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[ LarScan FAQs ] [ LarScan Help ] [ LarScan Lens? ] [ LarScan Book ]
Frequently Asked LarScan Questions
What focal length lens should I use? What size
negative do you want? A 20mm lens will give you a 360 DOV that is 4.9 inches long and will
fit in a 4x5 enlarger. A 24mm lens will give you a 5.9 inch long 360DOV that can also fit
in many 4x5 enlargers. A 28mm will be 6.9 inches, a 35mm will be 8.7 inches, and a 50 mm
lens will give you a 12.4 inch long 360 degree field of view panorama. The choice is
yours. I recomend using zoom lenses because they allow for ajustments to be made after
construction is finished. For a list
of focal lengths and the length of the images that they give click here.
What is the distance from the film to the lens flange? This varies from camera
brand to brand. (note: Don't make the same mistake that I did. Be sure to make the
measurement with film in the body.)
Nikon = 46 .5mm
Minolta= 43mm
Olympus OM= 46mm
Konica=40.5mm
Take these values as a starting point. Confirm them by doing your own measurements.
Please measure other brands. Send values and corrections to bob@panoramic.net
How do you determine what the exposure time is? The formula is... The size of the
slit in mm, times the time the camera takes to make a 360 degree turn. Divide this number
by 2 times the focal length of the lens in mm times 3.14. The answer will be in the form
of a fraction and is the exposure time.
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LarScan FAQs
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