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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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crossposted - was Invar low expansion metal
"Ed Majden" wrote in message ... Does anyone know where I can get a small sample/order for low expansion Invar metal? I want to try and make a 2-1/4 inch cut film holder for a Celestron 8 inch Schmidt Camera. For folks familiar with the Celestron Schmidt and their 35 mm single frame film holder I want to make a larger version to accept 2-1/4 round disks of film cut from sheet film. This will give me a larger field of view, around 10 degrees. To control vignetting at the edge of the field the 8 inch will be stopped down to 6 inches. Vehrenburg in Germany did this with holders he sold. Unfortunately I have been unable to find one for sale at reasonable cost. Some seem to think that these are now collectors items and worth a small fortune! :-( Thanks: Ed Majden B.C. - Fireball Network Coordinator - AMS Meteor Spectroscopy West Coast Sandia Bolide Detection Station Courtenay B.C. CANADA http://members.shaw.ca/epmajden/index.htm |
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