Originally posted by audiobomber I'm not sure what cameras you're looking at. The K100D is no longer shown in the Comparometer. Also, I don't know what setting they used in the K20D photos. I did my own test. I shot the same scene with my K100DS and K20D at ISO's up to 3200. The K20D is set for Weak noise reduction. The K100DS has no user-accessible NR setting. It was clear that the K20 is at least one stop better.
The K100 and K100 Super show up if you set it ""all cameras" rather than just "current cameras". Have a look at the high ISO "Still Life" shots. The unfortunate thing about the comparison is they used different lenses. If you want to see the settings, look at the EXIF data on the images. I still stand by my opinion that with a properly exposed photo the level of noise (but not necessarily the appearance) is similar.
There are a good many reasons to buy a K20, and truth be told, I would dearly love one. Excessive noise in my K100 photos is not one of those reasons.
Originally posted by audiobomber Maybe. Honestly I know how many pixels are left when you crop a 14.6 mp image from 50mm to 135mm. All I know is, I can crop over twice as much as I used to with the K100.
But see, the problem is that the 50mm is not equivalent to the 50-135, seeing as how if you take a 6mpixel crop out of a 14.6mpixel image, you get about a 1.6x magnification - so about an 80mm lens. This is a very long way short of 135mm, but probably still more than enough for many portrait styles.
Originally posted by audiobomber But the OP doesn't have a 50-200mm, he has a 50mm 1.4. There's no question that a K20D with a 50mm lens is sharper than a K100DS with a 50-135. I don't see how anyone can argue otherwise. The 50mm is also two stops faster.
Nobody is trying to claim that a K100 with a 50-135 is going to capture more information at 50mm than a K20 with an FA 50. What is being discussed is that the 50-135 is an excellent lens which can deliver excellent results on any Pentax DSLR.
Just as it can on a K20, and just as the FA 50 does 'even' on a K100.
What is, however being pointed out is that cropping from 50mm is not the same as having a 50-135mm lens, and there are some things you can do with a K100 and a 50-135 that you cannot do with a K20 and FA 50, such as take shots at the long end of that zoom range. In exactly the same way, the K20 / FA 50 combo allows you to take photos at f1.4, which you cannot of course do with the 50-135.
Both cameras have a purpose, and both lenses have a purpose. Sometimes these overlap, sometimes they don't. What everyone DOES seem to agree on is that all four pieces of equipment are excellent.