FREE Photography Lens Optics and Selection Questions and Answers Flashcards
6 cards from real Photography practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 FREE Photography Lens Optics and Selection Questions and Answers flashcards as text
What does the 'minimum focus distance' specification of a lens determine?
Answer: The closest distance at which the lens can achieve sharp focus on a subject
Minimum focus distance is measured from the camera's sensor plane to the nearest point at which the lens can produce a sharp image of the subject.
Why might a photographer choose a lens with fluorite or ED (Extra-low Dispersion) glass elements?
Answer: To reduce chromatic aberration and improve color accuracy
Fluorite and ED glass elements have special optical properties that minimize chromatic aberration by bringing different wavelengths of light closer to a common focal point.
What is the relationship between a lens's focal length and its angle of view on a full-frame sensor?
Answer: Longer focal lengths produce a narrower angle of view
As focal length increases, the angle of view narrows, which is why telephoto lenses see a smaller portion of the scene compared to wide-angle lenses.
A lens is described as having a 'rectilinear' design. What does this mean for the images it produces?
Answer: Straight lines in the scene are rendered as straight lines in the image
Rectilinear lenses are optically corrected so that straight lines in the real world appear straight in the photograph, unlike fisheye lenses which curve them.
What is the practical benefit of a lens with internal focusing (IF)?
Answer: The front element does not rotate or extend during focusing, making it easier to use filters and lens hoods
Internal focusing keeps the physical length of the lens constant and prevents the front element from rotating, which is essential when using polarizing filters or petal-shaped lens hoods.
When comparing two lenses with the same focal length, what does a higher MTF (Modulation Transfer Function) chart score indicate?
Answer: The lens resolves finer detail and produces sharper images
MTF charts measure a lens's ability to reproduce fine detail and contrast, with higher values indicating superior optical sharpness and resolution.