The eyepiece is in excellent to mint condition. (other than the modification)
Focal length: 9.2mm to 18.4mm
AFOV: 65 Degrees throughout the whole zoom range.
Eye relief: 17mm
Weight:275 g
This is Swarovski's best eyepiece, very sharp, comfortable, and a joy to use.
It effectively replaces 5 Televue DeLite eyepieces (9,11,13,15,18)
NOTE: I have VERY carefully filed off the nose piece lugs. This now allows the zoom eyepiece to be used in any 1.25'' diagonal, without any adapters.(which changes the focal plane) BUT it stops it being used in a Swarovski spotting scope, unless you replace the nose piece.(which is held in via 3 screws) In my view, it's worth the effort, as it now becomes the very best zoom eyepiece for Astronomy.