Nikon 200 mm f/4 Manual-Focus Micro-Nikkor

The extension available is 47.5 mm, and the focal length at the close focus point is 76.2 mm.

Corrected focal length = Fc

Magnification Subject distance Correcting Lens Extension tube    
Near focus Far focus Near focus   Far focus   Focal Length diopters      
                       
0.50 0.00 19.57 in Inf   None   0.00 0    
0.66 0.14 16.28 in 65.14 in None mm 0.00 27.5 mm PK-13, M-ring
0.82 0.26 14.47 in 37.87 in None mm 0.00 52.5 mm PN-11
0.83 0.28 14.32 in 36.51 in None mm 0.00 55 mm 2 PK-13s
0.98 0.40 13.11 in 27.56 in None mm 0.00 80 mm PK-13 + PN-11
                       
0.95 0.30 10.28 in 26.25 in Nikon 3T   1.50      
1.37 0.58 7.12 in 13.58 in Nikon 4T   2.90      
                       
1.16 0.48 9.29 in 18.71 in Nikon 3T   1.50 27.5 mm PK-13, M-ring
1.63 0.80 6.64 in 11.23 in Nikon 4T   2.90 27.5 mm PK-13, M-ring
                       
1.36 0.64 8.67 in 15.50 in Nikon 3T   1.50 52.5 mm PN-11
1.87 0.99 6.31 in 9.99 in Nikon 4T   2.90 52.5 mm PN-11
                       
1.58 0.82 8.17 in 13.44 in Nikon 3T   1.50 80 mm PK-13 + PN-11
2.13 1.21 6.04 in 9.10 in Nikon 4T   2.90 80 mm PK-13 + PN-11


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Jim Kasson