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Schneider PC-TS 90/45  
Schneider PC-TS 90/45

Diffraction from f/4.5 - f/32, 90/4.5

The beauty of using tilt is that no resolution is lost to diffraction. For more on diffraction, see Making Sharp Images.

On the Nikon D3x, the negative effects of diffraction being to subtly appear by f/8, and there are clear losses of contrast by f/11 (with a high quality lens). MTF charts always show this clearly.

The deconvolution sharpening used here minimizes the sharpness losses from diffraction, so the crops shown are about as good as one can expect with the best sharpening technique.

The tilt function can help evade the image-degrading effects of diffraction: appropriate tilt can allow use of f/5.6 instead of f/16 or f/22, at least with some subjects where the wedge of sharpness achievable by tilt “fits” the subject matter.

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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Using tilt (swing) to isolate the blue bicycle 
Click to view actual pixels aperture series

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