Mk II- 580EX flash exposure

mquilli · Mar 17, 2005

I've been shooting my New Mk II and 580EX flash for a couple of weeks now (after years with Nikon). I have a pretty good feel for the quirks of the combo ie: -2/3 to -1/3 ev, for most shooting assignments. But on the whole I'm quite pleased.

However, last night while getting ready to shoot a photo reception line (same background just different subjects). I notice when one of the guests were wearing a light (white-tan)colored dress or suite. Exposure went a full stop under the present setting. So instead of letting the camera\flash do the work. I ended up doing the dialing to correct the exposure myself. First time I ever ran into this. Which got me thinking when could this problem arise again, aka: a bride in a white dress. I understand the mechanic of whats going on. Just wonder if any of you long time Canon users have a solution for me.

Thanks in advance.

BlueReptile · Mar 17, 2005

instead of evaluative in tricky situations like this. CF14 I think...

Delroy Thomas · Mar 17, 2005

This article addressed this issue to some degree I think. I read it this morning and I plan to try their approach when I get a chance.

They also mention something in the article about focusing with the * button. There was a PDF floating around on how to set up your camera to move focusing from the shutter button to * button on back. You don't need to do this to take advantage of what they aqre saying, but it will make it more convenient. They have a good explanation on this on how it might help.

Read the article and what I say will make more sense.

http://visual-vacations.com/Photography/1ds_and_ettl_flash.htm

thx1138 · Mar 17, 2005

Delroy Thomas said:
This article addressed this issue to some degree I think. I read it
this morning and I plan to try their approach when I get a chance.

They also mention something in the article about focusing with the

button. There was a PDF floating around on how to set up your

camera to move focusing from the shutter button to * button on
back. You don't need to do this to take advantage of what they
aqre saying, but it will make it more convenient. They have a good
explanation on this on how it might help.

Read the article and what I say will make more sense.

http://visual-vacations.com/Photography/1ds_and_ettl_flash.htm

He has a E-TTL II system and depending on what lens, if it is sending distance data then he should not be getting that problem. This was a specific improvement in E-TTL II over the original E-TTL. The camera will use distance data to calculate a GN and use that for exposure rather than being fooled by the highly reflective material.

http://www.cps.canon-europe.com/articles/article.jsp?article.articleId=100262

mquilli · Mar 18, 2005

Thanks for you help gang. I'm afraid I'm at a dead end with this problem. A real bummer. Spoke to Canon Tech for some assistance. They tried; but gave me no working solution. Exposure problem is still there. The real kicker is that when I put my old Nikon SB-28 flash on Auto setting and fire away. Exposure is spot on. Unfortunatly 580EX Canon flash does'nt have that capability. With several weddings comming up this year. It looks like at this point I'll be using my MKII w\ a Nikon fllash for indoor shooting at least.

mquilli said:
I've been shooting my New Mk II and 580EX flash for a couple of
weeks now (after years with Nikon). I have a pretty good feel for
the quirks of the combo ie: -2/3 to -1/3 ev, for most shooting
assignments. But on the whole I'm quite pleased.

However, last night while getting ready to shoot a photo reception
line (same background just different subjects). I notice when one
of the guests were wearing a light (white-tan)colored dress or
suite. Exposure went a full stop under the present setting. So
instead of letting the camera\flash do the work. I ended up doing
the dialing to correct the exposure myself. First time I ever ran
into this. Which got me thinking when could this problem arise
again, aka: a bride in a white dress. I understand the mechanic of
whats going on. Just wonder if any of you long time Canon users
have a solution for me.

Thanks in advance.

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Mk II- 580EX flash exposure

mquilli

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thx1138

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