Lets assign some somewhat arbitrary figures for percentage of total light emitted from a diffuser such as Stofen...25% from each of the larger faces, 12.5% from each of the smaller sides. Now let us examine the distribution in the situation you described:
- Head upward: 25% upward, 25% forward, 25% backward, 12.5% out to each side
- Head forward: 25% upward, 25% downward, 25% forward, 12.5% out to each side.
So in #1, the 25% upward is wasted by the bad ceiling, and the 25% backward is wasted out the wrong direction; in a small room the 12.5% out to each side might be useable if not badly contaminated by strongly colored walls. So only 25% is truly useful light, when ceiling and walls are poor color or too far...
you are wasting 2EV of the light, so consuming your battery faster!
And in #2, the 25% upward is wasted by the bad ceiling, the 25% downward is like wasted as well (blocked by people standing in front of the bounced light), in a small room the 12.5% out to each side might be useable if not badly contaminated by strongly colored walls. So only 25% is truly useful light, when ceiling and walls are poor color or too far...
you are also wasting 2EV of the light, so consuming your battery faster!
In short, it does not matter the flash head orientation, you are wasting lots of light, and likely the same amount of light in both cases. So now you see the (lack of) wisdom of the so-called pros seen shooting with those plastic Tupperware things that they paid lots of money for in some cases.
Here is a much less expensive way of wasting light, and more nutritious.
https://photography-on-the.net …p?p=15545315&postcount=10And here is a real use of that source...
https://photography-on-the.net …p?p=15550109&postcount=18And here is my own collapsible version of an even larger and softer source...
https://photography-on-the.net …p?p=15940870&postcount=23Oddly, after offering them for sale on POTN, no one ordered any of these from me. I gotta tell Brad Pitt that no one was impressed by the fact that my modifier would make me look like him in a photo!
