A reader chided me for not using the same methodology when testing my copy of the Fujifilm GF 100-200 and another reader’s copy. To review, I tested my copy with a very complicated program that analyzes stacks of focus bracketed images, white balances the raw MTF curves, fits curves to critical measures, and calculates metrics… [Read More]
Sample variation in the Fujifilm GF 100-200 at 200mm
When I measured the performance of the GF 100-200mm f/5.6 lens at 200 mm, I got good, but not great results. In fact, it was about the weakest performance I’ve seen with the excellent line of GF lenses. Ever since I published those results, people have been saying that their copy of the GF 100-200… [Read More]
The GF 100-200, the blind men, and the elephant
In Buddhist, Hindu, and Jain tradition, there is a parable that goes something like this: A group of blind men heard that a strange animal, called an elephant, had been brought to the town. None of them were aware of its form. They said: “We must know it by touch, of which we are capable”…. [Read More]
FF equivalent focal lengths of Hasselblad XCD, Fuji GF lenses
The question of equivalent full frame focal lengths of the Fujifilm GF and Hasselblad XCD lenses comes up over and over. I thought I’d post that information here, and then I can link to it when the topic comes up again. There are three common ways to calculate equivalent focal lengths: by sensor width, by… [Read More]
Effect of camera resolution on small prints
There was recently a question thrown out on a public forum that I’ll paraphrase and make more specific here: “How big do you have to print before you can see the difference between the GFX 50x and GFX 100x cameras?” My answer: The pixel aperture of the GFX 100x and GFX 50x is the same… [Read More]
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