Size and weight
Less expensive cameras tend to be smaller and lighter, even though, as any digital SLR camera is going to keep in your pocket in any case, the size is not of primary importance.
Pixel
rebel2 SLR Digital 6 mega-pixel (MP) and can be as much as the PM 22 for a premium. Pixel determines the print size can be blown and you need to decide the size you want your photos before you decide on which model to buy. 240 pixels per inch gives good print quality in order to 6 MP camera will be sufficient to ensure a high quality 8 "x 10" print.
If you need large prints 10 MP camera will produce a good impression to a size 11 x 14. A high-end camera with a pixel 22 MP give excellent 11 x 14 prints.
ISO settings
ISO ranges from 100 to 1600 are lower than most cameras. Mid range cameras have settings in May 6400 and a high-end device can reach up to 25,500 and the lowest 50th Most digital SLR camera provides images with low noise at ISO 100 to 800, but the noise increases dramatically over that. The noise at higher levels can vary considerably between models, if possible, try to see the pictures taken at the most, with cameras that are being taken into account.
Noise
All digital images have some noise to be more sensitive at high ISO. The noise from sensors and electronics, where the digital signal is produced by the analog signal. All digital SLR cameras equipped with systems for filtering noise, but works less well on a setting of ISO 800. Noise reduction smooths the image to try to see the pictures taken in low light, if you use the higher ISO range.
Autofocus
Autofocus systems vary considerably among producers. All systems of auto focus works well for static images, but can vary considerably for moving subjects, especially in low light. Check reviews of the cameras for more information on the auto focus works well for the model you are considering.

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