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07-11-2008, 02:33 AM   #16
Voe
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QuoteOriginally posted by Gooshin Quote
do it.



i simply doubt your sincerity in trying your hardest to make this an equal comparison.

Almost forgot, here is the center crop of hand held shot with Pentax 50-200 kit lens at 200mm using 1/13s, f/5.6, ISO 320.


Look Ma, no tripod!




OK, this test I dedicate to Comrade Putin and all the Canon kit lens shooters.



Both cameras set to ISO 100, and JPG.

Not sure about the JPG settings for Canon 450D, but the Pentax JPG settings are as follows:
Sharpness= 0, Saturation= 0, Contrast= 0.
Image Tone= Natural (which is of Pentax disadvantage as we know Bright mode is sharper).

I made a mistake and set the Pentax to 50mm instead of 55mm but everything else is the same, so hereby I confess this "major" error.

Both cameras were sitting on a tripod, and all the shots were taken using 2 seconds delay to avoid camera shake when pressing the button.



For your reference this is how the test scene looks (shot at 35mm with Pentax):



Following are the center crops


Comparing Canon 55-250 @ 200mm Kit (USM, IS) lens vs. Pentax 50-200 @ 200mm kit lens.


pentax 200mm f/5.6


canon 200mm f5.6


pentax 200mm f/8


canon 200mm f/8



Comparing Canon 18-55 Kit (USM, IS) lens vs. Pentax 18-55 kit lens (old model).


pentax 50mm f/5.6


canon 55mm f/5.6



pentax 50mm f/8


canon 55mm f/8


pentax 35mm f/5.6


canon 35mm f/5.6


pentax 35mm f/8


canon 35mm f/8


pentax 18mm f/5.6


canon 18mm f/5.6


pentax 18mm f/8


canon 18mm f/8




Let the result be a reminder for those who whine about the quality control from Pentax.

If anyone insist I can post corner crops, but I assure you the difference between the lenses is of a similar magnitude.

Cheers.


Last edited by Voe; 07-11-2008 at 03:18 AM.
07-11-2008, 04:19 AM   #17
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Those 200mm shots with the 50-250mm look like the IS hadn't kicked on. When you half-press the shutter, you have to wait about a second for the IS to "spin up". It then stays active for a bit, even after the shot is taken (so you can continue shooting and don't have to wait for each shot). I usually just keep half-pressing the shutter so it's pretty much active and ready to go so I don't miss the shot.

Either that or the 450D's AF is stuffed.

To be fair, I found the output at low ISOs more or less on par between the 40D and the K10D (although the 40Ds AWB indoors w/ flash sucks alot more than the K10D) I do prefer the high ISO shots of my 40D though (one of the reasons I switched)
07-11-2008, 08:06 AM   #18
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In the shots with the twine (and maybe the wristwatch), the background is more out of focus in the Canon shots than in the Pentax shots (at the same aperture). The Canon seems to be front-focusing (unless you didn't take the shots at the exact same distance from the subject with each camera) otherwise the DOF would be similar, wouldn't it?
07-11-2008, 08:59 AM   #19
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QuoteOriginally posted by egordon99 Quote
Those 200mm shots with the 50-250mm look like the IS hadn't kicked on. When you half-press the shutter, you have to wait about a second for the IS to "spin up". It then stays active for a bit, even after the shot is taken (so you can continue shooting and don't have to wait for each shot). I usually just keep half-pressing the shutter so it's pretty much active and ready to go so I don't miss the shot.

Either that or the 450D's AF is stuffed.

To be fair, I found the output at low ISOs more or less on par between the 40D and the K10D (although the 40Ds AWB indoors w/ flash sucks alot more than the K10D) I do prefer the high ISO shots of my 40D though (one of the reasons I switched)
The IS of the Canon 50-250 should not have kicked in as the camera was set on a tripod and both cameras used 2 seconds delay (which I guess for both means the use of MLU).

The focus on the Canon looks in focus in the viewfinder. Even with some front focusing it should not have affected the f/8 shots so much.
Click here if you want to see a full size image of the Canon 200mm f/8 shot:
Flickr Photo Download: canon-200mm-f5.6

I can't see the focus set on anything else.

QuoteOriginally posted by wildboar Quote
In the shots with the twine (and maybe the wristwatch), the background is more out of focus in the Canon shots than in the Pentax shots (at the same aperture). The Canon seems to be front-focusing (unless you didn't take the shots at the exact same distance from the subject with each camera) otherwise the DOF would be similar, wouldn't it?
Both cameras were sitting (on a box) at the exact same distance from the target.
If the Canon is front focusing maybe you can help me find where it has focused on.

The Canon shot (not a crop) at full resolution:
Flickr Photo Download: IMG_8735
The Pentax shot (not a crop) at full resolution:
Flickr Photo Download: IMGP8734

I agree with you regarding the depth of field, I know it does not make sense and may be my eyes are not that good but I cannot find on the Canon images where it is back focusing or front focusing by looking at the image.

07-11-2008, 09:15 AM   #20
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Fair enough....I missed the tripod comments. Still believe the 450D to have focus problems. I have seen lots of images from the 450D which looked fine.
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