You do mean "76 mm" diameter, I believe.  That is already pretty big but 
sounds about right for F4.5 in 10" focal length.

Bob


At 21:38 20.03.02 -0800, you wrote:
>Hi there, ho there!
>
>I've just picked up a set of Ilex Paragon Anastigmat
>4.5/10" (254mm) elements without a barrel or a
>shutter... So I have a couple of questions:
>
>Could I make a barrel & attach the whole thing on a
>board with a Packard shutter?
>
>If this sounds workable- then, what should I use to
>make the barrel & how do I figure the distance from
>the front to rear elements?
>
>If this gets to be too complicated/expensive I would
>probably want to pick up a shutter... anyone know
>which shutter would fit for these elements? The
>elements have a 76cm diameter, not sure of the thread.
>
>Thanks!
>John Moore
>Ramona, CA
>
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