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Technical specs: 24-70/2.8L II vs 24-70/4L IS
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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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
- Make better images by learning how to get the best results right away.
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- Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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