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Then of course there are the "photon-hogs" with enormous apertures like the SDM and Obsessions with fast apertures that just suck up even their neighbours photons, just not fair.
Fast scope are great for imaging, as a shorter 'exposure' time means the image is less likely to be affected by image shift, changing seeing conditions, etc etc.
Slow scope have their place though, speed is not everything....usually fast lenses have a smaller 'in focus' zone.
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