Glasses or not ......

To: Lyn Saint <>
Subject: Glasses or not ......
From: Peter Shute <>
Date: Sat, 16 Jul 2016 10:54:24 +0000
Another thought - is this a new lens for a camera you've already been using 
successfully with other lenses? If so, is it possible that the lens is faulty, 
and can't focus sharply? Or is just not as sharp as you're used to?

Is it a Canon mount lens, or have you fitted an adapter to some other type of 
lens? Some lens/camera/adapter combinations can't focus to infinity.

Finally, is it just darker than you're used to compared to a faster lens you 

Peter Shute

Sent from my iPad

> On 16 Jul 2016, at 1:18 PM, 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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