
Lenses 171
A Metabones E-EF Speed Booster turns a
70mm T2.8 into a 50mm T2 lens. The resulting
image coverage circle is smaller than the original
70mm lens, but that doesn’t matter if the com-
bination covers the format size of your camera.
Drawbacks of focal reducers can include
added distortion, chromatic aberrations, subtle
bokeh character differences, a different look to
the are,and increased vignetting in comparison
to the lens on a larger format sensor at maximum
aperture. Stopping down 1 or 2 stops can help
mitigate some of the issues.
Figure 7.86 Duclos 1.7x Expander.
Expanders are optical devices ...