Archived posting to the Leica Users Group, 1999/06/29
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]snip >If your 40 Focotar is not sharp on the edges at f5.6, something is wrong >with it. > snip >My advice is to check the performance of your 40 Focotar at f5.6 and f8. If >the edge performance is poor at these apertures, your lens is defective, and >should be repaired by a competent party, namely Leica. I had a sharpness problem with my 40 Focotar which was due to paint particles coming off the aperture blades and sticking on to one of the inner lens surfaces. The particles could be clearly seen when placing the Focotar on a light box and looking into it with the help of a loupe (as it is otherwise difficult to focus your eyes on an inner lens surface). I had bought the lens used and it had obviously been out of action for a long time and I guess the aperture blades had got stuck together. The lens was sharp when I first used it, but then deteriorated quickly. I had it cleaned by Leica, and it is now second to none. - -- christer almqvist eichenstrasse 57, d-20255 hamburg, fon +49-40-407111 fax +49-40-4908440 14 rue de la hauteur, f-50590 regnéville-sur-mer, fon+fax +33-233 45 35 58