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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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 own?
Peter Shute
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I just wear my glasses. If you can’t tell if it’s focused with your glasses on, does that mean you need new glasses? Also make sure you’re looking through the middle of your glasses, as the edges may cause distortions.
Looking through a viewfinder with glasses on is annoying because you can’t see the edge of the frame, but if you need them to see birds, what choice do you have?
I’ve added a 1.3x viewfinder magnifier, which helps with manual focusing, but makes it even harder to see the edges.
Peter Shute
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