Review on Ultra Wide Angle Zoom Lens for SLR Cameras - Canon EF 17-40mm f/4L USM by Candra ᠌

When I shoot, I use a Canon 400D and I make sure that the software sharpening is turned off. And everything is perfectly clear even at the highest possible resolution of 10 megapixels. When compared to film photography, digital photography is an abomination, and the primary reason for this is the excessive use of software sharpening. But you won't be able to turn off every lens's illumination. And you are able to do so with this. The photo looks very much like it was scanned from a film. When using a crop factor of 1.6, there is almost no loss in sharpness at the image's edges. This is because the sharpness at the image's edges begins to decline just in the portion of the field of view that does not work when using the crop factor. Chromatic aberration is only detectable at a focal length of 17 millimeters in certain regions of the image's short edges and in the corners. And this is if you shoot trees with small branches at full resolution of 10MP against the background of the sky so that branches one, two, or three pixels wide are present and take a very close look at the enlarged image. This is the case if you do this. It is true that the sharpness of the lens is such that, with the software sharpening turned off, you are able to see clearly branches on a tree that are only 1-2 pixels thick using the lens alone. If you take a picture of a landscape in such a way that the sun is visible in the frame, then there won't be any glare or bunnies in the picture; instead, the picture will be cloudier because of the sun's diffuse reflection of light. I do not recommend it for full-frame photography with a resolution that is significantly higher than 12 megapixels. Since the full format has larger pixels than the crop does at a resolution of 12 megapixels, the described distortions will only be slightly more noticeable there than they are on the crop.