Digital camera review : Canon A710 IS's tunnel style coupled real-image optical viewfinder is sharp, fairly bright, and imminently useable - but it is a little squinty and only covers a bit more than eighty percent of the image frame. There’s no diopter adjustment for eyeglasses wearers.
The A710 IS’s 2.5" low-resolution (115,000 pixels) TFT LCD screen is a bit grainy, but it is relatively sharp, bright, hue (color) correct, and fluid. It automatically boosts gain in dim/low light and provides a very useful playback histogram display that converts the image area into a graphic readout of the tonal distribution in captured images.
Zoom:The A710 IS features an f2.8-f4.8/5.8mm-34.8mm (35-210mm 35mm equivalent) all glass 6X zoom. When the camera is powered up the lens extends automatically and when the camera is powered down the zoom is fully retracted into the camera body and a built in iris style lens cover closes to protect it.The A710 IS’s zoom exhibits moderate barrel distortion (straight lines bow out from the center) at the wide-angle end of the zoom range, but there is no visible pin cushioning (straight lines bow in toward the center) at the telephoto end of the zoom. There is some very minor softness in the corners, but no visible vignetting (dark corners). Chromatic aberration (purple fringing) is well controlled, but visible in high contrast color transition areas. The A710 IS’s zoom is relatively fast and fairly quiet.
Auto Focus (AF):
The A710 IS features the same dependable TTL Contrast Detection 9 focus point AiAF (Advanced intelligent Auto Focus) system as Canon’s other digicams. In all automatic exposure modes the camera defaults to the AiAF system which analyzes the scene in front of the camera and then calculates camera to subject distance to determine which of the 9 AF points is closest to the primary subject and then automatically locks focus on that AF point (closest subject priority), even when the subject is not centered in the viewfinder. Users can also turn off the AiAF and default to the center focus point for classic portraits or traditional landscapes. In aperture priority, shutter priority, and manual mode, the A710 IS utilizes Canon’s proprietary Flexizone AF which defaults to the center focus point or permits users to manually shift that AF point around the central two thirds of the frame for maximum compositional control.
The A710 IS also provides auto focus bracketing (AFB). With a single push of the shutter button, the camera captures three exposures in rapid succession marginally shifting the focus for each (one just slightly in front of the optimum focus point, one at the optimum focus distance, and one just slightly behind the optimum focus point), virtually guaranteeing at least one correctly focused image, even in tricky lighting. The focus distance interval can be adjusted, allowing for exact spacing and precise focus no matter what sort of image is being shot. The A710 IS's auto focus is very fast and consistently accurate, essentially real time with pre-focusing and almost instantaneous from scratch.
The A710 IS features the same dependable TTL Contrast Detection 9 focus point AiAF (Advanced intelligent Auto Focus) system as Canon’s other digicams. In all automatic exposure modes the camera defaults to the AiAF system which analyzes the scene in front of the camera and then calculates camera to subject distance to determine which of the 9 AF points is closest to the primary subject and then automatically locks focus on that AF point (closest subject priority), even when the subject is not centered in the viewfinder. Users can also turn off the AiAF and default to the center focus point for classic portraits or traditional landscapes. In aperture priority, shutter priority, and manual mode, the A710 IS utilizes Canon’s proprietary Flexizone AF which defaults to the center focus point or permits users to manually shift that AF point around the central two thirds of the frame for maximum compositional control.
The A710 IS also provides auto focus bracketing (AFB). With a single push of the shutter button, the camera captures three exposures in rapid succession marginally shifting the focus for each (one just slightly in front of the optimum focus point, one at the optimum focus distance, and one just slightly behind the optimum focus point), virtually guaranteeing at least one correctly focused image, even in tricky lighting. The focus distance interval can be adjusted, allowing for exact spacing and precise focus no matter what sort of image is being shot. The A710 IS's auto focus is very fast and consistently accurate, essentially real time with pre-focusing and almost instantaneous from scratch.
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