LensRentals has loaned me a Hasselblad XCD 55mm f/2.5 V lens for testing. I haven’t noticed much longitudinal chromatic aberration (LoCA) when testing this lens. Still, I thought it worthwhile to try a quick and dirty LoCA test: branches against the sky. All shots made with the lens wide open and ISO 64. The scene:… [Read More]

LensRentals has loaned me a Hasselblad XCD 55mm f/2.5 V lens for testing. Last night I tested for distortion, on an image developed in Lightroom with lens compensation enabled. The blue line I added in Photoshop so that nonlinearity would be more apparent. THis loks very good. Here’s an image with the y dimension expanded… [Read More]

LensRentals has loaned me a Hasselblad XCD 55mm f/2.5 V lens for testing.  I needed some banners for a newsletter I’m working on, so I took the XCD 55V out for a ramble. I stayed away from the nosebleed shutter speeds where the mechanical shutter of the lens gives, um, unusual bokeh. I shot wide… [Read More]

LensRentals has loaned me a Hasselblad XCD 55mm f/2.5 V lens for testing.  Today I tested for focus curvature, using Roger Cicala’s test method. I found a flat surface with some texture, set the lens to wide open, focused about 5 meters away, and got this image: In order to show the in-focus area, I… [Read More]