Flash Sync Problem

[lennon33x]

It's out of focus. I shot at 1.4. The DoF is so shallow it appears as motion, but is out of focus. Had motion blur occurred, the balloon would have been moving at the point of impact, especially with a knife that sharp

 

[gsgary]

It's out of focus. I shot at 1.4. The DoF is so shallow it appears as motion, but is out of focus. Had motion blur occurred, the balloon would have been moving at the point of impact, especially with a knife that sharp

That's bull**** first shot nothing is in focus because of motion blur, my first shot was F9 and second F11 you have proven nothing

 

[lennon33x]

Whoa whoa man. No need to get so mad. We are just talking theories here.

Scientifically speaking, the more variables you have the more errors that can occur. So, since we were talking about a change in shutter speed, I kept everything except shutter speed the same (with the exception of ISO so that I could correctly expose).

And based on more scientific principles, the DoF is, on a FF 5D, at 85mm, with a subject distance of 3 ft, is about 0.5 inches (and I'm being generous) at f/1.4. That knife is about 8 inches long and my hand is coming from the front. That gives significant reason to believe that everything is out of focus at that working difference.

Just because you think you're right doesn't mean that everyone else is wrong. This is the internet after all.

 

[gsgary]

Whoa whoa man. No need to get so mad. We are just talking theories here.

Scientifically speaking, the more variables you have the more errors that can occur. So, since we were talking about a change in shutter speed, I kept everything except shutter speed the same (with the exception of ISO so that I could correctly expose).

And based on more scientific principles, the DoF is, on a FF 5D, at 85mm, with a subject distance of 3 ft, is about 0.5 inches (and I'm being generous) at f/1.4. That knife is about 8 inches long and my hand is coming from the front. That gives significant reason to believe that everything is out of focus at that working difference.

Just because you think you're right doesn't mean that everyone else is wrong. This is the internet after all.

You dont need to tell me about 5d i have one altering ISO higher can let ambient light into the shot you should know that

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[lennon33x]

The room was virtually pitch black.

 

[gsgary]

The room was virtually pitch black.

Why did you use f1.4

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[lennon33x]

To separate my subject from the background. It was placed in a bathtub

 

[gsgary]

To separate my subject from the background. It was placed in a bathtub

Placement of lighting seperates your subject from background with studio lighting

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[lennon33x]

I was limited on space (as I did not want to get water everywhere), so I used my aperture to adjust DoF vs lighting. I also did not want to set up any light modifiers, other than the snoot I used