In the previous post, I compared the performance at 200mm of the Sony 70-200mm f/4 G OSS FE to the Nikon 70-200 f/2.8 GII ED, with both lenses used on a Sony a7RII camera. In this post, I’ll do the same for the case when both lenses are set to 70mm. The overall scene: … [Read More]
70-200’s: Nikon f/2.8, Sony f/4 @ 200mm
A reader commented that the Nikon 70-200 f/2.8 GII ED is a superior lens to the Sony 70-200 f/4 G OSS FE. In fact, he went so far as to say: The OSS 70-200 is not a very good lens and doesn’t compare to the Nikon 70-200 2,8 in any way that I could tell…. [Read More]
Does reducing a7RII ISO decrease AF accuracy?
A reader asked the following: …did you find that AF focusing in the dark conditions with a nominal ISO locked @ ISO100 works worse than ISO for example being way higher ? Good question. Only one way to find out. Start with an a7RII and a Sony 90mm f/2.8 macro lens. Proceed as follows: RRS… [Read More]
Sony a7RII zebras
There’s a maxim in medicine: “If you hear hoofbeats, think horses, not zebras.” It means look for the most common maladies first. I’ve always liked that rephrasing of Occam’s Razor. What’s that got to do with today’s topic, which is using the zebra viewfinder display option in the Sony alpha 7R Mark II (a7RII to… [Read More]
More on read noise and quantizing
A reader commented on the previous post: The real tough part of posterization is when a gradient is colored and you get hue shifts as the color channels step across bins individually. Can you redo this test with a color gradient, like maybe 0.6 0.8 1.0 relative values to the channels? Pleased to do so…. [Read More]
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