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<blockquote data-quote="Revet" data-source="post: 306753" data-attributes="member: 17612">I have this sometimes bad habit of having to know why things are like they are.&nbsp; Anyhow, when I put my SB-700 speedlight on manual mode I notice that as I change ISO and/or the f stop, it changes the little bar graph showing distance on the flash LCD.&nbsp; For example, as I increase the f stop or lower the ISO, the distance bar-graph on the LCD decreases.Since I am in manual mode, I assume the intensity of the flash will not change (ie. 1/1).&nbsp; Saying that, I assume that as I increase the f stop or reduce the ISO, less light is getting to the sensor (or the sensor is less sensitive with Iso).&nbsp; Also, that would be true of both ambient and flash.&nbsp; So now I assume the camera's sensor is saying the exposure can only be exposed correctly at a shorter distance when lowering ISO and/or increasing the f stop.&nbsp; Is this reasonable thinking??If this is reasonable,&nbsp; why then is this all occurring without any metering going on (lens cap over lens and no buttons on the camera pushed)?&nbsp; I guess I will take a stab at this and say that this is pre-programmed into the SB-700 (ie. at a given ISO, f-stop and flash intensity, the distance the flash is effective is a standard distance which can be calculated by tables.So,&nbsp; I think I answered my own question as I worked through it on the thread but I just want to check the logic here.</blockquote>

[QUOTE="Revet, post: 306753, member: 17612"] I have this sometimes bad habit of having to know why things are like they are. Anyhow, when I put my SB-700 speedlight on manual mode I notice that as I change ISO and/or the f stop, it changes the little bar graph showing distance on the flash LCD. For example, as I increase the f stop or lower the ISO, the distance bar-graph on the LCD decreases. Since I am in manual mode, I assume the intensity of the flash will not change (ie. 1/1). Saying that, I assume that as I increase the f stop or reduce the ISO, less light is getting to the sensor (or the sensor is less sensitive with Iso). Also, that would be true of both ambient and flash. So now I assume the camera's sensor is saying the exposure can only be exposed correctly at a shorter distance when lowering ISO and/or increasing the f stop. Is this reasonable thinking?? If this is reasonable, why then is this all occurring without any metering going on (lens cap over lens and no buttons on the camera pushed)? I guess I will take a stab at this and say that this is pre-programmed into the SB-700 (ie. at a given ISO, f-stop and flash intensity, the distance the flash is effective is a standard distance which can be calculated by tables. So, I think I answered my own question as I worked through it on the thread but I just want to check the logic here. [/QUOTE]

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