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From my understanding with astrophotography many use small apertures compared to visual astronomy. They use refractors, easier to hand, dont need as heavy duty mounts, no collimation and better sharpness and no centre obstruction. If aperture was the main issue then all astrophotographers would have hugh apertures, but simply don't.
The aperture comes into play with planetary, with astrophotography you put your money into the mount first, and aperture less concerning.
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