EXCERPT page containing first few paragraphs. 2019-09-19 15:12:34
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This series shows some highly unusual behavior for out-of-focus specular highlights, using night-time conditions.
Update: while I have not personally confirmed it, my information is that a firmware update delivers circular bokeh at full aperture.
Out of focus lights
The Hasselblad XCD 90mm f/3.2 is quite unusual in one of its behaviors: wide open at f/3.2 (or f/3.5 for the XCD 45/3.5), the lens diaphragm is already stopped down (this can be seen and heard using the depth of field preview button). This behavior makes it impossible to obtain smooth rounded-out of focus blurs for specular highlights, unlike nearly all other lenses. It is a meaningful consideration for anyone used to shooting wide open for blur effects. See the blurs below from f/3.2 through f/6.3 with the unattractively asymmetric combination of spherical on one side and straight-blade lens diaphragm on the other. Even at f/9 the blurs in the extreme corners are not symmetric.
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