the last word

Here’s another try at an informal test of the Nikon 500mm f/5.6 phase Fresnel lens compared to the Nikon 180-400mm f/4 zoom. Here’s the scene with both lenses, with the zoom set to 500mm by switching in the built in teleconverter and setting the lens to 360 mm.. I made the shots at sunrise to… [Read More]

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]