Aperture posters & prints

Frauhofer diffraction patterns generated through different apertures L Schwerd

Polyorama Panoptique Anonymous

Camera Lens Anonymous

Orbital Radar View of Sakurajima Volcano Anonymous

Keck Telescope Anonymous

St Ethelbert Gate, Norwich, Norfolk Anonymous

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Camera Anonymous

Telescope speculum for Lord Rosse's 72-inch telescope at Birr Castle, Ireland Anonymous

Keck Telescope at Twilight Anonymous

Orbital Radar Image of Russian Space Facility Anonymous

Lord Rosse's 72 in/1.8m reflecting telescope, 1849 Unknown

Bishop’s Observatory, Twickenham Day & Son

[Major] Tennant's reflector used for photography Anonymous

Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland Anonymous

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Neritina communis Anonymous

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Telescope speculum for Lord Rosse's 72-inch telescope at Birr Castle, Ireland Anonymous

Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland Anonymous

Methods of 'gaging the heavens' William Herschel

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

The Civil War in America the U.S. Gun-Boat Weehawken One of the Nine Ironclads Engaged in the Bombardment of Charleston... Anonymous

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Lord Rosse's telescope at Birr Castle, Ireland Countess Mary of Rosse

Human bladder and bladder stones Elizabeth Blackwell

Elaphe taeniura friesi (Taiwan beauty snake) Anonymous