LensRentals has loaned me a Hasselblad XCD 135mm f/2.8 lens for testing. Today I tested for focus curvature with the matched 1.7 X teleconverter (TC), using Roger Cicala’s (Ps>Filter>Stylize>Find Edges) test method. I found a flat surface with some texture, set the lens to wide open, and got this image:
In order to show the in-focus area, I brought the image into Photoshop, and selected Filter>Stylize>Sharpen Edges. That gave me this:
Very flat field.
Here are some images at closer distances:
Excellent performance here.
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