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Diglloyd Making Sharp Images articulates years of best practices and how-to, painstakingly learned over a decade of camera and lens evaluation.
Save yourself those years of trial and error by jump-starting your photographic technical execution when making the image. The best lens or camera is handicapped if the photographer fails to master perfect shot discipline. High-resolution digital cameras are unforgiving of errors, at least if one wants the best possible results.
Intrigued? See Focusing Zeiss DSLR Lenses For Peak Performance, PART ONE: The Challenges, or (one topic of many) field curvature.
Getting peak performance from your lens
Zone of focus, not plane of focus
Actual example of field curvature.
Elusive sharpness, depending on aperture
Focus shift with a variety of lenses.
Understanding resolution and contrast graphs.
Understanding the various optical aberrations and behaviors.
Evenness of illumination across the frame and related effects.
Diffuse haze at wide apertures.
Understanding lateral chromatic aberration (color fringing).
Understanding Longitudinal (Axial) chromatic aberration (LOCA).
Secondary Longitudinal Chromatic Aberration (SLOCA).