I would consider the 130mm, f5 with 650mm focal length to be what is called a 'Rich Field Telescope' (RFT). This type of telescope excels in low power wide field viewing of star fields such as can be found in the Sagittarius or Carina regions.
This telescope will perform best with a quality wide field (say 65-70 deg) low power (approx 20-25mm) eyepiece.
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