Archives for February 8, 2020

Here’s another informal test of the Nikon 500mm f/5.6 phase Fresnel lens. This time I compared it to the excellent Nikon 180-400mm f/4 zoom. There are two problems with this test, but I’m publishing it anyway. Here’s the scene with both lenses, with the zoom set to 500mm by switching in the built in teleconverter… [Read More]

Here’s an informal test of the Nikon 500 mm f/5.6 phase Fresnel lens on a Nikon Z7. Here’s the scene, with the blooming bay tree target about 30 meters away: Note the minimal illumination falloff. Making three shots for each variation and picking the sharpest, I exposed at base ISO 100 for both cameras.  I… [Read More]