Oly 150-400, what does this button set?

Started 4 weeks ago | Questions thread
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MarkDavo
MarkDavo Senior Member • Posts: 2,165
Oly 150-400, what does this button set?

I noticed this button yesterday.  What is its function?  Who uses it and to what benefit?

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Cheers, Mark
Wouldn't be dead for quids

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