1) The Rollei TLR cameras bodies don't use simple aluminum, they use
die cast aluminum. Aluminum is cast at a temperature of 650 ºC (1200
ºF). It is alloyed with Silicon and Copper, Silicon increases the
melt fluidity, reduces machinability, Copper increases hardness and
reduces the ductility, these materials proportions can vary according
the aluminum use.
Rollei TLR bodies are very resistant from any point of view, I have
verified it along decades. Alumetall from Nürnberg was the F&H
aluminum provider
2) The Nikon FM2/n has a long-standing reputation for reliability and
durability and it was a photojournalists favorite for this reason. It
has an extremely strong body of copper silumin alloy. The FM2's film
transport consists of high-strength hardened metal gears and moving
parts, mounted on clusters of ball bearings. The vertical metal
shutter, originally titanium and switching to aluminum during the FM2n
life cycle, utilizes precision tapered high-strength blades and
oil-less self-lubricating bearings. The mirror linkage uses the same
mechanism found on Nikon's professional F2, with some modern
improvements designed to further reduce effects of vibration and
mirror bounce. The camera features Nikon's famous close tolerance
assembly and minimal space lubrication, meaning that it will reliably
operate in temperature extremes of -40 °C to +50 °C.
Carlos
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