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Author Topic: White Balance  (Read 2117 times)

nollamo

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White Balance
« on: February 02, 2007, 11:58:11 am »

New to digital and just a keen amateur. I have just purchased a Canon 5D and I need some help please.

I set up a macro environment using a cube and studio lights either side. Small amount of ambient light also in the room about 1/2 stop.

I have taken an incident light reading and set camera up manually with correct readings.

I have taken test shots using AWB and Flash WB settings with light meter reading (as taken) of 125/f5.6 all the images are overexposed, I need to stop down to F11/14 to obtain a relatively correctly exposed image.

I know I can adjust in photoshop and can take a custom reading but cannot understand why the camera is overexposing so much using the in camera custom settings. All the kit is brand new including the meter - am I doing something wrong? Any advice?
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howiesmith

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White Balance
« Reply #1 on: February 02, 2007, 12:19:08 pm »

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New to digital and just a keen amateur. I have just purchased a Canon 5D and I need some help please.

I set up a macro environment using a cube and studio lights either side. Small amount of ambient light also in the room about 1/2 stop.

I have taken an incident light reading and set camera up manually with correct readings.

I have taken test shots using AWB and Flash WB settings with light meter reading (as taken) of 125/f5.6 all the images are overexposed, I need to stop down to F11/14 to obtain a relatively correctly exposed image.

I know I can adjust in photoshop and can take a custom reading but cannot understand why the camera is overexposing so much using the in camera custom settings. All the kit is brand new including the meter - am I doing something wrong? Any advice?
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You said you are taking an incident meter reading.  Can I assume you are using a flash meter?

Turn the shutter speed up to the sync speed (1/200) of the camera.  That will help a small amount.  Flash exposure is set by f/stop and not shutter speed.  A high shutter speed will reduce ambient light exposure.  Then follow the flash meter.
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nollamo

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White Balance
« Reply #2 on: February 02, 2007, 04:31:16 pm »

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You said you are taking an incident meter reading.  Can I assume you are using a flash meter?

Turn the shutter speed up to the sync speed (1/200) of the camera.  That will help a small amount.  Flash exposure is set by f/stop and not shutter speed.  A high shutter speed will reduce ambient light exposure.  Then follow the flash meter.
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Thanks, yes to using a flash meter sync to two 500w Bowens, I will try the sync speed. I set the meter, shutter speed to 125 and the reading based on flash used was f5.6. This is correct use isn't it? Sorry for my lack of knowledge.
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howiesmith

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White Balance
« Reply #3 on: February 02, 2007, 04:45:23 pm »

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Thanks, yes to using a flash meter sync to two 500w Bowens, I will try the sync speed. I set the meter, shutter speed to 125 and the reading based on flash used was f5.6. This is correct use isn't it? Sorry for my lack of knowledge.
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f/5.6 sounds pretty open for 2-500 watt lights.  I can't tell what's wrong, but sounds like something.  Is ISO set OK?

Cube with two lights.  Is it a cube made of mirrors on black glass?  A classic studio assignment.
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