Leitz the summicron objective 5cm camera lens info. Available to purchase for immediate download. Below is an extract from the manual converted to text for a quick impression on the content. Leitz the summicron objective 5cm camera lens infoLeitz the sectional drawing shows the first if? lElCA lens as a 6 normal symmetrical canstnietion. [I THE SUM MAR The first high-speed LEICA lens with the large aperture of it? was the 5 cm SUMMAR It was a symmetrical lens with two simsle converging elements outside. and two cemented components inside. This system was chosen because it is particularly suitable fa! achievirg high speed with a relatively large angle of view, Yhe prin- ciple ol the symmetrical type of construction afiers unusually favourable canc‘itions lor the correction at aberrations ihat apslies especially to the extensive elimination of chromatic faults- Although developed some twenty years ago, the SUMMAR is therefore still high!) valued by its owners and used with great success Antivtefleclion coating, as generally applied tc lens surfaces nowadays, will further enhance tl'e value of the SUMMAR. Symmetrical type letses especially give much more brilliant images after coatingTo meet the demands at colour photography for maximum freedom tram vignetting, the SUMMlTAR op~ pearecl as a development at the SUMMAR. The new lens featured an appreciably larger front component than was required for that aperture. noticeably increasing the “~meter of oblique light beams, ax. vi the amount at light reaching the corners of the image. This factor enabled the degree of vignetting usually found in bigbapefiure lenses to be greatly decreased. Such vigneltlng is parti- cularly disturbing in colour photo- graphy and was therefore reduced to an acceptable level in the SUMMITAR.