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If its too small the illumination on your large eyepieces will drop off noticably toward the outside. So not only seagulls but dim ones at that.
Tha advantage of the correct sized secondary is increased contrast so you get to split that close double easier, see more individual stars in Omega Centuri and the festoons on Jupiter.
Get NEWT if for nothing more than the Help section which explains a lot of this.
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