> I don't know about a focusing loupe but any tightly woven no lint black
> cloth should do. The heavier and finer the weave the better. Probably a
> good try would be raincoat material. You want it pliable and easily
> foldable. You could use fake leather or bookbinding material but this is
> awkard to fold making packing a difficulty but perhaps more importantly
> folds and the hang of the material do create natural light traps which will
> make focusing easier, especially in conditions of bright light.
>
> alexis
Some of the commercial focussing cloths are black on one side and white or
silver on the other side to prevent it from getting too hot under the cloth
when you are out in bright sun.
