Leica R-Lenses
September 2003Chapter 3: 180 mm and 280 mm lenses
__ LEICA APO-ELMARIT-R 180 mm f/2.8__ LEICA APO-TELYT-R 280 mm f/4
by Erwin Puts
Страница 1: ...Leica R Lenses September 2003 Chapter 3 180 mm and 280 mm lenses __ LEICA APO ELMARIT R 180 mm f 2 8 __ LEICA APO TELYT R 280 mm f 4 by Erwin Puts...
Страница 2: ...otography when a tripod would be a hindrance in following rapid movements of the sub jects The Achilles heels with telephoto lenses are the chromatic errors and the size of the secondary spectrum or c...
Страница 3: ...f 2 8 Elmarit R lens could not outperform the 180 mm f 3 4 Apo Telyt R lens And the shortest focusing distance of 2 5 meters 8 2 feet was unre markable In addition the ergonomics were no longer state...
Страница 4: ...ple look like the paintings of people by Rembrandt We can explain this with a small experiment Let us photograph two objects of the same size that are located one meter 3 28 feet from each other at a...
Страница 5: ...quality At these distances there is a reduction of 1 8x in the luminance of the negative The automatic exposure programs of Leica R cameras compensate for this effect but when you make a manual exposu...
Страница 6: ...willing to experi ment and investigate which combination best suits your needs __ Optical considerations The basic design of a telephoto lens consists of a converging front lens with a positive focal...
Страница 7: ...near the edges of the negative The high level of correction of the current 180 mm lens can be seen in the MTF graphs The f 2 8 aperture delivers the best performance it might be improved a bit at f 4...
Страница 8: ...sper and tighter effect The 180 mm f 2 8 Apo Elmarit R lens can be focused beyond the infinity mark as the 280 mm lens can as well This is inten tional in order to accommodate heat expansion and it is...
Страница 9: ...ilm Agfa Copex and Kodak Techni cal Pan At first sight this may appear to be a bit disappointing But 150 Lp mm are 300 separate lines in one millimeter and that means that every single line has a widt...
Страница 10: ...thousandths of a millimeter Experienced wildlife photographers use everything from sandbags to bricks attached to the tripod in order to redu ce vibrations I used weights placed on the body and on the...
Страница 11: ...optical performance is superb even with high speed films the grain will be tight and compact because the small image points will not cause flare or halo in the grain pattern Hand held pictures will p...
