3 x 7 format 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 9 x 18 format Achromat Achromatic lens Achromatic Mirror Stereoscope Achromatic Stereoscope Achromatic Table Stereoscope Additive colour Album Magique Album stereoscope Albumen print Alternascope Altostereoskop Ambrotype American Corte-Scope Company American Novelty Company American stereoscope American Stereoscopic Company Amphitype Anaglyph Anthony, E. & H.T. Apédioscope Apéscope Appleton & Company, D. Art Nouveau Astra Auto-Stéréoscope