Need settings for nephews wedding pics with Canon 5Dmk3

I am going to my nephews wedding and I will be using a Canon 5Dmk3, 24-70 2.8mk2,
600ex-rt on a bracket. I am not the wedding photographer but my family asked me to get some pics. I planned on ISO 320 or 640 and manual of 1/125 and f5.6 and the flash in ETTL or manual. I dont know the venue so I have no idea if I can bounce the flash. If not any diffuser like an omnibounce or Gary Fong?? Am I even close with the settings? Any suggestions would be appreciated. I wont be doing any artistic shots just candids

gqllc007 wrote in post #17722353
I am going to my nephews wedding and I will be using a Canon 5Dmk3, 24-70 2.8mk2,
600ex-rt on a bracket. I am not the wedding photographer but my family asked me to get some pics. I planned on ISO 320 or 640 and manual of 1/125 and f5.6 and the flash in ETTL or manual. I dont know the venue so I have no idea if I can bounce the flash. If not any diffuser like an omnibounce or Gary Fong?? Am I even close with the settings? Any suggestions would be appreciated. I wont be doing any artistic shots just candids

No blanket settings apply here.

You have to meter each area you're shooting in, be it inside, or outside. And if you're going to be blasting flash, I would just keep it to bounce (ETTL) and not directly at people, so no modifier needed.

Very best,

I should have clarified that it will be inside and the flash will be the dominant light

To be honest if you are asking this question you'd be best sticking with the green box.

Any suggestions we give you could be horribly wrong once you get onsite. Green box might be your best bet.

Thanks for the help! Never used the green box before I didn't even know my 5Dmk3 had one! I wonder if my 5DsR has one too?

gonzogolf wrote in post #17722422
Any suggestions we give you could be horribly wrong once you get onsite. Green box might be your best bet.

I was just looking for a starting point!

gqllc007 wrote in post #17722442
I was just looking for a starting point!

I understand, but there is a whole universe of ambient lighting conditions to deal with. There is no generic starting point. This is where you need sufficient understanding of the challenges to decide what to do.

There aren't any starting points, that is the point. And the fact you are asking for a starting point indicates the camera doing as much as possible for you would be your best bet for the best results.

gqllc007 wrote in post #17722442
I was just looking for a starting point!

Here you go. If indoors, start at ISO 2500. f/4 @ 1/200 sec. If shot is too light (over exposed) lower ISO until you get correct exposure. If shot is too dark, go to f/2.8 and/or 1/100 sec. If still too dark, go to ISO 3200. Bounce flash.

jcolman wrote in post #17722467
Here you go. If indoors, start at ISO 2500. f/4 @ 1/200 sec. If shot is too light (over exposed) lower ISO until you get correct exposure. If shot is too dark, go to f/2.8 and/or 1/100 sec. If still too dark, go to ISO 3200. Bounce flash.

Got it! Thanks!

You own a 5Dmk3, 5DsR and the 25-70 II and you are asking these questions? And if flashing away, how do you think the photographer hired to do the job is going to feel when he shows up with his 7D or 60 D (no insult to those camera's) and you are there with that gear. Even doing just candid's, Seems to me an issue or worse, a nightmare waiting to happen.

Might re-think how you are going to use them or maybe ask to speak to the photographer before the wedding to let him know what you are doing so he is not surprised. Would probably be the best way to handle this.

backing up Amadauss, be sure to check with the hired hand before venturing off to do whatever. Your actions can seriously effect the outcome of their product (what the B&G paid for). May not be an issue if they did not hire anyone, but if they did...

What everyone else is saying is so true regarding your settings. The reason you hire a pro is this type of an event is so dynamic and you must be able to change your settings on the run in manual.

For you, (first check with hired hand for flash) set up in AV. For your ISO go with maybe 400 or so if outside and 800 if inside. Or use auto to get a base setting then adjust from there. If you want background go with a smaller aperture (higher number), and if your focusing on subjects up close a higher one (lower number). Basic basic basic. Be sure to adjust your exposure for your setting. This is easy in Av, just click the shutter button and roll the wheel. During the reception kick up your ISO. Dont bother with Tv.

Your not being paid, so whatever you come up with will be a bonus

Yes I have this gear and I have been doing photography for over 30 years. However I never take photos indoors unless using a point and shoot. I do outdoor photos, wildlife, portraits, landscapes or sports with high ISO indoors and no flash hence why I asked the questions,
I plan on staying completely out of the way of the hired photographer.
In The external flash setting had auto, 1/60-1/200, and fixed 1/200. I figured either 1/60-1/200 to prevent movement but do you suggest auto in the external setting so even if the shutter speed is slow the flash will freeze any movement and using the flash as just a fill?

Sorry, you seem a bit defensive. Your OP kind of insinuated you are new at this and were looking for advice on basic settings. You have been doing photography longer than me unless I count the first time I used a camera at all, then I can say I've been doing it for 40 years (I think I was 5). I've been doing photography professionally for about 3 years now. I do get the question though I recently asked for some advice on doing shots in a winery for an engagement shoot I had coming up. The atmosphere there and the low light were going to be a challenge and I was looking for more for a mind picking discussion. But perhaps you should have worded it that way. Anyway I think you can figure it out once you get there with what experience you have. It will all come together I'm sure, it did for me with the winery.

Best of luck.