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Aperture and Shutter Speed

The Four Thirds and Micro Four Thirds formats differ in the flange to lens distance, but otherwise are identical. The discussion that follows is thus applicable to both.

When discussing lens speed (aperture or f-stop, strictly speaking, T-stop), one can fall into the trap of concluding that the Four Thirds format offers a shutter speed advantage in this way:

(FALSE idea) “I can shoot a 150mm f/2 that is equivalent to a 300mm f/2.8 on full frame, therefore I have a full shutter speed advantage”.

Now consider a full-frame 35mm DSLR having exactly the same pixel density as a Four Thirds camera (photosites are the same size). This DSLR would have about 4X the total megapixels. Then assume this DSLR also has a “4/3 crop mode” similar to the DX crop mode on Nikon DSLRs, which crops the frame to Four Thirds format.

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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.

Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.

  • Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
  • Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
  • Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
  • 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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