seleccionasteis
-you selected
The word seleccionasteis is the preterite form of seleccionar in the second person plural.
See the full seleccionar conjugation

seleccionar

Con estos números en mente, vuelve a realizar el enfoque inicial, y a continuación pulsa el botón de focus stacking, introduce el numero de fotografías a realizar (el numero de pulsaciones que realizasteis antes) y el paso de enfoque que seleccionasteis.
With these numbers in mind, reset the focus, and then press the button for focus stacking, enter the number of shots to be taken (the number of keystrokes that realizasteis before) and the focus step selected.
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