when you talk 1:1 what do you mean.
considering the size of the screen compared to the sensor, you are already at at least 3 X.
But, knowing where this is going, when people talk about 100% they usually talk about pixel mapping. Look at the spec's for the screen, 925000 pixels I think, and then consider your image, 14MP or so depending on the actual camera body.
then just take the square root of the MP from the camera over the pixel count of the screen to get the mag ratio for 100%.it will be in the range of 3-4x
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