Q: For Vespers with exposition and benediction should the altar and people also be incensed during the Magnificat?
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A: Holy Communion and Worship of the Eucharistic Mystery outside Mass doesn’t address this directly, but it does permit vespers during adoration, and the only alteration pertains to the final blessing (no. 96).
So, I’d say the altar and people may be incensed during the Magnificat, though it would not be required.
You can find more in my book Eucharistic Reservation.