I've agreed to do a very small wedding (approx 20 people). I'm doing informal/candid at and outside the church (plus the usual posed groups) and more informal shooting at the reception (pub). It's in August so a while away yet, half decent chance of good weather but you never know. I'll be using my A7 III and currently only have the 85mm & 70-200. I have wider lenses 14mm, 28mm, 35mm, 50mm, 55mm in manual focus forms but although I do a lot of manual focussing the pressure will be on which worries me a little
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Do you think I 'need' an AF zoom lens in the mid-range 24-70 etc? Or maybe a 35mm?
You are going to need something wider absolutely and no manual focus will be a complete nightmare.
Depends on your style really but this is what I use.
Sigma 35mm f/1.4, use this for about 60-70% of every wedding.
Sony 85mm f/1.4 G.M, use this for about 30% of every wedding.
Sony 16-35 f/4, I use this mainly for the dancing but occasionally will help get you out of a hole for hanging dresses etc.
Sony 90mm f/2.8 Macro, I use this for the rings, and other details. ( you can use other lenses for this of course )
I also have a 70-200 but it's pretty useless for weddings and I only use it for outdoor ceremonies.
My missus uses the Sony 24mm G.M and the Sony 55mm f/1.8 in the same way I use my 35 & 85.
Have you got another body? I always use 2 bodies at the same time, sometimes 3. It will be a hard day trying to shoot a wedding with one body and just primes. Plus what happens if the body dies mid wedding?
Do you have public liability insurance, very odd but it can happen that the venue won't let you through the door without it. I have only ever been asked for proof twice but might be something to consider. Also what happens if someone trips over a bag, lightstand etc.
What happens if you make a mess of it?
Forget the candid shots for a second, do you have any experience of shooting couples? groups of people?
Is the couple going to cover the cost of all of the additional equipment you are going to need to be able to shoot this?
What sort of lighting do you have?
What are the couples expectations?
Are you prepared for the amount of time and effort that will need to be put into editing and providing the images after the wedding? What if they want an album? Who are you going to use for that? Some suppliers will insist on evidence that you are a working wedding photographer before they will allow you to purchase form them, the better companies certainly do.
If you are already worrying about being under pressure, this isn't for you!
If this is one off favour for a friend or something and with the amount of equipment etc. that you are going to have to buy. It might be better to gift them a proper wedding photographer instead. Then go along on the day yourself, take your camera and one lens say a cheap 50mm, enjoy the day and shoot some candid stuff out of the road.