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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 06 Jan 2010 (Wednesday) 10:48
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Internal Flash questions on my 50D

 
hammmerhead
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Jan 06, 2010 10:48 |  #1

I have been taking shots of a fish tank while the light are off with the internal flash. I am trying to get my shutter speed up and keep the aperture at 1.4. In AV mode I cant keep the shutter speed fast at F1.4. When I put it on P mode it gives me a faster shutter speed at a set F2.8, but of course I cant change the F stop in this mode. This is with a constant ISO not auto ISO. I have tried in manual mode and its the same thing. I hardly ever use my flash so any help is greatly appreciated! Thanks Guys.


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runninmann
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Jan 06, 2010 10:53 |  #2

hammmerhead wrote in post #9336322 (external link)
I have been taking shots of a fish tank while the light are off with the internal flash. I am trying to get my shutter speed up and keep the aperture at 1.4. In AV mode I cant keep the shutter speed fast at F1.4. When I put it on P mode it gives me a faster shutter speed at a set F2.8, but of course I cant change the F stop in this mode. This is with a constant ISO not auto ISO. I have tried in manual mode and its the same thing. I hardly ever use my flash so any help is greatly appreciated! Thanks Guys.

Please explain what you mean. In manual, you can set the aperture and shutter speed you want. Do you mean that the results are not acceptable at a fast shutter and large aperture?


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hammmerhead
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Jan 06, 2010 10:59 |  #3

Basically when I go manual its showing on the exposure level line that the photo is under exposed when I use those settings. It seems like its telling me its going to be way under exposed, maybe this is normal.


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runninmann
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Jan 06, 2010 11:07 |  #4

hammmerhead wrote in post #9336322 (external link)
I have been taking shots of a fish tank while the light are off with the internal flash. I am trying to get my shutter speed up and keep the aperture at 1.4. In AV mode I cant keep the shutter speed fast at F1.4. When I put it on P mode it gives me a faster shutter speed at a set F2.8, but of course I cant change the F stop in this mode. This is with a constant ISO not auto ISO. I have tried in manual mode and its the same thing. I hardly ever use my flash so any help is greatly appreciated! Thanks Guys.

hammmerhead wrote in post #9336384 (external link)
Basically when I go manual its showing on the exposure level line that the photo is under exposed when I use those settings. It seems like its telling me its going to be way under exposed, maybe this is normal.

If the lights are off, then without the flash, the shot probably would be underexposed. The camera's meter isn't taking into acoount the fact that you plan to use flash.


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hammmerhead
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Jan 06, 2010 11:19 |  #5

runninmann wrote in post #9336425 (external link)
If the lights are off, then without the flash, the shot probably would be underexposed. The camera's meter isn't taking into acoount the fact that you plan to use flash.

Well, I guess I was assuming the camera already took into account the flash is raised. When it is raised it will flash twice I think to help for the focussing. I figured it metered off the two flashes it emits when the strobe is raised. I still dont know why I can get a faster shutter speed in P mode at f2.8 than I can in AV mode at F1.4 only when the flash is raised.


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gonzogolf
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Jan 06, 2010 11:23 |  #6

Av and P modes calculate exposure differently, especially using flash. Just do this, set your camera to M, pop up the flash use about 1/100 shutter speed and a mid range fstop 5.6 maybe and see what you get. Keep in mind that most of the flash will reflect off of the tank and will probably screw your exposure anyway. Its best to put the lens right against the glass if possible.




  
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runninmann
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Jan 06, 2010 11:30 |  #7

Check out page 107 of your manual. It does a decent job of explaining the differences in how the flash works with the various modes.


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hammmerhead
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Jan 06, 2010 12:01 |  #8

Thanks for the advice guys.


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Internal Flash questions on my 50D
FORUMS General Gear Talk Flash and Studio Lighting 
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