genji Offline Upload & Sell: Off
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Fred Miranda wrote:
I'm confident on my copy since it's symmetric at f/1.5 but it's hard to be sure if it performs optimally at all distances unless comparing it to at least 2 or 3 copies.
When using the CV 75/1.5 on the Sony, field curvature could be a negative for landscapes at "wide apertures". (f/4 already masks its effect)
However, with portraits, field curvature is not as relevant with the subject off-axis because we would be focusing on that area. I still don't know for sure if the FC is a characteristic of the lens. The only way to know for sure is to test it on a Leica or modified Sony. It's also not clear if Voigtlander will produce this lens for the E-mount....Show more →
I tested my copy of the CV 75/1.5 on an infinity scene with my Leica M10-P yesterday afternoon and found it has essentially a flat field. Using the Leica Visoflex 020 external EVF, I focused on the center of the scene (which was at the hard infinity stop) and took exposures at f/1.5, f2.0, and f/2.8. I then moved the focusing point left to the mid-zone, re-focused (again the sharpest focus was at the hard stop) and made another three exposures. Finally I moved the focus point as close to the left edge as possible, refocused (hard stop once more) and made a final three exposures. Naturally, since the focus hadn’t changed, the center images wide open were identical, as were those at the mid-zone and near-edge. I just checked by focusing on a different infinity subject and best focus is achieved wide open at center, mid-zone, and near-edge at the hard infinity stop in all three cases. I’ll post the results here (if that’s appropriate) and in the First Impressions thread as soon as I’m able.
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