Can any of you explain to me how 1.3x crop of D7100 is giving 2x zoom?

Started Feb 22, 2013 | Discussions thread
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Re: Can any of you explain to me how 1.3x crop of D7100 is giving 2x zoom?
In reply to Sunshine_boy, Feb 22, 2013

Sunshine_boy wrote:

Wing2 wrote:

Spec says it still have 15.4M pixels - more like 1.25x crop to me.

My understanding is to give 2x zoom - the resolution needs to go down to 6M pixels.

Or did Nikon meant the shutter speed got boosted 2x?

Let's say you have the 50mm lens on.

You get the 1.5 crop factor due to DX (over FF) so you now have 50x1.5=75mm equivalent.

Further to that, optionally, you can have 1.3 crop factor (over the DX) so you end up with 75x1.3=97.5mm

or 97.5 / 50 = 1.95 (or 2 near as dammit) from your original 50mm

In other words, the combined crop factor over FF is 1.5x1.3=1.95

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Might have been a little clearer if Nikon had just called it a 2x crop mode, but then I guess someone would have gotten confused by that.

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