[Leica] 50 mm lenses

[don.dory at gmail.com (Don Dory)]

Greg,
Don't worry about the film.  The radioactive elements are in the first group
and the elements in the last group all contain significant quantities of
lead so the radiation exposure at the film gate from the glass is less than
background.  Really, unless you use your lens as a loup all day there is no
reason to be concerned about radiation exposure from the lens.

Don
don.dory@gmail.com


On 5/24/06, GREG LORENZO <gregj.lorenzo@shaw.ca> wrote:
>
> Don Dory writes in part:
>
> >
> > It really doesn't matter, the signature of both sets of lenses is very
> > similar with the latter design somewhat superior as they could use
> > the high diffraction elements in the last group when it became radiation
> free.
> >
>
> Don,
>
> What makes it worth knowing is whether you can safely leave this lens
> mounted on a camera with film still in it. I keep mine away from both my
> eye, my film canisters and any camera stored with a partially exposed roll.
>
> ...checking my film stash for some older unexposed slide film now.
>
> Regards,
>
> Greg
>
>
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