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Hi jjjnettie,
By all means try placing an aperture stop in front of the lens, but take a close look at the stars in your images afterwards because you may find it causes a few issues:
a) it almost certainly will produce vignetting (dark corners)
b) it may make coma worse for off-axis stars, and
c) it may make lateral colour aberrations worse (ie stars are stretched into radial coloured streaks).
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