> The worst case I know of was a guy observing the sun using a refracting
> telescope with heavy ND filtration at the eyepiece. But the eyepiece
> heated up so much that the lens elements heated up inside the confines
> of their cells and expanded until the glass exploded. True? Can't be
> internet lore... it didn't exist at the time. :-)
Likely. If nothing else, expect an element or two to break. This was a
common problem "back in the day" when home darkroom setups done
on-the-cheep would utilize the same lens for the enlarger as for the
camera. Unfortunately, the typical camera lens of the '40s and '50s
didn't have the ability to withstand heat like an enlarger lens. An
unfortunate destruction of the lens would result.
--
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|