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I would buy the f/5 not the f/4. The f/4 is more for those intending to do imaging, not optimal for visual use for two reasons - the secondary mirror is comparatively larger (bad) and while some eyepieces are OK at f/4, many are not.
The f/5 is better for visual use. f/6 or f/7 even better, IMHO, if you can accommodate the longer length of the optical tube assembly.
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