Hello I just recenty bought opemus III enlarger and it light's more from the center than from the edge of the picture. Could someone give some advice how to fix it. Here is the technical info of the enlarger: Meopta 0pemus III Enlarging apparatus for enlarging from negatives 6x6 cm and smaller. Lens: Belar 4.5/75. Condenser: two-lens of 105 mm diameter. Lamp: opal 100 W. Enlargement: max. 6.7x onto base plate. Weight: 7.9 kg. Years of production: 1969-75. Picture Could it be caused by that there seems to be a 50 mm belar lens instead of the 75mm listed above or could the lamp be wrong kind. I put a picture of the lamp to attachment. Sorry about bad english.