F-stop

An f-stop is a designation to indicate a camera’s aperture opening, and a flash unit’s power level. Our flash units are measured in power over a range of available f-stops, indicating the high or low power level setting of the unit. Each f-stop (shown on the back panel of our flash units) lets in twice as much light as the f-stop before it, and half as much light as the f-stop after it. Over a 5 f-stop range, the power is adjustable from Full down to 1/32 of the total power. For f-stops in relation to your camera’s lens opening, see aperture.

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1972 Honeywell Pentax ad, Spotmatic 35mm camera picture
1972 Honeywell Pentax ad, Spotmatic 35mm camera
1972 Pentax advertisement page, Pentax Spotmatic II camera, Honeywell picture
1972 Pentax advertisement page, Pentax Spotmatic II camera, Honeywell
Spotmatic Genuine Asahi Pentax Clip-On Flash/Accessory Cold Shoe Mount picture
Spotmatic Genuine Asahi Pentax Clip-On Flash/Accessory Cold Shoe Mount
Spotmatic Genuine Asahi Pentax Slip-On Flash/Accessory Cold Shoe Mount picture
Spotmatic Genuine Asahi Pentax Slip-On Flash/Accessory Cold Shoe Mount
Spotmatic Genuine Asahi Pentax Clip-On Flash/Accessory Cold Shoe Mount picture
Spotmatic Genuine Asahi Pentax Clip-On Flash/Accessory Cold Shoe Mount