FREE Photography Lens Optics and Selection Questions and Answers Flashcards
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Read the first 6 FREE Photography Lens Optics and Selection Questions and Answers flashcards as text
What does the term 'chromatic aberration' refer to in lens optics?
Answer: Color fringing caused by a lens failing to focus all wavelengths to the same point
Chromatic aberration occurs when a lens cannot converge different wavelengths of light to a single focal point, producing color fringes along high-contrast edges.
Which lens type is best suited for compressing the apparent distance between foreground and background elements?
Answer: Telephoto lens
Telephoto lenses compress perspective, making distant objects appear closer together and closer to the foreground subject.
What is the primary advantage of an aspherical lens element?
Answer: It corrects spherical aberration more effectively than a standard spherical element
Aspherical elements have a non-uniform curvature that corrects spherical aberration, which causes light rays hitting the edge of a lens to focus differently than those hitting the center.
A photographer needs a lens with a constant maximum aperture of f/2.8 across a zoom range of 70-200mm. What type of lens construction achieves this?
Answer: Internal zoom with a complex multi-group optical design
Constant-aperture zoom lenses use complex internal zoom mechanisms with multiple lens groups that maintain the same maximum aperture throughout the entire focal range.
What effect does a lens with a large number of rounded aperture blades have on out-of-focus highlights?
Answer: It produces smoother, more circular bokeh
More rounded aperture blades create a more circular opening, which renders out-of-focus highlights as smooth, round discs rather than harsh polygonal shapes.
What is 'focus breathing' in a lens, and when is it most problematic?
Answer: A shift in focal length when changing focus distance, most problematic in video work
Focus breathing is the change in apparent focal length as a lens shifts focus from near to far or vice versa, causing a zoom-like effect that is especially distracting in video footage.