Which one are you referring to?



The top left examples are not providing much of an increase in the size of the source light so the shadow edges will not be significantly softened. The light is then diffused so it covers a wider area, potentially filling in the shadows from light bounced from things outside the field of view. I should note that my speedlights (Nikon SB800 or SB910) have built in focusing and they interact with the camera to change the area illuminated as you change the focal length. Diffusers will reduce the light on the subject so the flash will have to work harder. Only a problem if you are taking shots at a rapid pace.

These diffusers separate the light source from the camera a bit more, which will reduce redeye effects. But the ceiling is a LOT further away from the camera (usually).

If there is a viable ceiling, that is in my opinion the best thing to use. The only limitation is if the ceiling is not close to white. Strong colors will give you problems with white balance. Pastel colors are probably something you can mitigate in post.

Probably not.

I went to a wedding a couple decades ago. The ceilings were 30' high so I thought bounce wouldn't work well and I made a diffuser for the speedlight.



Just see how professional it looks!!!!!!!!

It softened the shadows a bit but did not eliminate them. Have used 15' ceiling bounce and it seems to work well.

If it works for you, don't fix it. (But feel free to experiment to see for yourself -- the paper is card stock so it is stiff enough to hold up by itself. Cost is minimal).

I'm not familiar with Canon but modern cameras do high ISO pretty well so even 30 foot ceilings might be OK. High ISO will help the flash by reducing the load and minimizing any heating with frequent shots. Go to the venue and take some test shots to try it out (or just go to an event early).

Sorry ladies but it is funny!!!!!!
WE ALWAYS HEAR 'THE RULES' FROM THE FEMALE SIDE
NOW HERE ARE THE RULES FROM THE MALE SIDE
THESE ARE OUR RULES!
... PLEASE NOTE. THESE ARE ALL NUMBERED #1 ON PURPOSE!
1. MEN ARE NOT MIND READERS.
1. LEARN TO WORK THE TOILET SEAT. YOU'RE A BIG GIRL. IF IT'S UP, PUT IT DOWN. WE NEED IT UP, YOU NEED IT DOWN. YOU DON'T HEAR US COMPLAINING ABOUT YOU LEAVING IT DOWN.
1. CRYING IS BLACKMAIL.
1. ASK FOR WHAT YOU WANT. LET US BE CLEAR ON THIS ONE:
SUBTLE HINTS DO NOT WORK!
STRONG HINTS DO NOT WORK!
OBVIOUS HINTS DO NOT WORK!
JUST SAY IT!
1. YES AND NO ARE PERFECTLY ACCEPTABLE ANSWERS TO ALMOST EVERY QUESTION.
1.. COME TO US WITH A PROBLEM ONLY IF YOU WANT HELP SOLVING IT. THAT'S WHAT WE DO. SYMPATHY IS WHAT YOUR GIRLFRIENDS ARE FOR.
1. ANYTHING WE SAID 6 MONTHS AGO IS INADMISSIBLE IN AN ARGUMENT. IN FACT, ALL COMMENTS BECOME NULL AND VOID AFTER 7 DAYS.
1. IF YOU THINK YOU'RE FAT, YOU PROBABLY ARE. DON'T ASK US.
1. IF SOMETHING WE SAID CAN BE INTERPRETED TWO WAYS AND ONE OF THE WAYS MAKES YOU SAD OR ANGRY, WE MEANT THE OTHER ONE.
1. YOU CAN EITHER ASK US TO DO SOMETHING OR TELL US HOW YOU WANT IT DONE. NOT BOTH.
IF YOU ALREADY KNOW BEST HOW TO DO IT, JUST DO IT YOURSELF.
1. WHENEVER POSSIBLE, PLEASE SAY WHATEVER YOU HAVE TO SAY DURING COMMERCIALS.
1. CHRISTOPHER COLUMBUS DID NOT NEED DIRECTIONS AND NEITHER DO WE...
1. ALL MEN SEE IN ONLY 16 COLORS, LIKE WINDOWS DEFAULT SETTINGS..
PEACH, FOR EXAMPLE, IS A FRUIT, NOT A COLOR. PUMPKIN IS ALSO A FRUIT. WE HAVE NO IDEA WHAT MAUVE IS.
1. IF WE ASK WHAT IS WRONG AND YOU SAY 'NOTHING,' WE WILL ACT LIKE NOTHING'S WRONG. WE KNOW YOU ARE LYING, BUT IT IS JUST NOT WORTH THE HASSLE.
1. IF YOU ASK A QUESTION YOU DON'T WANT AN ANSWER TO, EXPECT AN ANSWER YOU DON'T WANT TO HEAR..
1. WHEN WE HAVE TO GO SOMEWHERE, ABSOLUTELY ANYTHING YOU WEAR IS FINE...REALLY.
1.. DON'T ASK US WHAT WE'RE THINKING ABOUT UNLESS YOU ARE PREPARED TO DISCUSS SUCH TOPICS AS FOOTBALL OR MOTOR SPORTS.
1. YOU HAVE ENOUGH CLOTHES.
1 .. YOU HAVE TOO MANY SHOES.
1. I AM IN SHAPE. ROUND IS A SHAPE!
1.. THANK YOU FOR READING THIS. YES, I KNOW, I HAVE TO SLEEP ON THE COUCH TONIGHT.. BUT DID YOU KNOW MEN REALLY DON'T MIND THAT? IT'S LIKE CAMPING...
PASS THIS TO AS MANY MEN AS YOU CAN - TO GIVE THEM A LAUGH...😂
PASS THIS TO AS MANY WOMEN AS YOU CAN - TO GIVE THEM A BIGGER LAUGH, BECAUSE ITS TRUE!....😉