# D7100 1.3x crop - Is it my math or...

Started Jun 17, 2013 | Questions thread
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 Re: D7100 1.3x crop - Is it my math or... In reply to BirgerH, Jun 17, 2013

BirgerH wrote:

Suhas Sudhakar Kulkarni wrote:

Nikon claims on their website that 1.3x crop gives 15.4 MP image.

http://imaging.nikon.com/lineup/dslr/d7100/features01.htm#a10

However, If I calculate:

1.3x1.3=1.69

24/1.69=14.20MP approx.

Which one is correct?

Also 1.5x1.3 would give total crop of 1.95x and not 2x as specified by Nikon.

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Suhas
website: photo.net/photos/suhaskulkarni

Because:

1.5 crop is not exactly 1.5 crop. With the D7100 it is 1.53518 if you use the relation of 24 x 36mm.

1.3 crop is not exactly 1.3 crop. In relation to 24 x 36 mm it is 1.91744 (aprox. 2)

The "1.3" crop will then be the square root of the Square of 1.9744 divided by the Square of 1.53518, which wil be 1.2490, aprox. 1.3

And then you got aprox. 15.4 MP (24/1.249/1.249).

Thats the math - but why bother - go use it.

BirgerH.

Sorry, missed a 1 in "Square 1.91744"

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Nikon D90 Nikon D7000 Nikon AF Nikkor 85mm f/1.8D Tamron SP AF 11-18mm F/4.5-5.6 Di II LD Aspherical (IF) Tamron AF 18-200mm F/3.5-6.3 XR Di II LD Aspherical (IF) Macro +14 more
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