Magnification (binoculars) and Optical Power (eyeglasses) (1 Viewer)

[Ted Y.]

Let say I am using eyeglasses having optical power +4.
This corresponds to a magnification of 2x. (I am not sure, but this is secondary)
If I am using a 10x binocular without the eyeglasses, it's like using a 8x binocular (by a person who does not need optical correction).

I am just downgraded the binocular from 10x to 8x.
Is this downgrade a reality?

For the conversion formula:

Optical Power (Diopter) to Magnification (X) Converter • Photometry — Light • Compact Calculator • Online Unit Converters

Optical Power (Diopter) to Magnification (X) Converter measurement compact unit conversion calculator.

www.translatorscafe.com

 

[Ted Y.]

no one?

 

[Mono]

There is a discussion of the effect in this thread. There are changes to magnification but they are not that great.

Effect of glasses on magnification and apparent field of view

Here I present the results of a quick analysis of the effect of glasses on magnification and apparent field of view. I used a Swarovski 8.5x42 EL SV FP and an iPhone 5 mounted on tripods taking photos of the image through the binoculars with no glasses, -2.75 prescription glasses and +3.50...

www.birdforum.net