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Milner extinction calculator, made by G. M. Milner, San Francisco. Extinction type meter, disc shaped. Reflected light seen through filter is compared with density of rotating step wedge. (M4463)

Milner extinction calculator

Heyde's Aktino-photometer made by W.F. Stanley & Co. Cylindrical extinction meter. Rotating continuous wedge moves under blue-glass eyepiece. High-low filter. (See 536 - larger)

Heyde's Aktino-photometer

Degen Photo-metre normal exposure calculator, made by Edward Degen, France. Extinction meter: scene viewed through two sliding continuous blue wedges, calibrated for aperture and shutter speed. Presetting one, the other is adjusted to find exposure.

Degen Photo-metre normal exposure calculator

1900-1910
Practos exposure extinction meter.

Practos Exposure Extinction Meter.

Eios aktinometer made by Dr. Schlicter, Germany. Extinction type photometer, telescope type.; comparative type with sector wheel adjustment; fields set in diffuser screen. Calibrated H and D 12-2000. (M388)

Eios aktinometer extinction meter

Zeiss Ikon diaphot meter. Watch pattern extinction meter in case, with German instructions.

Zeiss Ikon diaphot meter. Watch pattern extinction meter in case

circa 1925
Disc-cylindrical extinction meter (see 535 - smaller) rotating continuous wedge behind blue glass in eyepieces. 1 scale.

Heyde's Aktino-photometer

1905-1935
Heyde's Aktinometer. Extinction meter for use on camera ground glass screen. Manufactured by A. E. Staley and Co, London EC.

Heyde's Aktinometer. Extinction meter for use on camera ground glass screen

circa 1914
Practos extinction calculator for use with Cine cameras marked Scheiner and H. & D. c.1930

Practos extinction calculator

circa 1930
Ica Diaphot extinction calculator, made by Zeiss Ikon A.G. Watchform extinction calculator, rotating continuous wedge, blue tinted, moves behind eyepiece.

Ica Diaphot extinction calculator

Practos exposure extinction meter and case.

Practos Exposure Extinction Meter and Case.

Drem Leica extinction calculator. Drem Zentrale, c.1930.

Drem Leica extinction calculator. Drem Zentrale

circa 1930
Watch form visual exposure meter. Blue filter in eyepiece. Circular continuous wedge. Scales US 1.5-16 f/4.5-16. Exposure times from 6 mins - 1/1000sec. ICA

Ica Diaphot Extinction Meter

Visual extinction meter, telescope type, with case and instructions. Calibrated f/2.8-22 FPS 1-128. Film speed 17-30 degrees Sch. Kodacolor scale.

Drem Cine Meter