In the context of photography, eyepieces typically refer to the viewfinder parts in cameras—especially in DSLRs and other cameras with optical viewfinders—and not directly to the lenses attached to cameras. However, if by “eyepieces” you mean the quality of the viewfinder or a similar component used for framing and focusing, then yes, they do matter. Here’s why:
Composition: An eyepiece or viewfinder helps the photographer frame the scene to be captured. The clarity, size, and coverage of the viewfinder can greatly affect how effectively you can compose your shots.
Focusing: High-quality viewfinders, especially optical ones, can help with manual focusing by providing a clear and detailed view of the scene. Some electronic viewfinders (EVFs) in mirrorless cameras also offer focus aids like peaking to assist in achieving sharp focus.
Exposure and Settings Feedback: Many advanced cameras display exposure settings and other shooting information in the viewfinder. This makes it easier for the photographer to adjust settings on the fly without needing to look away from the eyepiece.
Stability and Ergonomics: Looking through a viewfinder can offer more stability than using an LCD screen because the camera is closer to the body. This can reduce camera shake, which is particularly helpful in low-light conditions or when using longer lenses.
Battery Life: On some cameras, using the viewfinder instead of the LCD screen can prolong battery life because the main screen is often one of the largest energy consumers.
Therefore, while many modern cameras allow for composition via the rear screen or a live view, the eyepiece or viewfinder remains a key component for many photographers who value accuracy, stability, and direct engagement with their frame. The type and quality of the eyepiece can impact both the shooting experience and the results, making it a significant consideration depending on the camera’s design and the photographer’s preferences.