO. Is the samsung sensor in the K-7 so bad, that differences in noise is detectable at the lowest ISO? Or would both sensors be about the same at ISO 100, and the K-7 get worse exponentially from a certain point? This is definitely what i'd be most concerned about. Having a noticeably lower quality picture with the K-7, compared to the K-x at the lowest ISO (I shoot RAW %100 of the time). Also, it's my understanding that pentax "gurus" released an update(s) to help the poor samsung in the K-7 better deal with some of these issues. Have the updates noticeably improved anything?
I am very happy with the K7's noise up to and including ISO 2200. I don't own any noise reduction software yet so I've been experimenting with NR settings in camera (I believe I have all settings per Adam's recommendations here). I recently was able to use my new 35mm f2.4 lens in an extremely dark arcade. I decided to try my new lens wide open with ambient light, using TAv mode, and allowing ISO up to 3200. I was pleasantly surprised with the results and uploaded some examples for my brother to see, since he is considering the same lens for his K5. Have a look:

Incredible Pizza 2011 - a set on Flickr

[edit]
I guess my image never got saved in my original comment, here it is again. One example from my K-7 with the 35mm f2.4 and ISO 3200 with no NR or post processing:


Last edited by HEEGZ; 04-20-2011 at 07:32 PM.
04-20-2011, 04:54 PM   #63
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QuoteOriginally posted by Wheatfield Quote
I've never done anything scientific, but I found the K7 to be more than acceptable up to about ISO 640.
I think though, that if you don't like noise, you should give up photography and hide in a dark, soundproof room.
It doesn't matter what camera you use, there will always be situations where you get some noise.
Noise doesn't bother me. Much less than on film anyway.
First image: K-7 1000ISO cropped 50%. No noise reduction.
Second image: MZ-S Provia 400F. Considered "noisefree" for a 400ISO slide film.





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