Quoting Gregarious119 (Reply 8):
*Do you know what Altitude he was at when you snapped him? Is Barton in the UK?* |

Yes, Barton's near Manchester in the UK. Altitude, I'd hazard a guess at FL360.

A calculation.... The aircraft is 250pix long out of 3072 pix in the full image. The 400mm lens has a horizontal angle of 6deg so the resolved angle is 0.488 deg.

With the 1.6x scaling factor in the digital camera, this resolved angle is 0.488/1.6 deg = 0.35deg

Length of an A330-200 is 58.8m

For a right angle triangle, the short length will be 29.4m (half the aircraft length) and the angle 0.1525 deg (half the resolved angle). This gives a distance of 11045m, i.e. 36239ft. The aircraft wasn't directly above me, so this distance will be marginally less, but FL360 is probably about right.