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Nikon 12-24 f/4G ED-IF AF-S DX Zoom-Nikkor
Hot spots mar an otherwise fine performance with a near absence of backfocus at f/4. Stopping down to f/5.6 improves contrast substantially across the entire frame. Though focus is accurate at f/4, stopping down to f/5.6 brings increased contrast that looks much more crisp, even though the resolution is unchanged in the center.
Nikon 12-24 f/4G Hot spots
Hot spots behavior is troublesome by f/8, and can be a problem a even at f/5.6. Fortunately, the 12-24 is a high performer by f/5.6.
Nikon 12-24mm f/4 backfocus
The 12-24 DX offers a near-exemplary performance in terms of focusing accuracy. The f/4 maximum aperture inherently compensates with its significant depth of field, four times that of an f/1.4 lens at f/1.4, but there is no disputing the focus accuracy.
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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.
The coverage explains all the issues involved in shooting for monochrome and in infrared. It is not a review of any particular camera or lens, though many examples are included.
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View an overview of infrared as well as filter spectral transmission plus examples from an optimal lens.