Editing F-number (section)

=== Gain ===
[[File:Panasonic_Iris-Gain_relationship.png|thumb|300px|right|Iris/gain relationship on Panasonic camcorders as described in the HC-V785 operating manual]]
Most electronic cameras allow the user to adjust the amplification of the signal coming from the image sensor. This amplification is usually called '''[[Gain (electronics)|gain]]''' and is measured in decibels. A {{val|6|u=dB}} of gain is roughly equivalent to one T-stop in terms of light transmittance. Many camcorders have a unified control over the lens f-number and gain. In this case, starting from (arbitrarily defined) zero gain and a fully open iris, one can either increase the f-number by reducing the iris size while gain remains zero, or increase the gain while the iris remains fully open.