On 7/18/2008 4:40 AM John spake thus:

Have a later version Metrogon.

Note the picture showing the rear internal and external surfaces that
face the film. The aperture stop and the internal surrounding rear parts
are WHITE.

I have never seen this before. What could the rationale be? Has the
manufacturer (Fuji in this case, I think) have discovered something
counterintuitive but useful?

See pictures he
http://www.digoliardi.net/metro/met1.jpg
http://www.digoliardi.net/metro/met2.jpg
http://www.digoliardi.net/metro/met3.jpg
http://www.digoliardi.net/metro/met4.jpg

Heed the 'Stones song: Paint It Black.


--
"Wikipedia ... it reminds me ... of dogs barking idiotically through
endless nights. It is so bad that a sort of grandeur creeps into it.
It drags itself out of the dark abyss of pish, and crawls insanely up
the topmost pinnacle of posh. It is rumble and bumble. It is flap and
doodle. It is balder and dash."

- With apologies to H. L. Mencken