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 --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list