Re: Fw: [APML] Tak FSQ-106

[Chris1011@aol.com]

In a message dated 5/2/2002 8:22:07 PM Central Daylight Time, montezinho@bigpond.com writes:


> Yes - Both 35 and 120. My comment before relates to wanting to know if there is gross drop off like a stop or more or is it subtle?


Find out for yourself by opening the back of the 6x7 camera and looking with your eyeball at the edge of the format through the aperture and look to see how much of the front lens you see. Use a ruler across the front lens and see what diameter you can see with your eyeball at the corners, sides, top and bottom, and finally the middle of the format. Better yet, place a piece of paper over the 6x7 camera film plane, punch small 1/8 inch holes in these 4 different places, and look through them with your eyeball (shutter open of course). See where the light is cut off for the various points of the format. 

This is quite similar to ray tracing and will tell you everything you ever wanted to know about your optical system, and then some. You will be smarter than 99.9% of the amateurs out there (and can then get yourself into heated controversial discussions too).

Roland Christen