[Paddlewise] Fw: Tasco Binoculars

I hope I am not misunderstanding the post below but just as a precaution let
me say that "eye relief" has NOTHING to do with how much correction there is
["diopters"] or how "far" the binoculars will focus, etc.  "Eye relief" is
the distance from the ocular lens [the one closest to the eye] to the point
where the image is formed.  [If you take your binoculars to a strong
light-source and hold them with their objective lenses toward the light
source and place a piece of paper so that the light from the light source
that comes out the ocular lenses falls on the paper, and then move the paper
back and forth until the image on the paper is in sharp focus, the distance
from the paper to the ocular lens is the amount of "eye relief."]

 LONG "eye relief" [19 mm or more; the more the better] will allow the
eyeglasses wearer to see THE ENTIRE FIELD OF VIEW; short eye relief causes
one wearing eyeglasses to see a considerably NARROWED field of view.

- Bill

 ----- Original Message -----
> From: "Michael Daly" <michaeldaly_at_rogers.com>
> Subject: Re: [Paddlewise] Tasco Binoculars
>
> > From: "Steve Holtzman" <sh_at_actglobal.net>
> >
> > > The eye relief is 17 mm but I found it is more comfortable to not roll
the eye cups down and just sort of push my glasses up slightly.
> > >
> > I've noticed that there is considerable variation in the degree to which
binocs are able to "overfocus".  ...  That means that those of us that are
nearsighted can sometimes focus past the normal infinity point and use them
without glasses!
> >
> > ... I find that in the small aperature range of roughly 7x20 to 10x26,
they tend to correct around -4 to -6.  My Bushnell 8x25 Anglers are close
to -6 so I can more or less use them without my glasses.  Note that -6 is
the extreme and -4 is more typical.
> >
> > ... - the higher the magnification, the more correction possible as a
crude rule of thumb.  ....
> >
> > So, if you wear glasses, this might be an additional feature to look for
when trying out binocs.  If they can correct so that you can use them
without glasses and you don't mind pushing your glasses up, the eye relief
becomes less important.  ...  > >
> > Mike


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