The picture resolution situation is also typical for this lens class. The picture resolution is very good at the lowest focal length in both the center and the edge of the frame even with the open aperture. As the focal length increases, the situation becomes worse, which is a result of the weak aperture. At the 200 mm focal length, the aperture is f/5.6. We noticed that for many lenses this aperture gives the highest picture resolution. For the Canon 100-300 mm this situation is not possible since this is the maximum aperture the lens reaches and all kinds of optical aberrations are present. These aberrations influence the picture resolution at f8.0 as well, so the lens’s results are weak here too. The f/11 diaphragm minimizes the apertures to an acceptable level but here, for a change; the resolution is restricted by the diffraction. At 200 mm and 300 mm the lens seems like it has no chance to succeed.
As far as the behavior at the edges of the frame is concerned, only at 100 mm are the results good. At 200 mm and 300 mm the lens’s results are not even close to the acceptable value of 30lpmm. The 200 mm test results could be accepted but the results for the 300 mm are very weak. However, we have to honestly admit that the competition does not have better results in this category.
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