The 25mm f/2.8 is a gem, though it has some drawbacks one has to be aware of for certain application:
- The maximum aperture of f/2.8 can be somewhat more difficult to work with in low light than its ƒ/2 sibling.
- It has more distortion than desirable for architectural work, along with a “wave” to it rather than a gently-sloping falloff;
- It has some lateral chromatic aberration visible on high-contrast edges;
- Its close-focusing optical performance is not well corrected (possible creative uses for very close range).
- It is closer to 26mm than 25mm (25.7mm exactly).
All of these issues were at first discouraging, a viewpoint that the I have now completely reversed: in spite of these issues, the 25mm is an admirable performer when used to make real images, offering a combination of imaging properties that rarely disappoint when taken as a whole. Generally speaking, this is due to high lens contrast, particularly at infinity focus.
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Observe the nice differentation of foliage of the Zeiss image, and a pleasing overall vibrance