In finance, the expiration date of an option contract is the last date on which the holder of the option may exercise it according to its terms.
ALV: Amicale LaÃ¯que de Voiron (French sports organization; Voiron, France) ALV: Asta La Vista: ALV: Application List Viewer: ALV: Automatic Licence Verification (UK) ALV: Air Launched Vehicle: ALV: Advanced Launch Vehicle: ALV: Area of Landscape Value: ALV: Available Lysine Value: ALV: Algemene Leden Vergadering (Dutch: General Membership Meeting)
Yep you've got the abbreviations right. Av = aperture value = aperture priority auto exposure Tv = time value = shutter priority auto exposure Both of these modes allows you to set a firm value for either aperture or shutter speed, and let the camera work out the exposure needed.