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04/11/2011 12:38:43 PM · #1 |
Hello Everyone,
After you have got the manual setting and the external flash setting set correctly for indoor photography, do you change all settings again if you change the focal length? Or do you just adjust the flash power? Please advise.
By the way, is there a way to lock the focal length while I'm using a zoom lens? Thanks!
Ang |
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04/11/2011 12:42:23 PM · #2 |
only change your flash power if you change aperture or your subject distance.
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04/11/2011 12:54:03 PM · #3 |
Originally posted by apercep:
only change your flash power if you change aperture or your subject distance. |
If you are zooming and increasing the distance between yourself and the subject, the quantity of light will fall off as the distance increases at a given power (the law of inverse squares). Therefore, you may need to increase the flash power if the distance to subject is increased. |
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04/11/2011 01:47:31 PM · #4 |
Originally posted by angkokweng:
Hello Everyone,
After you have got the manual setting and the external flash setting set correctly for indoor photography, do you change all settings again if you change the focal length? Or do you just adjust the flash power? Please advise.
By the way, is there a way to lock the focal length while I'm using a zoom lens? Thanks!
Ang |
If you are using, as you said, an external flash without changing the position of the flash or the subject and ONLY change the distance between the camera and the subject or the lens focal length, then you do not need to re-adjust the flash power or camera settings at all. |
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04/12/2011 11:22:52 AM · #5 |
Originally posted by senor_kasper:
Originally posted by angkokweng:
Hello Everyone,
After you have got the manual setting and the external flash setting set correctly for indoor photography, do you change all settings again if you change the focal length? Or do you just adjust the flash power? Please advise.
By the way, is there a way to lock the focal length while I'm using a zoom lens? Thanks!
Ang |
If you are using, as you said, an external flash without changing the position of the flash or the subject and ONLY change the distance between the camera and the subject or the lens focal length, then you do not need to re-adjust the flash power or camera settings at all. |
This means the external flash (I'm using SB-600) would detect the distance and fired up accordingly? I do not need to re-adjust the flash power or camera settings at all.
In what situation do I need to adjust the flash power? |
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04/12/2011 08:16:25 PM · #6 |
| The flash does not have a way to measure distance. You need to think of your flash like a flashlight. The closer it is, the brighter it is. So if you have it set up, not on the camera, it does not matter where you take the camera, the exposure will not change. Really my best suggestion is to read up on off camera flash on a site like Strobist.com, and experiment. |
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04/13/2011 01:44:57 AM · #7 |
Originally posted by angkokweng:
......This means the external flash (I'm using SB-600) would detect the distance and fired up accordingly? I do not need to re-adjust the flash power or camera settings at all.
In what situation do I need to adjust the flash power? |
I am still assuming you are using the flash out of the camera and in manual setting (not TTL), If this is so, then, once you have arrived to the correct exposure settings for camera and flash for a given flash to subject distance, then the settings need to remain unchanged as long as that distance remains unchanged. You may move the camera, change the lens or focal length, zoom in or out, etc. without having to re-adjust the settings. The reason is simple: as long as the distance from the flash to the subject remains constant, the amount of light reaching the subject is constant regardless of where the camera is or what the lens focal length is.
You should adjust the flash power (or the f-stop or both) if the distance between the flash and the subject changes. |
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04/13/2011 02:55:57 AM · #8 |
Originally posted by senor_kasper:
I am still assuming you are using the flash out of the camera and in manual setting (not TTL), If this is so, then, once you have arrived to the correct exposure settings for camera and flash for a given flash to subject distance, then the settings need to remain unchanged as long as that distance remains unchanged. You may move the camera, change the lens or focal length, zoom in or out, etc. without having to re-adjust the settings. The reason is simple: as long as the distance from the flash to the subject remains constant, the amount of light reaching the subject is constant regardless of where the camera is or what the lens focal length is.
You should adjust the flash power (or the f-stop or both) if the distance between the flash and the subject changes. |
My SB-600 speed light is attached to my camera. I'm not using TTL in my manual setting. Your this reply is very clear to me. Thank you.
I also thank everyone who helps me to understand the matter better. |
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04/13/2011 03:28:59 AM · #9 |
Originally posted by angkokweng:
Originally posted by senor_kasper:
I am still assuming you are using the flash out of the camera and in manual setting (not TTL), If this is so, then, once you have arrived to the correct exposure settings for camera and flash for a given flash to subject distance, then the settings need to remain unchanged as long as that distance remains unchanged. You may move the camera, change the lens or focal length, zoom in or out, etc. without having to re-adjust the settings. The reason is simple: as long as the distance from the flash to the subject remains constant, the amount of light reaching the subject is constant regardless of where the camera is or what the lens focal length is.
You should adjust the flash power (or the f-stop or both) if the distance between the flash and the subject changes. |
My SB-600 speed light is attached to my camera. I'm not using TTL in my manual setting. Your this reply is very clear to me. Thank you.
I also thank everyone who helps me to understand the matter better. |
If you're firing it on camera, you may find your lighting results vary because the SB600 (and many other flashes) have an auto-zoom function. Not sure how much this will effect things, but It will have some sort of effect. You can disable this feature if you would like. There are instructions in the manual for doing so. Generally, it's a handy feature to use, but in this case, it may cause you issues. |
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04/13/2011 10:23:31 AM · #10 |
Originally posted by angkokweng:
My SB-600 speed light is attached to my camera. I'm not using TTL in my manual setting. Your this reply is very clear to me. Thank you.
I also thank everyone who helps me to understand the matter better. |
If the flash is attached to the camera and you ("you" being the photographer holding the camera) and the subject remain stationary then there will be no need to change the settings regardless of the focal length (you may zoom in or out or even change lenses), however, if the distance between you and the subject will be changing the settings must be adjusted with each change of distance. Whether you continue to use the manual mode or switch to an automatic mode (such as TTL) under those circumnstances is a matter of choice and practicality. Most times (such as when shooting events)you will not have enough time between shots to manually adjust your settings, therefore, an automatic mode is much more suitable in such cases and TTL is the ultimate automatic mode. |
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