Yong Nuo ST-E2 transmitter makes my closeup pics have a red tinge

http://www.yongnuoebay​.com/sm/ste21.pdf

Is there a way to turn off the red light labeled transmitter in the manual nomenclature?

when i take pics with direct flash, it's not visible, but when i bounce my speedlights, there's a red tinge on my pictures.

i could also just rotate the ST-E2 to another direction

but i'd like to find the right way to turn it off.

bonus question, i just read that this ST-E2 is not 5D3 compatible ... is that right?

Focus Assist turns off immediately after focus is achieved so it's not affecting your images. You must be bouncing off of a surface that has red in it.

Sorry, youre right. Its not the fa beam. It"s the red light from the top of the st-e2. Labelled as transmitter in the manual.

If you're convinced it's the communication beam, try using a faster shutter speed and smaller aperture. If you try to block it or turn it off, you'll lose the functionality of the ST-E2. If you're already using a fast shutter speed and small aperture, it's not the beam.

Unless you're using slow shutter speeds, wide apertures, and high ISO to let in a lot of ambient, that beam shouldn't be bright enough to affect your flash images.

I've been using 1/60 f/2.8-f/8 1600-3200

Which should i change?

When shooting at far objects using the same settings, the red doesnt affect the image, its when im close up that the transmitter beam lights up the object.

the rectangular red light at the top is the transmitter affecting my closeup shots
the circular one at the bottom is the focus assist beam