Relation Between Iris And F-Stop

In regards to the class today, I just want to make sure I understand correctly.

Am I correct in saying that the F-Stop and the Iris are interchangable terms? (they are the same thing?) When one refers to an F-Stop, its the ratio of how "open" or "closed" the iris is right?

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********** * ** ****** *************** **** ** ****,but *** *** ***** ********** *. So in your mind at least just think f-stop number, if it is referring to the ratio of length to width.

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**low ***** at least, wouldn't you say that preferring slow shutter over high gain is not a common technique in video surveillance. Indeed, almost every camera manufacturer defaults to allowing gain to automatically max out in low light but many manufacturers restrict how slow the shutter can get. ;)

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***, **** * ****, "******'* *** ***"',

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* ***** ** ******* *** *** ******* **** **,****. *** *** ***** *** ** ******* :(

* ***** * ********** ********* *** **** *** *-**** ****** does *** *********** **** ***** ** ** ********** **** *******?

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*** *** ** *** *****.

*** ****** *** **** ******* ** ************* ********** *** ********* light ******, (*** *** *** ********* ** *** *******).

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  3. ********/******** ********* ****. (****-****)
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