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Can you please explain me what is 4.5 - 5.6G in a lense description.And how it is different from other generation of like 3.5G or 6.5.

"Nikon AF-S DX NIKKOR 55 - 300 mm f/4.5-5.6G ED VR Lens"

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That simply refers to the Maximum Aperture of the lens.

The terms in that lens name are as follows:

  • AF-S - Auto Focus - Silent
  • DX - Designed for Nikon crop sensor bodies
  • 55-300mm - Focal length range of the lens
  • f/4.5-5.6 - Maximum aperture of the lens at min and max focal lengths
  • G - No manual aperture control on the lens, aperture must be controlled by the camera body
  • ED - Extra-Low Dispersion glass
  • VR - Vibration Reduction - basically reduces the effect of camera shake.

So generally none of that refers to the Generation of the lens, just the features and specifications of the lens. There may be a "II" on the end of some lens names indicating that it is the 2nd version of that lens.

There are other acronyms you will see from time to time, there is a good reference on the Nikon site: https://support.nikonusa.com/app/answers/detail/a_id/9919/~/glossary-of-nikkor-lens-terms

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  • The "II" designation is applied to successive versions of the same lens where the alphabet soup and basic specs are otherwise the same. The 70-200 f/2.8 and 18-200 f/3.5-5.6 are examples of where they did this; the three versions of the 24-120 that have been released over the last 20 years are examples of where they didn't. – Blrfl Jan 18 '15 at 15:49
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4.5-5.6 mean maximum aperture of the lens. It is variable so as you zoom it change, 4.5 at 55mm and 5.6 at 300mm.

G mean aperture is managed from the camera. You do not have aperture ring on the lens

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