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Lens Comparisons

Lens Comparisons. Stefano Prezioso. Lens Image Characteristics. Resolution (Sharpness) Distortion Vignette (Light Falloff) Chromatic Aberration. Resolution. How “sharp” the lens is Contrast Resolving Power of Detail Measured and Quantified in MTF Charts Lenses “Out Resolve” the Sensor.

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Lens Comparisons

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  1. Lens Comparisons Stefano Prezioso

  2. Lens Image Characteristics • Resolution (Sharpness) • Distortion • Vignette (Light Falloff) • Chromatic Aberration

  3. Resolution • How “sharp” the lens is • Contrast • Resolving Power of Detail • Measured and Quantified in MTF Charts • Lenses “Out Resolve” the Sensor

  4. Distortion • Three types • Pincushion • Barrel • Mustache • Most noticeable at edges/corners • Usually Correctable

  5. Vignette • Amount of Light Fall Off in Lens • Increases as Distance from Center Increases • Measured in Exposure Value (EV) Stops • Correctable in Post Processing

  6. Chromatic Aberration • Different Colors Converge at Different Points • Good Lenses are Corrected • Correctable in Post-Processing

  7. Nikon Brand Lens Candidates • Nikkor AF-S 14-24 f/2.8 G ED • Nikkor AF 14mm f/2.8 D ED • Nikkor AF-S DX 10-24mm f/3.5-4.5G ED • Nikkor AF-S 12-24mm f/4G IF-ED DX

  8. Sigma Brand Lens Candidates • Sigma EX 10-20mm f/3.5 EX DC HSM • Sigma AF 10-20mm f/4-5.6 DC EX HSM • Sigma AF 12-24mm f/4.5-5.6 EX HSM DG

  9. Tamron/Tokina/Samyung Lens Candidates • Tamron SP AF 10-24mm F/3.5-4.5 Di II LD Aspherical IF • Tokina AF 12-24mm f/4 AT-X Pro DX • Samyang 14 mm f/2.8 IF ED MC Aspherical

  10. Pricing Overview

  11. Resolution at f/8 14mm

  12. Bad Resolution Results • Nikkor AF 14mm f/2.8 D ED • Nikkor AF-S 12-24mm f/4G IF-ED DX • Sigma AF 10-20mm f/4-5.6 DC EX HSM • Tamron SP AF 10-24mm F/3.5-4.5 Di II LD Aspherical IF • Tokina AF 12-24mm f/4 AT-X Pro DX

  13. Distortion Results

  14. Chromatic Aberration Results

  15. Vignetting Results

  16. DxO Optics Pro 6 • Automatically corrects… everything. • Calibrated to specific camera and lens set up • Compatible with only certain lens/camera combinations • $169 for standard edition. EDU discount?

  17. Final Picks • Sigma 10mm-20mm f/3.5 • Distortion free from 14mm-20mm • Sharp • Decent CA and Vignetting Characteristics • Samyang 14mm f/2.8 • Super Sharp • Perfect CA Characteristics • Bad Distortion and Vignetting

  18. Surprise Lens • Sigma 14mm f/3.5 • Older Lens (Replaced by f/2.8 version) • No Profiles for Corrections (To my knowledge) • Sharp, Good Distortion Characteristics • Long Term Loan… Free

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