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Binoculars 8 x 21, 128m/1000m

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Maggoty | 15:56 Mon 03rd Sep 2012 | Technology
3 Answers
I know that the 8 x 21 means 8 Magnification X 21mm objective (front) lens. But what does the 128m/100m mean?

Thanks!!

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Avatar Image ChuckFickens
The width of the view at 100m will be 128m.
15:57 Mon 03rd Sep 2012
Avatar Image VHG
The field of view may be quoted in degrees or figures (such as 6.5° or 140 m at 1,000 m). Roughly, 1°=17 m at distance of 1,000 m.

http://www.rspb.org.u...noculars/figures.aspx
15:59 Mon 03rd Sep 2012
Avatar Image ChuckFickens
This shows it well
http://www.bestbinocu...ges/field-of-view.gif

(For reference 128m/100m is 384ft/1000ft)
15:59 Mon 03rd Sep 2012

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