What are the differences between these two? Which one is for underwater macro photography?

LG-1 LED Light Guide

Model: V335480BW000UPC: 050332193864

OM SYSTEM

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" essential tool for improving lighting in macro photography"

 

FD-1 Flash Diffuser

Model: V335470BW000UPC: 050332193857

https://explore.omsystem.com/us/en/fd-1-flash-diffuser

" designed to soften the lighting in close-up photography"

This is what ChatGPT says:

they are quite different accessories for the TG-series cameras such as the TG-7.

FD-1 Flash Diffuser LG-1 LED Light Guide

Light source Built-in flash Built-in LED

Light Short, powerful flash Continuous light

Macro stills Better Good, but less powerful

Video Not useful as continuous light Excellent

Underwater Yes Not useful underwater

Working distance About 2–30 cm About 1–10 cm

Light control Two flash levels No separate control

Best for Underwater/macro photography Macro/video and very close subjects

OM System specifically describes the FD-1 as a flash diffuser that gives softer, more even illumination and lists it as compatible with the TG-7, TG-6, TG-5 and TG-4.

For your underwater photography

I’d choose the FD-1 without hesitation.

The important advantage is that it uses the TG’s flash, rather than the relatively weak LED. That gives you enough light for faster shutter speeds and lower ISO, which is particularly useful for underwater macro where you want to freeze subject movement. OM System also specifically confirms that the FD-1 can be used underwater.

The LG-1 is really more of a macro/video light guide. It takes the camera’s LED and distributes it around the lens. It’s particularly useful when you need to see the lighting continuously while composing video.

So, if you’re using a TG-7 for underwater stills, get the FD-1.