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CPLTarun · 03-16-2018, 08:46 PM

I took a few more test images to test out my lens' focus/resolution. Just want to make sure that I don't have a faulty or unusually soft lens or anything, the possibility of which has been nagging me.

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They were all taken at f/8. With the image of the tree, I used center spot focus and focused on the middle branch. For the three identical landscapes, I used f/8 and focused on the foreground grass, middle of the frame, and distant buildings, respectively. These are unsharpened and unedited. I think it's safe to rule out that I have a bad lens, and just need to master my focusing and technique? I also did a basic indoor focus test with a printout of a focus chart, and I don't seem to have any front or back focusing issue.

**pschlute** · 03-16-2018, 10:27 PM

Originally posted by CPLTarun

These are unsharpened and unedited.

Raw files need to be processed. Importantly they need to be sharpened, usually in two stages, capture sharpening which is done early in the process by the raw converter, and lastly by output sharpening once the final image has been resized. Any unprocessed raw file will by it's very nature be soft.

StiffLegged · 03-17-2018, 01:04 PM

Nothing wrong there. There was a tiny bit of cyan fringing which was very easily removed, but the image I looked at was all I could have wished for in sharpness. Get to know your camera and lens now and enjoy!

zapp · 03-17-2018, 01:29 PM

My DA 21 mm had focus trouble twice, and I know of others having the same problem. It can happen that the interior focussing becomes lose. In that case you lens will not proberly focus to infinity. Check sharpness for close and far objects. Check live view vs. AF. The problem can be fixed by yourself or by service at liow cost. Make tests to ensure that you have a mimsfocus problem and any other more general problem.

robjmitchell · 03-17-2018, 03:08 PM

Don’t be afraid to use f11 on the 21, peak sharpness may be at F8 but F11 is still sharper than apertures larger than F5.6.
Its especially good for hyperfocal focusing, just adjust the F11 hyperfocal mark to the infinity distance and everything is in focus from 1m.

03-16-2018, 08:46 PM	#16
CPLTarun Junior Member Join Date: Feb 2018 Posts: 49 Original Poster	Some More Test Images to Test Focus & Sharpness I took a few more test images to test out my lens' focus/resolution. Just want to make sure that I don't have a faulty or unusually soft lens or anything, the possibility of which has been nagging me. Update your browser to use Google Drive - Google Drive Help They were all taken at f/8. With the image of the tree, I used center spot focus and focused on the middle branch. For the three identical landscapes, I used f/8 and focused on the foreground grass, middle of the frame, and distant buildings, respectively. These are unsharpened and unedited. I think it's safe to rule out that I have a bad lens, and just need to master my focusing and technique? I also did a basic indoor focus test with a printout of a focus chart, and I don't seem to have any front or back focusing issue.

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03-16-2018, 10:27 PM	#17
pschlute Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 4,548	Originally posted by CPLTarun These are unsharpened and unedited. Raw files need to be processed. Importantly they need to be sharpened, usually in two stages, capture sharpening which is done early in the process by the raw converter, and lastly by output sharpening once the final image has been resized. Any unprocessed raw file will by it's very nature be soft.

03-17-2018, 01:04 PM	#18
StiffLegged Pentaxian Join Date: Jan 2018 Photos: Gallery Posts: 1,242	Nothing wrong there. There was a tiny bit of cyan fringing which was very easily removed, but the image I looked at was all I could have wished for in sharpness. Get to know your camera and lens now and enjoy!

03-17-2018, 01:29 PM	#19
zapp Pentaxian Join Date: Jul 2011 Posts: 1,761	My DA 21 mm had focus trouble twice, and I know of others having the same problem. It can happen that the interior focussing becomes lose. In that case you lens will not proberly focus to infinity. Check sharpness for close and far objects. Check live view vs. AF. The problem can be fixed by yourself or by service at liow cost. Make tests to ensure that you have a mimsfocus problem and any other more general problem.

03-17-2018, 03:08 PM	#20
robjmitchell Veteran Member Join Date: Oct 2007 Location: Melbourne Aus Posts: 1,458	Don’t be afraid to use f11 on the 21, peak sharpness may be at F8 but F11 is still sharper than apertures larger than F5.6. Its especially good for hyperfocal focusing, just adjust the F11 hyperfocal mark to the infinity distance and everything is in focus from 1m.

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HD DA 21mm Ltd Lens Not Sharp Enough, or Just My Focusing Error?

PF Holiday Loyal Site Supporter Special | December Pentax Lens Tournament