![]() Phase-detect Autofocusīy way of explanation, the phase-detect/contrast-detect distinction is one of the fundamental differences that separates digicams from digital SLRs, and is the core reason that SLRs focus more quickly. This is a fairly radical difference, compared to other camera makers. The D3100's only option for autofocus in Live view mode is contrast detection. Like the D5000, the Nikon D3100 has only one type of autofocus method in Live view, and it's not the traditional phase-detect AF. One thing we miss in the Nikon D3100, though, is the live histogram display that's an option on the Nikon D3 and on some competing SLRs from Nikon's arch-rival Canon. There's also an optional grid overlay mode, as well as a second info overlay that only shows basic exposure variables. It also shows microphone status and minutes/seconds of movie recording available at the current resolution and quality settings. Information displayed includes current exposure mode, flash mode, AF mode, AF-area mode, Active D-Lighting mode, image size, image quality, white balance mode, metering mode, shutter speed, aperture, exposure compensation, ISO setting, shots remaining, face detection status, battery status, and self-timer mode. ![]() The Live Mode shooting info display shows you a lot of what you'd normally see looking through the viewfinder, yet manages to keep most of the information out of the way of the live image area. ![]() Another nice feature in the Nikon D3100's Live view mode is the full information display optionally available while working in that mode. ![]()
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