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YN-468 II overexposes when using iTTL
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<blockquote data-quote="phillymike" data-source="post: 176096" data-attributes="member: 15642"><p>I used the flash for some family photos yesterday. It seems that in real world shooting, with the flash aimed slightly up (to diffuse the light), the results were mixed, but looked suitable. (I still need to created some test shots to upload.)</p><p></p><p>The article on how metering works is very informative. I considered much of it intuitive, except for the fact that the camera's metering (is it spot? area?) may not be what I think it is. I have to figure out how to adjust it, maybe I changed a default setting at some point. Maybe change the flash compensation.</p><p></p><p>What I am wondering is if one of the issues that I had is that my testing was done by pointing the flash directly at a scene. While, when I angle the flash the results are more consistent. Could it be that with this flash, it is the pre-flash used to measure the iTTL that is 'bad'. If that pre-flash was not consistent or repeatable, then the measurement might be off. Maybe 'aiming' the system at a specular object is not the right test. Maybe it is just that the flash compensation needs to be adjusted.</p><p></p><p>None of this really explains why the flash is not behaving consistently, and that is what bothers me. I cannot figure out why the exposure is not always the same. Sometimes it is fine, other times it is overexposed. Just the two deltas, nothing has been significantly underexposed.</p><p></p><p>Maybe the digital iTTL communication is the issue. Could it be that Yongnou did not properly reverse engineer the protocol? (Somewhere I found a reference for the protocol on the internet, it seemed simple enough.)</p><p></p><p>My intuition is that most of what could go wrong would lead to 'underexposed' rather 'overexposed' pictures, but I can see how things could go awry. I have not had much experience with flashes, so my naiveté is that the iTTL should work. Of course in my case it is not working so... </p><p></p><p>The solution may be to just use this flash in manual mode - just like the 'professionals'.</p></blockquote><p></p>
[QUOTE="phillymike, post: 176096, member: 15642"] I used the flash for some family photos yesterday. It seems that in real world shooting, with the flash aimed slightly up (to diffuse the light), the results were mixed, but looked suitable. (I still need to created some test shots to upload.) The article on how metering works is very informative. I considered much of it intuitive, except for the fact that the camera's metering (is it spot? area?) may not be what I think it is. I have to figure out how to adjust it, maybe I changed a default setting at some point. Maybe change the flash compensation. What I am wondering is if one of the issues that I had is that my testing was done by pointing the flash directly at a scene. While, when I angle the flash the results are more consistent. Could it be that with this flash, it is the pre-flash used to measure the iTTL that is 'bad'. If that pre-flash was not consistent or repeatable, then the measurement might be off. Maybe 'aiming' the system at a specular object is not the right test. Maybe it is just that the flash compensation needs to be adjusted. None of this really explains why the flash is not behaving consistently, and that is what bothers me. I cannot figure out why the exposure is not always the same. Sometimes it is fine, other times it is overexposed. Just the two deltas, nothing has been significantly underexposed. Maybe the digital iTTL communication is the issue. Could it be that Yongnou did not properly reverse engineer the protocol? (Somewhere I found a reference for the protocol on the internet, it seemed simple enough.) My intuition is that most of what could go wrong would lead to 'underexposed' rather 'overexposed' pictures, but I can see how things could go awry. I have not had much experience with flashes, so my naiveté is that the iTTL should work. Of course in my case it is not working so... The solution may be to just use this flash in manual mode - just like the 'professionals'. [/QUOTE]
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YN-468 II overexposes when using iTTL
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