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Testing the Nikon 400mm f/2.8G VR
I got my hands on a brand new Nikon 400mm f/2.8G VR that I have been testing for the last week or so. This weekend I am heading out to Yellowstone to shoot bears, wolves and whatever else I might...
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Michael Tapes Design releases FocusTune Focus Calibration software
Michael Tapes Design, maker of the highly acclaimed LensAlign Focus calibration system, has announced FocusTune, The Auto-Focus Software Solution for correcting DSLR body/lens mismatch errors and...
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Image Degradation with Nikon Teleconverters
A fellow photographer recently asked me how much image degradation one would see with each Nikon teleconverter. As a nature photographer, I have been wondering myself about this for a while, but never...
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How to Read MTF Charts
When my article on field curvature was published a while ago, where I talked about how one could do a quick analysis of lens MTF data and determine if it exhibits any field curvature, some of our...
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What is a Decentered Lens?
A decentered lens contains one or more optical lens elements that are either moved or tilted from the principal axis of the lens. Such shifting or tilting of lens elements can potentially lead to...
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Glass vs Resin Filters – Are There Any Differences in Sharpness?
Landscape photographers often deal with the dilemma of choosing between different types and brands of neutral density and graduated neutral density filters for use in high-contrast situations such as...
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