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The tables below show the image widths for a given lens at various distances from the front of the lens.

Patt 252 / Cadenza Effects Projector

Lens Focal Length (inches)
    2.5" 3" 4" 5.5" 6" 8" 10"
Feet from lens 6 ft 12'0" 9'3" 5'9" 4'0" 3'4" 2'4" 2'1"
8 ft 16'0" 12'4" 7'8" 5'4" 4'6" 3'2" 2'10"
10 ft 20'0" 15'5" 9'7" 6'8" 5'7" 3'0" 3'6"
12 ft 24'0" 18'6" 11'6" 8'1" 6'9" 4'9" 4'3"
15 ft 30'0" 23'0" 14'4" 10'1" 8'5" 5'11" 5'4"
20 ft 40'0" 30'0" 19'2" 13'5" 11'3" 7'11" 7'1"
25 ft 50'0" 38'5" 23'1" 16'9" 14'1" 9'11" 8'10"
30 ft 60'0" 46'0" 28'8" 20'2" 16'10" 11'10" 10'8"
Picture Width

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35mm Projector

Lens Focal Length (mm)
    35mm 60mm 70mm 120mm 150mm 180mm 250mm
Feet from lens 4 ft 4'0" 2'4" 2'0"        
6 ft 6'0" 3'6" 3'0"        
8 ft 8'0" 4'8" 4'0" 2'4"      
10 ft 10'0" 5'10" 5'0" 2'11" 2'3"    
15 ft   8'9" 7'6" 4'5" 3'6" 2'10"  
20 ft   11'8" 10'0" 5'11" 4'7" 3'9" 2'8"
30 ft   17'6" 15'0" 8'11" 7'0" 5'8" 4'1"
40 ft   23'4" 20'0" 11'10" 9'4" 7'7" 5'7"
50 ft     25'0" 14'10" 11'8" 9'6" 7'0"
60 ft     30'0" 17'10" 14'1" 11'5" 8'5"

Picture Width

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