Lens Specifications Quiz – Understand MTF Charts, Aperture, and More

Lens spec sheets are packed with numbers and charts that can be confusing. Test your understanding of MTF charts, aperture markings, filter threads, lens coatings, and the specifications that truly matter for image quality.

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Lens Specifications Quiz

What does an MTF (Modulation Transfer Function) chart measure?

On an MTF chart, what does it mean when the lines are high and close together?

What does the 'filter thread size' (e.g., 67mm, 77mm) indicate on a lens?

What is the purpose of multi-coating on lens elements?

What do the numbers on a variable aperture zoom lens like '18-55mm f/3.5-5.6' mean?

What does 'ED' or 'LD' glass in a lens designation indicate?

What is chromatic aberration, and how does it appear in photos?

Why is the number of aperture blades relevant to image quality?

What does 'internal focusing' mean, and why is it desirable?

What is vignetting, and when is it most noticeable?