I am trying to ascertain the correct focal distance for an elliptcal dish with the following measurements.
Wide 900mm Height 670mm Depth 105mm.My present FD is 490mm, but i am unable to calculate the FD due to not having a formula.Can a member please do a calculation and advise the formula to be used.
Wide 900mm Height 670mm Depth 105mm.My present FD is 490mm, but i am unable to calculate the FD due to not having a formula.Can a member please do a calculation and advise the formula to be used.