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]
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Nikon 500/5.6 PF on Nikon Z7
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]
Fuji 50/3.5 on GFX100, Sigma 35/1.2 on a7RIV
It’s a nice still morning, so I thought I’d test the new Fuji 50 mm f/3.5 on some foliage. For comparison, I chose the excellent Sigma 35 mm f/1.2 Art lens on a Sony a7RIV. Here’s the scene: Making three shots for each variation and picking the sharpest, I exposed at base ISO 100… [Read More]
Balancing real and fake detail — part 2
This is the second post on balancing real and fake detail in digital images. The series starts here. In the last post I looked at the amount of aliased and correctly reconstructed image detail in the case of a monochromatic sensor an ideal lens, in combination with some spherical aberration and defocusing. The calculations assumed… [Read More]
Nikon 24-70/2.8 S on Z7, Fuji 32-64/4 on GFX 100
This is one in a series of posts on the Nikon Z6 and Z7. You should be able to find all the posts about those cameras in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this… [Read More]
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