Canon Macro Twin Light MT-26EX-RT Instruction Manual page 26

Adjusting the Flash Unit
Using a Hood
When mounting a dedicated hood (sold separately) to the MP-
E65mm f/2.8 1-5x Macro Photo or mounting the Lens Hood ES-27 to
EF-S35mm f/2.8 Macro IS STM, first attach the hood, then attach the
mount ring. If a hood is attached, a 58 mm filter cannot be attached
to the filter mounting thread of the mount ring.
With the EF100mm f/2.8 Macro USM, the Lens Hood ET-67 can be
attached to the mount ring's hood mount. Use ambient light for
shooting. Using flash will result in darkened edges.
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