Entering lens length for legacy lens'

[aviolette]

If focal lengths are extended by 1.5 when switching to a digital body (i.e. 50mm = 75 mm), and you are using an older legacy lens, when the anti-shake feature asks for the focal length of the lens should you be entering it's non-digital length or digital equivilent (i.e. 50 or 75?)

[SpecialK]

The focal length given on the lens.

[aviolette]

I was thinking the same, but it's good to have a second opinion.

Thank you!