EXCERPT page containing first few paragraphs. 2021-12-04 02:55:45
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Further below are compared the technical details of the two lenses.
Some quick comparative points—
- The image stabilization of the f/4 lens might appeal, but consider that f/4 will already be affected by diffraction on future 40+ megapixel camera bodies.
- At f/4, there is very little vignetting with the f/2.8L II; the f/4L IS shows more vignetting wide open at f/4. Thus the effective brightness at f/4 is more than a stop faster for the f/2.8L II.
- An f/2.8 aperture is useful for more than just speed: for effect. Also, at f/4, the illumination over the frame at f/4 is much mor even with the f/2.8 lens.
- Focusing at f/4 under dim conditions is more difficult, and more ambiguous also (too much depth of field).
- An extra stop and proper handholding technique can do wonders for image sharpness. See Making Sharper Images.
- Field shooting shows clearly that the f/2.8 lens has much better control over color aberrations.
- Both lenses extend excessively when zoomed.
- In practice, the lenses don’t feel all that different in heft, but there is a noticeable different in size and weight when using the f/2.8 lens.
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