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Nikon Super Coolscan
4000 ED Review
The four images above were cropped out of the far right hand side of four different full resolution scans of the plastic mounted transparency represented by the photo at the top of the page. The focus point was set right on the area of the this sign. Nikon scan listed focus as '122'. I moved the manual focus slider in 5 point increments for each of the 3 following scans. You can see that the +5 point spread has nearly equal focus. At +10 points there is a noticeable loss of focus. At +15 the writing is nearly unreadable. The entire focus spread across this transparency ranged from 113 to 122 making critically sharp focus center to edge for this transparency impossible to achieve. Since the center autofocus was about 120, setting the focus point at 118 or 119 would probably be the best compromise for this transparency. Fuji Provia F ISO 100 shot with a Canon 24-85mm lens at 24mm, f8 and 1/250 sec.
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