Richard K.
7-Apr-2010, 14:26
Hi All;
Bought a very nice Universal Heliar 36 cm from a fine gentleman, which I got today. It's all fine and beautiful and hefty and impressive etc. but there emanates a rattle from the rear group where the cemented pair of lens elements sit a bit loosely in their enclosure. It was speculated that perhaps this is intentional to combat stress caused by the differential thermal expansion between glass and brass but I haven't seen this done deliberately in any other lens. I took the lens in to be fitted for flange by my flange man and he promply tightened something to eliminate the rattle. But now I'm wondering if that expansion latitude should be there else dire consequences might prevail? :confused: Any thoughts? Thank you. :)
Bought a very nice Universal Heliar 36 cm from a fine gentleman, which I got today. It's all fine and beautiful and hefty and impressive etc. but there emanates a rattle from the rear group where the cemented pair of lens elements sit a bit loosely in their enclosure. It was speculated that perhaps this is intentional to combat stress caused by the differential thermal expansion between glass and brass but I haven't seen this done deliberately in any other lens. I took the lens in to be fitted for flange by my flange man and he promply tightened something to eliminate the rattle. But now I'm wondering if that expansion latitude should be there else dire consequences might prevail? :confused: Any thoughts? Thank you. :)