DX "reach" versus image magnification

Started Feb 2, 2013 | Discussions thread
Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 12,418
Re: DX "reach" versus image magnification

afoton wrote:

It is really the same

Ignoring the thread moving away from the question, this is the correct answer.

From the same focus distance with the same focal length lens you get more image magnifications on DX than FX.

Provided you maintain focal length and focus distance the crop factor and change in magnifications are equal.

In the era of the D3 and D300 both had 12MP and negligible quality difference to about 1600 ISO. Buying a DX body often made more financial sense than going from 70-200mm f2.8 on a D3 to a 300mm f2.8 prime.

In a similar way the 24MP D5200 has what you refer to as a reach advantage over the 24 MP D600 at lower ISO's if you need to factor in the cost of something like a 300 f2.8 prime.

The D5200 also has a modest reach advantage over a DX cropped D800 image.

Before anybody jumps in saying the D800 has better autofocus the D800 UK street price is three times that of the launch price of the D5200, which in turn is half the D600 street price.

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Leonard Shepherd
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