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Forum: Pentax SLR Lens Discussion 01-19-2009, 06:57 PM  
New Sigma 18-50mm f2.8 lens seems a bit soft?
Posted By kj1225
Replies: 9
Views: 3,396
new Images are up!
Forum: Pentax SLR Lens Discussion 01-16-2009, 06:07 PM  
New Sigma 18-50mm f2.8 lens seems a bit soft?
Posted By kj1225
Replies: 9
Views: 3,396
hmm I do have the new Macro version EX DC Macro
Forum: Pentax SLR Lens Discussion 01-15-2009, 04:56 PM  
New Sigma 18-50mm f2.8 lens seems a bit soft?
Posted By kj1225
Replies: 9
Views: 3,396
hmm I think they might be a little underexposed but I pretty much went by the exposure gauge on the camera and it's telling me that the exposure is fine... I've noticed that too... camera says it's well exposed at the time of the shot but it comes out underexposed most of the time.

I didn't use any specific method... I just took some quick shots around the house to test the new lens and it felt a bit "soft" or not focusing properly.

These were shot indoors so the lighting might be a bit on the low end.

I've been looking at these charts and a lot of them people claim are inaccurate so I'm kind of stuck on deciding which one to use.

Any other feedback is appreciated!

Thank You!
Forum: Pentax SLR Lens Discussion 01-15-2009, 03:52 PM  
New Sigma 18-50mm f2.8 lens seems a bit soft?
Posted By kj1225
Replies: 9
Views: 3,396
UPDATED!

Just did some tests and wanted to see if I can get some opinions on the sharpness of my new lens!

UPDATED SHOTS FOR YOUR JUDGMENT!



These were taken under the following conditions:

-Tripod Used

-Sufficient natural daylight through a window behind the camera

-ISO 100

-Image Stabilization OFF

-Cable Switch was used


18mm F2.8 1/250 sec

FULL IMAGE - http://images32.fotki.com/v1088/filez3Yf/ed98c/1/1452034/7149810/CameraTest011909001.jpg

100% CROP - http://images33.fotki.com/v1136/fileI3Q9/ed98c/1/1452034/7149810/18mmf2_8crop1.jpg


18mm F5.6 1/60 sec

FULL IMAGE - http://images32.fotki.com/v1092/fileQrjk/ed98c/1/1452034/7149810/CameraTest011909002.jpg

100% Crop - http://images47.fotki.com/v1397/fileLdBh/ed98c/1/1452034/7149810/18mmf5_6crop1.jpg


18mm F8 1/45 Sec

FULL IMAGE - http://images40.fotki.com/v1242/filemlsU/ed98c/1/1452034/7149810/CameraTest011909003.jpg

100% Crop - http://images36.fotki.com/v1161/fileAsUa/ed98c/1/1452034/7149810/18mmf8crop1.jpg

29mm F2.8 1/250 Sec

FULL IMAGE - http://images32.fotki.com/v1108/filecbWy/ed98c/1/1452034/7149810/CameraTest011909004.jpg

100% Crop - http://images45.fotki.com/v1361/filefrf3/ed98c/1/1452034/7149810/29mmf2_8crop1.jpg

100% Crop #2 - http://images31.fotki.com/v1057/fileoffe/ed98c/1/1452034/7149810/29mmf2_8crop2.jpg

29mm F5.6 1/60 Sec

FULL IMAGE - http://images40.fotki.com/v1302/fileh0px/ed98c/1/1452034/7149810/CameraTest011909005.jpg

100% Crop - http://images38.fotki.com/v1216/filepykT/ed98c/1/1452034/7149810/29mmf5_6crop1.jpg

100% Crop #2 - http://images40.fotki.com/v1303/photos/1/1452034/7149810/29mmf5_6crop2-vi.jpg


29mm F8 1/45 sec

FULL IMAGE - http://images30.fotki.com/v481/fileDuPm/ed98c/1/1452034/7149810/CameraTest011909006.jpg

100% Crop - http://images40.fotki.com/v1339/fileb8ii/ed98c/1/1452034/7149810/29mmf8crop1.jpg

100% Crop #2 - http://images39.fotki.com/v1235/photos/1/1452034/7149810/29mmf8crop2-vi.jpg

29mm F11 1/15 Sec

FULL IMAGE - http://images35.fotki.com/v1163/filepX2B/ed98c/1/1452034/7149810/CameraTest011909007.jpg

100% Crop - http://public.fotki.com/kj1225/sharpness-test/29mmf11crop1.html

100% Crop #2 - http://images39.fotki.com/v1294/photos/1/1452034/7149810/29mmf11crop2-vi.jpg

38mm F2.8 1/250 sec

FULL IMAGE - http://images33.fotki.com/v1068/file6Tdl/ed98c/1/1452034/7149810/CameraTest011909008.jpg

100% Crop -http://images33.fotki.com/v1139/fileWY2Y/ed98c/1/1452034/7149810/38mmf2_8crop1.jpg

100% Crop #2 - http://images34.fotki.com/v1193/photos/1/1452034/7149810/38mmf2_8crop2-vi.jpg

38mm F5.6 1/45 Sec

FULL IMAGE - http://images32.fotki.com/v1063/file7jG0/ed98c/1/1452034/7149810/CameraTest011909009.jpg

100% Crop - http://images45.fotki.com/v1360/fileECX2/ed98c/1/1452034/7149810/38mmf5_6crop1.jpg

100% Crop #2 - http://images41.fotki.com/v1344/photos/1/1452034/7149810/38mmf5_6crop2-vi.jpg

38mm F8 1/30 Sec

FULL IMAGE - http://images33.fotki.com/v1136/fileVcn9/ed98c/1/1452034/7149810/CameraTest011909010.jpg

100% Crop -http://images35.fotki.com/v1210/filetzy4/ed98c/1/1452034/7149810/38mmf8crop1.jpg

100% Crop #2 - http://images45.fotki.com/v1421/photos/1/1452034/7149810/38mmf8crop2-vi.jpg

38mm F11 1/10 Sec

FULL IMAGE - http://images38.fotki.com/v1219/file7l6i/ed98c/1/1452034/7149810/CameraTest011909011.jpg

100% Crop - http://images42.fotki.com/v1435/fileq4O0/ed98c/1/1452034/7149810/38mmf11crop1.jpg

100% Crop #2 - http://images45.fotki.com/v1360/photos/1/1452034/7149810/38mmf11crop2-vi.jpg

50mm F2.8 1/180 Sec

FULL IMAGE - http://images42.fotki.com/v1434/filec7Fk/ed98c/1/1452034/7149810/CameraTest011909012.jpg

100% Crop - http://images42.fotki.com/v1436/fileUI55/ed98c/1/1452034/7149810/50mmf2_8crop1.jpg

100% Crop #2 - http://images43.fotki.com/v1437/fileLyEB/ed98c/1/1452034/7149810/50mmf2_8crop2.jpg

50mm F5.6 1/30 Sec

FULL IMAGE - http://images45.fotki.com/v1360/fileBwdS/ed98c/1/1452034/7149810/CameraTest011909013.jpg

100% Crop - http://images31.fotki.com/v1093/filencVc/ed98c/1/1452034/7149810/50mmf5_6crop1.jpg

100% Crop #2 - http://images32.fotki.com/v1063/file1xX9/ed98c/1/1452034/7149810/50mmf5_6crop2.jpg

50mm f8 1/20 Sec

FULL IMAGE - http://images41.fotki.com/v1340/filejKXH/ed98c/1/1452034/7149810/CameraTest011909014.jpg

100% Crop - http://images46.fotki.com/v1446/fileEafz/ed98c/1/1452034/7149810/50mmf8crop1.jpg

100% Crop #2 - http://images44.fotki.com/v1419/filey8Vq/ed98c/1/1452034/7149810/50mmf8crop2.jpg

50mm F11 1/8 Sec

FULL IMAGE - http://images43.fotki.com/v1439/fileG2kM/ed98c/1/1452034/7149810/CameraTest011909015.jpg

100% Crop - http://images35.fotki.com/v1206/fileFL3o/ed98c/1/1452034/7149810/50mmf11crop1.jpg

100% Crop #2 - http://images42.fotki.com/v1434/fileqAbm/ed98c/1/1452034/7149810/50mmf11crop2.jpg


There seems to be a good amount of vignetting at wider angles... is it something I should be worried about?

Thanks in Advance for the input!
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