The Nikon D40 and D50 are both digital SLR cameras created by Nikon for entry-level photographers who are looking for a digital camera that gives them the flexibility to exchange lenses and manipulate manual controls. While the Nikon D40 and D50 are just one model number apart, they have several differences that make them stand out as their own unique camera model, in many cases putting the cheaper D40 above its more expensive counterpart.
Megapixel
Both the Nikon D40 and D50 take pictures at a 6.1-megapixel resolution. A 6-megapixel resolution photo can be printed up to 8 x 10 size while maintaining its resolution and quality.
ISO
The Nikon D40 has an ISO sensitivity of 200-1,600 with the ability to go up to 3,200 with a boosting option. The Nikon D50 on the other hand only has an ISO range of 200-1,600 with no option to go up to 3,200. The ISO setting in your camera determines how sensitive your camera's sensor is to light. The Nikon D40 is technically capable of handling lower-light situations slightly better than the D50 due to the option of going up to a 3,200 ISO setting.
LCD
The Nikon D40 has a 2.5-inch 230,000-pixel LCD, whereas the Nikon D50 has a slightly smaller 2-inch 130,000-pixel LCD.
Storage
The Nikon D40 is capable of saving pictures to both secure digital (SD) and high-capacity secure digital card (SDHC). The Nikon D50 is only capable of saving picture to traditional SD cards. What that means is that you can use larger-capacity cards that are capable of holding more picture in the D40, but not in the D50.
Price
As of 2009, the Nikon D40 starts at $599 for a kit with an included basic lens. The Nikon D50 starts at $899 for the kit with included lens.
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