dealszhumell 25x30 bring em near pirate spyglass for…

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@gidgaf: It's obviously a toy!! LoL!!

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There's formulae for this.
Google-fu will work for you.

ANYway, the lens is too small for the mag.
It's a cute gift, but a poor tool.
Another way to look at this, look up Barska rifle scopes.
No, they ain't brass. But the advertiser will tell you things like why your view looks like crap if the magnification is too high for a small lens.
For 25 power, I'd like to not get less than a 60mm lens. And even then I'd have to hold very still.