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Best advice from a rookie myself is to shoot in raw and then edit everything later on the comp.
+1. RAW, then edit in lightroom or photoshop.
The main thing that you will need to learn technique-wise, is using the proper shutter speed, aperture, focus, and lens.
Whats a good lense for reef? 24-105 mm?
Whats a good lense for reef? 24-105 mm?
I have a 50mm and a 100mm F2.8, a little pricey for these lens but well worths it.
I have the canon 4ti and use a 18-135 lens most often. I shoot in RAW, I do use the WB by taking a picture of the sand bed for setting it. This lets me use some pics without photoshop if I'm not in the mood for a long editting session. I keep my ISO low, 200-800. Then I use F-stop and shutter speed accordingly. You can skip the F-stop and only use shutter speed until you get more used to the camera.

Look in to Tamron 90mm f/2.8 for Macro photos. (If your camera body doesn't have an auto focus motor, you will need the AF version of the Tamron).
Otherwise most standard lenses will do. A simple 18-55mm kit lens will get you by when you are getting familiar with the camera.
My recommendation for you, as I've a Nikon guy but helped another reefer the other day that owns the same camera.
Set the camera on manual with the settings below:
ISO: 400
Aperture: f/5.6 (Lowest setting possible)
Speed: 1/100
White Balance: Cloudy (I think, whatever has the highest K rating which I remember was at 7000k)
Focus Points: Manual Selection
Shot everything in RAW format, it gives you more detail to play with.
At this point, decent lighting should be ok. Use your meter -2,-1,0,1,2 to see where the exposure is at. This is a bit tricky because the meter is showing the whole picture and if your shooting against a black background, obviously the meter is incorrect. Shoot and adjust your shutter speed accordingly till you get what you like. Use manual focusing point and not auto select. This will let you focus on what your trying to take a picture of. Last but not lease, the kit lens is a very powerful lens when it comes to taking pictures. Before you run out and buy a new expensive lens, master the kit lens first. This is just breaking the ice and I can go into more detail but it would just confuse you like most others who seek advice.
Also, last step would be use Lightroom to correct the white balance as your camera can not correct it in most cases. You can also crop, edit colors, and brighten the phot as needed.

