3-D 45 x 107 format 6 x 13 format 7 x 13 format 8 & 9 8.5 x 17 format 9 x 12 format 9 x 14 format Achromatic lens Achromatic Mirror Stereoscope Achromatic Table Stereoscope Additive colour Albumen print Alternascope Ambrotype American stereoscope American Stereoscopic Company Amphitype Anthony, E. & H.T. Apédioscope Apéscope Art Nouveau Astra Autochrome Beckers-type stereoscope Beckers, Alexander Benescope Betrachtungs Apparat