Although the pixels on the LCD do not correspond exactly to those in the picture, the actual magnification is quite ample. On the Canon XTi (400D), for instance, the screen measures 4 x 5 cm (not the same aspect ratio as the picture), and the maximum magnification is x 10 (relative to showing the whole picture on the screen). That means the maximum magnification is like looking at a 16 x 20-inch (40 x 50-cm) enlargement.
You can connect a video cable to almost any DSLR (Canon, Nikon, or others) and see its LCD display on a bigger screen. DSLRs and other digital cameras can be set to produce NTSC (American) or PAL (British) video signals.
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