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Forum: Pentax DSLR Discussion
05-17-2009, 07:26 AM
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Hey Alfisti, I hear you. On the one hand I can't believe I survived without focus adjustment, but on the other hand it's a whole other can of worms!
I've been back and forth with some of the adjustments too--like I'm convinced a certain lens needs a +3, then it's a +5 all of a sudden.
btw, I didn't downsample anything but the first two--the rest are 100% crops from the center (and edge for the last two).
I think the K20 sensor's great, but maybe the extra pixels mean that the noise is harsher because noise has to be per pixel, so you'll see a finer grain which might be less pleasing. Does that make sense?
Looking at the two ISO 800 crops though, I think the grain is a little softer on the K100 even at pixel level, but my image is softer to begin with, so this might not help.
However, I'm sure you'll get some great results out of the K20, and see that the extra pixels aren't just a marketing gimmick!--I think it was definitely worth the upgrade for me, but I still like to have the K100 around for its portability.
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Forum: Pentax DSLR Discussion
05-16-2009, 01:08 PM
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Yep, but the OP wants to pixel peep:
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Forum: Pentax DSLR Discussion
05-16-2009, 11:30 AM
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Gus, we're talking about boring images, not amazing images, k?
Okay back to boring images in crappy light (it's pissing out there!) because that's where we see the noise/detail problems:
I did a quick set up with the K100 and the K20, both shot RAW, 25% sharpening, just imported into Photoshop CS3 and exported for web at 80%. Shot at 100 and 800 ISO with the K20, and 200 and 800 with the K100.
So it looks like I missed focus on the K100, but this was the best of the shots I got, trying both auto and manual focus. The important thing is your NEW camera, right?
I used the 43 ltd at f/4 (don't have the 35/2).
Full test images--K100D, followed by K20D:
100% crops, 25% sharpening. Moved the tripod in between because I had to redo the K100 pics when I forgot to shoot RAW--d'oh!
K100 ISO 200:
K100 ISO 800:
K20 ISO 100:
K20 ISO 800:
I gotta say it'd be hard to beat that K20 performance at ISO 100.
Looking at the K20 images, I'm wondering if there's some sharpening in there after all, but there'd be a white outline around the text if I did...
I just added some edge crops--you can see the image plane was a little out, I guess, because the K100 seemed to have the text more in focus on the edge.
This also illustrates how maddening tests like this can be ;) But at least I got a good result for the K20, which is what all this was trying to prove.
K100 edge:
K20 edge:
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Forum: Pentax DSLR Discussion
05-16-2009, 08:42 AM
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I have both--the K20 images are excellent, like the K100 sensor but just more pixels!
One thing with the AF--EVERY one of my lenses has required a focus adjustment on the K20. Different AF system. Try some of that--go through every step from -10 to +10 if you have to.
I haven't been shooting RAW lately (switched to Jpeg on vacation and never switched back), so I can't supply any images right now, but I can shoot something Monday if you want. Also haven't investigated the noise, but the K20 has more pleasing noise than the K10 did (not a typo--had a K10 in between).
Try some manual focusing zoomed in with Live View on the K20. It starts to look really pixellated, and that's when you know it's in focus. Should work for the bookshelf test.
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