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Quantum Calcu-Flash II Digital Flash and Ambient Exposure Meter (CF2) Nearly identical in size and weight to the Calcu-Flash S. Performs all Calcu-Flash S functions plus the CF2 is a combination meter that measures electronic flash (with a longer range than the CFS), and flash plus ambient or, ambient light alone. Ambient incident and reflected light measurements also. Reflected flash, spot, fiber opticand contrast readings possible with optional accessory attachments. Blue enhanced silicon photodiode light metering cell. Adjustable flash sync speed settings from 1/15 to 1/500. Pushing a single button is all that's required to activate the meter. Memory recall of last reading. Triggers with cord, giving ability to test fire flash subject position, or without cord. Supplied NEW with incident flash turret (Hi and Lo), ST reflected light turret, flash cord, neckstrap, batteries and case. Digital display: two digit LED numerals representing light value in 1/3 EV sequence of 01 to 45. Dial shows proper f/stop setting opposite EV number scale. Display stays on for only a few seconds to conserve battery life; pressing memory button will bring display back. Ability to relate digital readings directly to footcandle seconds, foot-lambert seconds, or BCPS. Flash measuring range: ASA 100, incident flash: f/1.4 - f/181. Ambient light measuring range: EV3 to EV24 at ISO 100. ASA range: 0.8 to 50,000 Fstop scale: 1 to 181. Batteries: MS76 Size: 4x2.75x1.1 in. Weight: 4.6 oz. (***MORE: page down***) Quantum Meters Optional Accessories: SX-1 10 Degree Spot Attachment, DX-1 Flat Diffuser, FOX-1 1" Fiber Optic Probe, SDX Swivel Studio Dome, DX-2 Diffuser/Enlarging Attachment, FOX-2 12" Flexible Fiber Optic Probe, MX-1 Microscope Attachment, HC-1 Hard Case CL/CF, FTS Flash Trigger Switch, CFC Calcu-Flash Replacement Sync Cord.