Using AFX method.
begin lens
group: pentaxSLR
multiplier: 1.5
aperture: 2.8
menu_lens: smc PENTAX-DA* 50-135mm f/2.8 ED [IF] SDM
cal_abc: 50.0 -0.0016070 -0.0043298 -0.0006704
cal_abc: 63.0 -0.0114310 0.0277038 -0.0258325
cal_abc: 75.0 -0.0124547 0.0427772 -0.0459187
cal_abc: 95.0 -0.0011140 0.0090157 -0.0092901
cal_abc: 108.0 0.0048771 -0.0116449 0.0178702
cal_abc: 135.0 0.0043682 -0.0004403 -0.0022449
end
