Since the film era, both Canon and Nikon have offered a line of lenses aimed at professional photographers and amateurs with similar intent and deep pockets. One of the hallmarks of those lens lines was a constant (unchanging with focal length in zoom lenses) aperture of f/2.8 or faster. There’s the f/2.8 standard zoom trio:… [Read More]
Archives for 2015
How I’m doing
I posted here about my brain surgery last month and the recovery. Thanks to all who commented on the blog and sent emails. I deeply appreciate your good wishes. I’m doing much better now. I can get around with a cane — the walker is gathering dust – which means I have a free hand… [Read More]
Nontechnical summaries to technical posts?
A reader sent me the following suggestion: You may wish to consider including (as a regular feature) within some of your more technically related posts (i.e.- Nov. 24th: “Sony a7II, a7RII high-ISO spatial filtering”) an included short paragraph – at the bottom of the more technically related posts (and maybe titled something like: “Practical Implications… [Read More]
Sony a7II, a7RII high-ISO spatial filtering
In several recent posts, there were reductions in dark-field noise at high ISOs with the a7II and a7RII that I attributed to in-camera processing. Spectral analysis of the images confirms this. For the a7II, on both sides of the transition point: fs is the sampling frequency. Values from dc to the Nyquist frequency are plotted… [Read More]
Achieving artistic maturity
Last Saturday night, my wife and I went to dinner with two artists who were in town for a workshop (My recovery has progressed to the point where I can now get around with a cane.) She’s a watercolorist; he works with oils. She asked an interesting question, which I will paraphrase as: “How does… [Read More]
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