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metering with on camera flash .
I was wonder do any know how I can setting up the flash with my camera is in manual mode..

When I look into the camera view finder in manual mode it tell me the picture is underexpose with the setting I want. when I take the shoot sometimes the picture come out great and sometimes it come out okay. I was wondering if anyone could guide me on how to calculate the flash in metering, so I can get consistent exposure. I would like to understand this with ttl and without ttl...

Comments (7)

We need more informtion..

What kind of camera, and what kind of flash, and where is the flash how far away from the camera and how is it connected to the camera so that the flash is illuminated when you press the shutter release..

The meter settings you see in the camera viewfinder relate to the measurement of the available light in the scene, not the subject illuminated by the flash..

So if the meter says the scene requires an exposure of 1/60 at f2.8 and you want 1/60 at f8 and youset the camera at 1/60 at f8 and the picture turns out god, it is because the flash adds enough light to permit an f8 exposure. If you turned off the flash, the picture would be underexposed. If you left the flash turned off and changes the aperture to f2.8, it would turn out good, too..

BAK..

Comment #1

I setup is a nikon d80 with sb-600 flash with a 28 200 zoom lens at 3.5 - 5.6, metering system is spot and center weight. when I get time I try to play around with my camera more with the flash. I know my lens don't have the fast lens out there for indoor shooting. So I like to keep my iso at 400 too 800 but without the flash in manual mode the camera still me the picture is going to way underexpose. In order to get the correct exposure I would have to set the camera shutter to 1/30 sec When I use my external sb-600 and.

Take the shot the picture is extremely overexpose from the flash with the same setting. the metering system never change with turning on the flash with the camera in manual mode. i'm trying to understand how to meter know i'm going use the flash and how to adjust me shutter and aperture according so I can get consistent shot rather playing around with all the setting for every shot with or without the flash...

Comment #2

When you use flash your exposure is a combination of flash and ambient light. Your shutter speed has no effect on the flash component of your exposure. Although I use a Canon I think my method will be of use to you.I set my 20D in manual /125 sec @ 5.6...ISO 400I set my External flash to ETTL which is really automatic.I take a test shot and look at the histogram..

I can adjust the ambient part of the exposure using Exposure Compensation and I can also adjust the flash part of the exposure by using Flash Exposure Compensation..

Using these two exposure adjustments I have full control of the balance between the ambient part of the exposure and the flash part of the exposure to get the effect I want.Hope this helpsTom.

Http://www.pbase.com/tomstorey..

Comment #3

Hey Tom.

I was wonder could you explain a little regarding the flash compensation and camera exposure compensation. I tried what you said in you last post and I think i'm idea getting the idea just want to understand when use I use more or less flash or exposure compensation and should also disregard the camera meter...

Comment #4

OK.....You know you have to set a shutter speed which cannot be higher than the sync speed of your flash, I can set any shutter speed up to 1/250 sec. The default shutter speed is 1/60 but I usually prefer around 1/125..

Most of the time I only adjust the flash output by using Flash Exposure Compensation..

I can do this using the camera flash exposure compensation control or the Canon flash exposure control on the back of the flash gun.Either way it will increase or lower the flash part of the exposure.I hope this helps you.Tom.

Http://www.pbase.com/tomstorey..

Comment #5

So would this be called flash photography since you pretty much using flash for lighting rather then ambient light?.

I know now that shutter has nothing to do with flash as tom explained, so where does the aperture and iso role with tom technique?.

Also does this technique apply with ttl fill flash?.

Tom Storey wrote:.

OK.....You know you have to set a shutter speed which cannot behigher than the sync speed of your flash, I can set any shutter speedup to 1/250 sec. The default shutter speed is 1/60 but I usuallyprefer around 1/125.Most of the time I only adjust the flash output by using FlashExposure Compensation.I can do this using the camera flash exposure compensation control orthe Canon flash exposure control on the back of the flash gun.Either way it will increase or lower the flash part of the exposure...

Comment #6

Khris3 wrote:.

So would this be called flash photography since you pretty much usingflash for lighting rather then ambient light?.

Whenever you use flash, it's flash photography, even if you use so little that it's invisble. Ambient is using just what's available..

I know now that shutter has nothing to do with flash as tomexplained, so where does the aperture and iso role with tom technique?.

I actually disagree with Tom, but I don't know if it's because I use Canon. Aperture, ISO, and shutter, all let in more light, reducing the amount of power your flash has to use. Besides ISO, aperture and shutter are creative outlets too. With Canon, shutter is still used for ambient exposures, flash is meant for the subject, although you should read up on Nikon's "Creative Lighting" approach. Canon and Nikon's flash systems work very differently with exposure compensation and Flash compensation. I think that Canon separates the two more (+1EC -1FEC would be more ambient, less flash), where as Nikon almost links them together (ie +1 -1 would equal out)...

Comment #7

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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