I find the 500mm f8 lenses hard to focus. The focal length + f8 aperture
limit it to a few focus screens (1-8, 1-7, 2-4 in my experience) Celestron
has a 750mm f6 that is much easier but also bigger but still light weight.
-jeff
----- Original Message -----
From: "Luca A." <lucaarnu@xxxxxx>
Subject: [OM] Re: Tamron 500mm f:/8,0
>
> I would use it for aircraft pictures (in flight), so the out of focus
> doesn't matter so much.
>
> Luca
>
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