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There is also a big difference in the mass of the 12" and 16" mirror - and as it is not low expansion glass ( similar to plate glass ) you will get better images for lunar and planetary with the 12" which will be closer to seeing limited on good nights ( assuming you have good optics in the first place ) .
An aperture stop will give a superficially more stable `sharp' image on poor nights but you will always see just as much without a stop as with one ( assuming again that the edge zones of the mirror are good )
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