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Optically there is no comparison. The 12" eats the 8" but its bigger, heavier, has a larger storage footprint and is harder to transport.
For AP the 8" would be great to learn on. It would allow you to perfect your alignment, learn the capture software/hardware and image processing. If you really get into it then a heavier mount for the 8" would be easier on both the pocket and back.
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