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Forum: Pentax SLR Lens Discussion 01-07-2014, 10:09 AM  
DA 20-40mm Limited review posted
Posted By fuent104
Replies: 80
Views: 12,948
Depth of focus (sortof the inverse) of depth of field is more shallow with wide lenses, which means a more perfect distance between the lens and the sensor is needed. This is on of the factors that is monitored in cinema cameras when doing maintenance because even the nicest wide lens can look soft if that distance is not correct.
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