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Thanks Roland - That's very helpful. I have done
similar tests with my 4x5 to see where the field of view starts and stops.
Looking at the lens and seeing the ground glass image through it is a great way
to get people into group shots without telling them to move left and right and
trying to guess who is on and out of the frame. I just shout at them to make
sure they can see white in the lens - works everytime.
FYI - I met your friend Dr Dave at the
WSP with his/your 7" f7 Starfire. I was in the presence of greatness.
Oh yeah and Dave was a top guy too.
I don't know if you saw the pictures I posted of
the set-up.
I'll try to the test you outlined this
weekend.
Regards Monte
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 |
