Spacers & Extensions

Astro-Physics 80.8mm Back-focus Spacing Distance

All 3.5” and 4” field flatteners (FF) and telecompressor correctors (TCC) (except 4”FF shipped with 155EDF, 180EDF and 206EDF) can be configured to have 80.8mm back-focus spacing. This is the distance from the camera sensor or chip to the flange of the optional back-focus spacer recommended for the field flattener or TCC. This allows you to purchase one adapter for use with all field flatteners and TCCs listed above.  You don't need to purchase multiple adapters. It also minimizes the number of components in your imaging train.