Archives for 2017

This is the eighth in a series of posts about the Voigtlander 65 mm f/2 Apo-Lanthar macro lens. The series starts here.  In this post, I showed 65 mm f/2 Apo-Lanthar center and corner performance at f/2 and at a 1:2 reproduction ratio. Unsurprisingly, the corners were slightly softer than the center. I have improved my… [Read More]

There have been complaints about the shutter lag of the Sony a7RII and the a9. Independent tests have measured their shutter lag, defined as the elapsed time between the depression of the shutter release and the beginning of the opening of the first curtain of the shutter, to be quite low. I wondered if the issue that… [Read More]

This is the seventh in a series of posts about the Voigtlander 65 mm f/2 Apo-Lanthar macro lens. The series starts here.  I’ve been asked about the Voigtlander 65 mm f/2 Apo-Lanthar’s longitudinal chromatic aberration (LoCA) and focus shift at 1:2 reproduction ratio. I made a series of exposures at each whole f-stop from f/2 through… [Read More]

For the last few posts, we’ve been looking at reflections introduced by adding UV filters to a Zeiss Otus 55 mm f/1.4 lens on a  Sony a7RII.  We’ve seen that all the tested UV filters cause reflections, that the detailed nature of the reflections (but not their position) changes with the brand of filter,  and that the… [Read More]