Reply to Lyn & Carl
When you can't see inside your camera viewfinder, if you are in focus, then
see, if your camera body has a 'focus beep' setting. Then you know by ear,
if you are in focus. Some bodies can also be set to only fire, when you are
in focus ('focus trap'). Finally, many camera bodies have a built-in,
sliding diopter adjustment for your focusing eye. This you can set for your
focusing eye with or without wearing your specs. You can also buy a fixed
screw-in diopter for many camera viewfinders. I always use a rubber,
screw-in viewfinder hood; these generally work fine also when you wear
glasses.
Cheers, Jim Schultz, Kelmscott WA
-----Original Message-----
From: Birding-Aus On Behalf Of
Carl Clifford
Sent: 16 July 2016 4:09 PM
To: Lyn Saint
Cc:
Subject: Glasses or not ......
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.
https://en.m.wikipedia.org/wiki/Eye_relief
Cheers,
Carl
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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