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How 24 Megapixel camera is cheaper than 16 MP?

Nikon D3100 is 14 MP (Megapixel) & D3200 is effective 24 MP. However 16 MP D5100 is more costly than than 24 MP. How is that? What is EFFECTIVE ?

I had visited Croma, Infinity, Reliance Digital and other malls but no one could clarify what is “effective”. Is it only a show and marketing? Why is it not purely 24 MP as in all other cases ?

Can any expert in this field pls clarify?

Thank you in advance.

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  1. I will write you a detailed explanation once I get home from work. As of now, 

    Effective Pixels is (generally) used to denote the pixels which will give you a full resolution.

    All high-end cameras have a Full Frame sensor. Which means all the pixels on the sensor can attract the light and give you a sharp image. The starting range DSLR’s dont have a full frame sensor, they have a crop factor. Nikon and Canon both have these crop factors.

    If you want to quickly compare the D5100 and the D3200 check this out https://www.dpreview.com/reviews/nikond5100

    The website dpreview should also be able to quell any of your other doubts. If you have any other doubts, ask away. I may not have answered your question directly but this should help.

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