Originally posted by jeff knight If there are any newbies out there wondering how people could possibly have such
different viewpoints about the same cameras, I would like to offer at least one explanation.................[/I]
I am not interested in any discussion as that has been done to death, and never ends up changing any minds. But you make an excellent point of someone reading this may benefit form different viewpoints. So, let me just give my opinion.
HIGH ISO
High iso sucks!, period. There is no substitute for low iso, as iso 100 is better than iso 200 and iso's above 1600 in any camera will look like absolute horror compared to these iso.
When it comes to iso 1600 and above we are just talking about which camera does a less shittier job, that's it. If ultimate IQ matter, then iso 50 is more important than better iso 6400. Loosing iso 100 for better high iso performance doesn't help me, and K-x without native iso 100 is a step backwards for me.
Then, why have high iso?, well mostly for low light work where flash cannot/or not wished to be used. If you do such low light work and are stuck in using an APS-C sensor then this will matter. High iso is also important for getting higher shutter speeds to freeze action even in good light with slow lenses (however in good light apparent iso performance is quite decent for all three cameras). But, when you use any camera in these instances you are settled on compromising IQ, and the K-x amongst the three will compromise the IQ the least.
High iso could be used in other instances, but overall it is used only a fraction of the time compared to low iso for an average photographer.
DYNAMIC RANGE
DR is a prime characteristic of any sensor, however at times small differences are greatly exaggerated. DPR which tests DR using real photographs get's a DR figure and then DxO mark get's it with sophisticated filters and instrumentation and gets another - they each get a different number and even the sensor rankings have no consistencies. I agree with the experts who say that DxO mark is measuring the true sensor DR, but how important can these differences be, that wouldn't even show up in photographs ? Having used the k10D with a much higher DR as measured by DxO mark than the K-7, I can unequivocally say, the differences doesn't show up much in real life.
Don't get me wrong. IMO, DR is a crucial characteristic of a sensor (IMO, much much more than high iso performance), but tests and charts and then subsequently some minds exaggerate even the small differences. I wish the K-7 has the DR of the K-x, or heck! even that of the K10D.
"K-7 HAS A CRAPPY SENSOR/IQ"
What is a good sensor?, is it only the theoretical DR and high iso performance that constitute a good sensor? will clean iso 100 images (not extrapolated iso 100)matter? does resolution matter? do things like color moiré and demosaicing artifacts matter as well ?
What is IQ? is it only based on low light performances or should other instances be counted (Do people still take photographs out in natural light?). Will better metering, better AF, better WB, 100% viewfinder to compose shots, high res. LCD to check your shots, ability to calibrate lenses result in better IQ as well?.
In the field, will the ability to check the exposure on the top LCD to fine tune it on the go, the ability to actually see the AF points, to adjust exposure parameters with both wheels result in a more efficient work flow?
Those who say 'inferior sensor" or 'IQ sucks' with the k-7 are having a severe case of tunnel vision (I am giving them the benefit of the doubt here, and be gentle and call it just 'tunnel vision'
).
CONCLUSION
If high iso performance is crucial for you at the expense of all other things (will be a minority of the photographers out there) then the best high iso sensor would be crucial and the k-x is ideal. For the majority of the photographer's out there, the K-7 is in a different league to the K-x and is an immense improvement over the K20D.