Questions tagged “lens testing”

Ask the Unique Photo creator community — gear, technique, post-processing and more.

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Why would a fisheye lens test sharper at the edges than in the center?

sony fisheye lens-testing sharpness mtf

Photography Stack Exchange contributor

4y ago

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Why are my teleconverter test shots soft, and how should I test lens sharpness properly?

tripod lens-testing sharpness teleconverter manual-focus

Photography Stack Exchange contributor

6y ago

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Why do DxOMark corner-sharpness results differ between Canon- and Nikon-mount versions of the Sigma 24mm f/1.4 Art?

sigma lens-testing wide-angle sharpness canon-vs-nikon

Photography Stack Exchange contributor

7y ago

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219

How can I properly test whether a lens is decentered, and do these corner crops indicate a problem?

samyang lens-testing wide-angle decentering sharpness

Photography Stack Exchange contributor

7y ago

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194

How can I test a camera or lens at infinity focus in a small room?

lens-testing optics focus infinity-focus image-quality

Photography Stack Exchange contributor

8y ago

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How can I test sharpness across the full field of a 180° fisheye lens?

fisheye vignetting lens-testing sharpness mtf

Photography Stack Exchange contributor

8y ago

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Do these FoCal results suggest a Canon 70-200mm f/2.8L IS II has an astigmatism or alignment problem?

autofocus canon lens-testing telephoto-lenses lens-repair

Photography Stack Exchange contributor

8y ago

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How can I tell if my Pentax DA 18-135 is defective or just soft at some settings?

lens-sharpness lens-testing focus zoom-lens pentax

Photography Stack Exchange contributor

10y ago

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113

How can I determine the actual f-number of an unmarked aperture stop on a manual lens?

aperture lens-testing manual-focus-lenses canon-fd exposure

Photography Stack Exchange contributor

10y ago

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Why can the same lens score much lower on a newer camera body in DxOMark tests?

micro-four-thirds dxomark lens-testing sharpness camera-comparison

Photography Stack Exchange contributor

10y ago

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133

Why can the same lens show different vignetting on different camera sensors?

sony-a-mount sensor vignetting lens-testing wide-angle

Photography Stack Exchange contributor

11y ago

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107

How can I tell if a new lens is a genuinely bad copy?

warranty lenses lens-testing sharpness image-quality

Photography Stack Exchange contributor

11y ago

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108

How can I create consistent sample photos to compare cameras or lenses?

distortion lens-testing technique camera-comparison image-quality

Photography Stack Exchange contributor

12y ago

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How can I measure lens vignetting without special equipment?

vignetting lens-testing optics diy measurement

Photography Stack Exchange contributor

12y ago

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118

How can I properly compare two lenses at home?

lens-comparison 50mm lens-testing sharpness image-quality

Photography Stack Exchange contributor

13y ago

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How can I check whether my lens was damaged after bumping it into a window?

canon point-and-shoot lens-testing lens-damage image-quality

Photography Stack Exchange contributor

13y ago

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205

Why do MTF charts use 10 lp/mm for contrast and 30 lp/mm for resolution?

lenses resolution lens-testing contrast mtf

Photography Stack Exchange contributor

13y ago

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136

How do MTF50 measurements compare with a manufacturer's MTF chart?

canon lens-testing sharpness mtf image-quality

Photography Stack Exchange contributor

13y ago

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What does lens centering quality mean?

lenses lens-testing optics sharpness

Photography Stack Exchange contributor

14y ago

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Can DxOMark lens scores be compared across camera systems?

lenses buying-advice camera-systems dxomark lens-testing

Photography Stack Exchange contributor

14y ago

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