Near Focus HFD Setting

Near Focus HFD Setting

1.To determine the best setting for Near Focus HFD (see Preferences / Setup )

Generate a Vcurve

Examine the Vcurve graph and identify the circle which begins to deviate from a straight line.

Determine the position in the Log by counting up the number of circles from the minimum HFD value (9.7 HFD below).

Round up the HFD value in the Log (9.7 becomes 10)

Add 2 - 3 HFD units to assure that the Near Focus Position is on the linear portion of the 'V' (13 in the example below).

2.Enter the value (13 HFD ) in the Near Focus HFD box