I bought a EF-S 17-55mm from CP-M a few days ago. While testing it at home, I took some text near to the lens' minimum focusing distance (still able to AF confirm) and found that there is big amount of chromatic aberration (CA) at the edges of the image (yellow fringes on the left side of a letter and blue fringes on the right). In the centre, CA is less obvious but still visible. After correcting the CA in Camera Raw, the image appears to be sharp. Can anyone tell me if this behaviour is normal for this lens?
Please see the cropped images at 100% below. I have attached an image from the EF-S 18-55mm as reference. Compared to my 17-55mm lens, the kit lens seemed to exhibit no CA at all.
17-55mm @ 55mm f2.8
17-55mm @ 55mm f5.6
18-55mm @ 55mm f5.6
Would like to call out to anyone with the same lens to do the simple test too. Shoot some text and then 100% cropped out the text at the edge of the frame. Do post here if okay.
My main questions here will be:
1) Is this amount of CA acceptable for this lens?
2) Is my lens showing some signs of a bad copy?
3) If it's NO for the above, can I go back to CP for a 1-to-1 exchange since it's still within 7 days?
Thank you for your time.
Please see the cropped images at 100% below. I have attached an image from the EF-S 18-55mm as reference. Compared to my 17-55mm lens, the kit lens seemed to exhibit no CA at all.
17-55mm @ 55mm f2.8
17-55mm @ 55mm f5.6
18-55mm @ 55mm f5.6
Would like to call out to anyone with the same lens to do the simple test too. Shoot some text and then 100% cropped out the text at the edge of the frame. Do post here if okay.
My main questions here will be:
1) Is this amount of CA acceptable for this lens?
2) Is my lens showing some signs of a bad copy?
3) If it's NO for the above, can I go back to CP for a 1-to-1 exchange since it's still within 7 days?
Thank you for your time.
Do let me know. Thanks!
