Size of objective lens for refractor telescopes

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What can I see with suitable size of objective lens for a refractor telescope?

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Size of objective lens for refractor telescopes

70mm
– the minimum size for good views.
– starts to show more detail on the planets.

80mm
– good size for detailed views of the planets.
– starts to show detail in the detail!

90mm
– excellent detail level on the planets and good views of all objects.
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100mm
– bright planets like Jupiter, Saturn, and Mars shine bright in the 100mm reflector.
– even when viewing from urban locations with mediocre seeing conditions.
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110mm
– the 110mm refractor excels in both deep-sky imaging and wide-field observing.
– the 110mm aperture, combined with extra-low dispersion (ED) FPL-51 glass.
– it offers great colour correction, as well as crisp images and fantastic views.
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120mm
– all telescopes loose contrast, and refractors are no exception.
– the smaller the telescope, the more contrast is lost.
– however, the increase in contrast transfer between a 100mm and a 120mm scope is only about 20%.
– meaning 100mm refactor telescope which is far less than the gain in light gathering in 120mm scope.
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For the Astrophotography – Imaging

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Sky-Watcher Esprint 80ED / ZWO ASI1600M (Mono)

Astrophotography
Messier 31 (Andromeda Galaxy)
by Derek Rowley

Equipment

  • Telescope: Sky-Watcher Esprit 80ED
    Focal length: 400 / Aperture: 80mm diameter
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  • Camera: ZWO-ASI1600 Mono (Black & white)
    Resolution: 4656px x 3520px / Pixel size: 3.80µm x 3.80µm
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Sky-Watcher Esprint 80ED / ZWO ASI2600MC-Pro (Colour)

Horsehead & Flame Nebula
by Derek Rowley

Equipment

  • Telescope: Sky-Watcher Esprit 80ED
    Focal length: 400 / Aperture: 80mm diameter
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  • Camera: ZWO-ASI2600MC-Pro (colour)
    Resolution: 6248px x 4176px / Pixel size: 3.76µm x 3.76µm

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