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DX lens on DX Camera .... Apparent magnification or Not?


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2 replies to this topic

#1
Tahlee

Tahlee

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Hello fellow Nikondians

 

Here is a simple question that requires a simple answer.

 

Scenario A

I am taking a picture of a TV screen wth my

  • FX camera
  • FX 70-300mm lens,
  • standing 3 metres back
  • and focus in at 100mm on the camera scale 

When the picture is printed in 16inch X 9inch format then the perimeter of the TV unit reaches along all edges of the photo. Got the picture?

 

Scenario B

I am taking a picture of a TV screen wth my 

  • DX camera
  • FX 70-300mm lens, 
  • standing 3 metres back
  • and focus in at 100mm on the camera scale. 

The 16inch x 9 inch print will show only part of the TV screen  ...like the screen is 1.5 times as big as it really is.

 

Scenario C

 

  • DX camera
  • DX 70-300mm lens, 
  • standing 3 metres back
  • and focus in at 100mm on the camera scale 

Question

Will scenario C give me a 16 X 9 printed photo that looks like A, or will it look like B?   or will it be something completely different?

 

I'm getting a comfy seat and some popcorn for this one.

 

Regards

 

Rob

 

 



#2
Adam

Adam

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C will look just like B.  Focal length is focal length, regardless of the format covered by the lens.



#3
Merco_61

Merco_61

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The focal length is a physical property of the lens. It doesn't change with the crop at the sensor plane.

100 mm on DX, whatever lens is used, will give the same field of view as 150 mm on FX