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achromatic amount Anastigmat angle aperture astigmatism autochrome blue blue-violet bromide camera centre circle combination concave concave lens condenser convex convex lens correct crown curvature curve Dallmeyer developer diameter diaphragm disc dispersion distance distortion equal equivalent point exposure film filter fixed flat flint focal length focussing formula front gelatine give green ground glass hyperfocal distance illumination lantern latter lenses light lines Lumiere magnification measured meniscus method mirror negative lens Newman & Guardia object oblique obtained optical ordinary panchromatic paper parallel Petzval photographic photographic lens picture pinhole placed plate portrait lens positive lens principal axis principal focus prism produced rapid rapid rectilinear rays reflected refractive index rotated sensitive separation shutter side silver silver bromide slide solution spectrum speed spherical aberration stereoscopic stop surface telephoto lens three-colour true focal tube Unofocal violet wave yellow Zeiss