grishazz I can surely understand your frustations. I would like to be more specific in my comments, but I can't see any of your images, so a valid comment on those is not possible for me. I would simply post the images here, it is easy.
I think, you have expectations, which no camera other than at least a Nikon D700 can fullfill, at least with respect to noise. It is the same situation as we had in film days: if you did not want visible grain in your images, you had to use either Kodachrome or Fuji Velvias - nothing else. So, if noise is the most important topic for you, buy a Nikon full-format sensor camera.
Originally posted by grishazzz I do agree with you, but still even at ISO500 the noise level is visible. I've uploaded some test pictures, so you can check it out:
There is some noise in any camera. Different makes exhibit different levels of noise, with full-format sensors having an obvious advantage. Otherwise, noise is pretty comparable between many APS-C sensor cameras. BUT there is a big difference between makes, between some manufactureres choose a very aggressive noise reduction as in-camera preset (Canon and to some extend Nikon and Sony), which eliminates fine detail at the same time. And others (namely Pentax) choose to accept some noise, but will preserve more fine detail.
If you want less visible noise, pump up the in-camera noise reduction. It is possible.And you will looose the Pentax-advantage of better fine detail.
Originally posted by grishazzz Ok, here there is only one big difference: you can not choose AF point manually! Now if you are using slow kit lens or slow 50-200 the AF 5 Auto points are ok, but with fast prime 50/1.4 it becomes a real problem! Many reviewers reported same thing! Unpredictable focus occurs only when fast lens is attached, so in order to get sharp shot, I have to use central point only! Now, in case I want to focus somewhere else, like for example: focus in the upper right corner, I have to lock focus and move my camera. Sometimes it takes too long, and I am missing/loosing the right moment.
I am using AF and I am using MF. As I wrote above, I always use center AF, except for some experiemnets. With the K-m I was very positively surprised, how good the automatic AF selection actually works. It might not be as good as Nikon's, but it is certainly very useable, at least with slow lenses. I never used a fast lens on a K-m, so I can't comment.
Originally posted by grishazzz K-7 has cropped sensor, like k-m/k20/k200, I do not expect too much! Same sensor size with more mega pixels - the result will be always the same: NOISE!
K-7 has much more advanced proccessor, so maybe! (maybe) it will control noise more effectively! Well.. we'll see! Still reading reviews and looking at the test shoots.
Noise is a difficult topic, because it is to a large degree a personal thing. Noise is not only "there", it has different properties from camera to camera. I for once can only say, that I easily can use ISO 1000 images out of my K20 as long as they are properly exposed!
Exposure and to a degree the kind of subject you photograph have a big impact on the noise visibility of your images. You can easily suppress the noise of any Pentax camera by increasing the noise reduction in-camera or by using a software during pp. You CANNOT bring lost detail back into a Canon image through post-processing, though. That is the trade-off between less visible noise and less detail.
It is very important though, to notice, that the K-m is an entry level camera. I guess, that app. 90 % of buyers will not even think about using a fast 50/1.4 lens with such a camera. Today, such a lens is already a tool for the specialist ort really advanced enthusiast - that it not the target gropup for that camera. With regard to AF, you might have been better of with a K20 - or a CaNikon at a higher price tag.
Ben