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Just a general caution when using telescopes on Mercury or Venus while the Sun is still in the sky.
You may have the scope pointed at the planet but sunlight can still enter your scope. Sunlight on the primary mirror is extremely dangerous.
See diagram ...
Set up your scope in such a way the Sun will be blocked from view as it sets (e.g. behind a wall) but the planet is still visible.
Better still, wait till the Sun sets.
Regards, Rob
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