Glasses or not ......

To: Lyn Saint <>
Subject: Glasses or not ......
From: Carl Clifford <>
Date: Sat, 16 Jul 2016 08:08:56 +0000
It is not much help to you now, but always check what the Eye Relief of a
pair of bins before you buy. You need to have an eye relief of at least
18mm to use bins with glasses. I put up with the same problem for years,
constantly having to flick my specs off and on again, when out birding.
Now, all my bins and scopes have eye relief of 20-22mm. So much easier.
Some makers' bins seem to be mainly under 18 mm, while others tend to be
fairly long, and a good choice for 'specs wearers. My personal choice is
Pentax, who's bins and scope eyepieces tend to be longish in eyerelief. My
10x50 Pentax bins are 22mm ER. No problem with specs.

For those who are wondering WTF is this eye relief he is rabbitting on
about, here is the google link for the full skinny.



On Saturday, July 16, 2016, Lyn Saint <> wrote:

> Hi Everyone,
> I have a bit of a quandary at the moment. I have acquired a Sigma 100-400
> mm lens for my Canon 7D and often find it difficult to determine if the
> bird is in focus or not. I can't see clearly enough through the lens.
> I have glasses but have also purchased and am using a dioptric adjustment.
> This is good but annoying as I need to have my glasses on to find the bird
> and then have to whip them off to focus though the lens.
> For those of you who have this issue with glasses, do you have any advise
> on this issue?
> Frustrated,
> Lyn
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