Hey Jumbo,

Obviously Mt Spokane is right.

If you want to know the way to do it for any sensor here is the formula.

Divide the diagonal of a FF sensor by the diagonal of the sensor you want a multiplication factor for.

So 'FF' sensor diagonal equals square root of 24mm sq plus 36mm sq. Or a 43mm diagonal. Now take your 1" sensor, 8.8mm x 13.2 mm at 15.9mm diagonal. 43/15.9 = 2.70 crop factor for focal length and aperture.

Any figure you want on a ff camera divide by 2.7 to get on your 1" sensor. A 200mm f2.8 on FF would be a 74mm f1.0 equivalent on the 1" sensor. To go the other way multiply your 1" sensor lens by 2.7 to get the FF equivalent, so an 8mm f2.8 on the small camera would be a 22mm f7.6 on FF.

This also works for sensors larger than the base sensor, so you can work out equivalence figures in the negative for say a medium format sensor in relation to a 'FF' sensor.

Hope this addendum helps.