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[B]IMAGE SHARPNESS
[/B]
When you put a lens designed for 35mm film on an APS-C digital camera, you normally expect to get a lens which doesn’t perform so well.
This is because approximately 63% of the imaging circle is being wasted.
However, this lens seems to be an exception. On 35mm-sized sensors, the corner softness of this lens is so bad, and affects such a large percentage of the imaging circle,
that there is actually an overall improvement when this lens is placed on an APS-C camera because the center of the lens is very sharp.
Also Read: [URL=https://ciberamerica.org/how-big-is-a-chunk-in-minecraft/][B]how big is a chunk in minecraft[/B][/URL]
Based on the dpreview test, wide open this lens gives an acceptable level of performance through most of the central part of the image.
In fact, if you cropped the image into a square, the majority of the square would be pretty sharp except for the extreme corners.
On the full 3:2 aspect ratio sensor, there is pretty bad corner softness outside the square area, but as long as you keep your main subject within the square, the important part of the image will be sharp enough. If you compose according to the Rule of Thirds, the subject will fall within the square.
In comparison, the Olympus 50mm lens is slightly sharper in the middle when wide open, and the sharpness is maintained through the entire area of the photo including the extreme corners.
This is an impressive performance, but it’s not really that important in real life situations where the corner area of the photo will be out of focus anyway because of these lenses’ shallow depth of field when used wide open.
preview also praised the Canon lens for having very little chromatic aberration, which is impressive for a $110 lens.
The Olympus also has very little chromatic aberration in the focal plane, but of course that’s what you’d expect for four times the price.
[B]BOKEH
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[B]The following image with this lens was taken with the Canon lens at f/1.8:
[/B]
[B]Source: Elliot Freeman
[/B]
The main problem with the bokeh is that the circles of light in the out-of-focus areas have slightly hard edges.
The bokeh becomes much worse when the lens is stopped down:
[B]Source: Gwen Harlow
[/B]
The pentagon shapes are a result of this lens’ cheap 5 blade aperture. You don’t get this problem when the lens is fully open,
because the aperture blades are fully retracted from the lens opening. Thus, you are better off using this lens wide open than stopped down a little bit.
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