SPEED OF LIGHT

PENTAX K-3, PENTAX K-30,PENTAX K-5, PENTAX K 20D,Pentax FA*250-600 5.6, Pentax DA*200 2.8, Pentax A 50 1.7, Pentax 10-17 3.5-4.5 Fish Eye, Pentax A 100 4 Macro, Pentax FA 77 1.8 Limited,Pentax DA*50-135 2.8,Pentax FA*400 5.6,Sigma 30 1.4,Sigma 10-20 4-5.6, Sigma 18-50 2.8 DC EX, Helios 40 1.5, Tair-3s 300 4.5, Mir-10A 3.528, Mir-20N 3.5/20, tc Sigma 2x EX DG, Flash Sigma EF-530 DG ST

PPG: https://pentaxphotogallery.com/artists/davidtrout