![]() However cheaper lenses using the old Cooke triplet formulation were often sold as a more reasonably priced alternative to the Tessar-type lenses. As a result the Tessar was largely dropped in favour of the better corrected six element designs based on the Gauss Plasmat. At this point coatings became widespread and the number of elements could be increased. This 4 element design became standard for good quality lenses right up to the 1950's. However the more elements you use the more corrections can be applied to create a better image.Īlmost immediately the Cooke triplet appeared it was improved by adding a fourth element to create what became the classic Zeiss Tessar design. The fewer elements (or more strictly air-to-glass surfaces) used in a lens the better the light transmission and the higher the contast. The 1893 Cooke triplet was a breakthrough in lens design especially in the days when coatings were still to be invented. I would have thought most 100mm f2.8 lenses would give you much the same out of focus effects but I suupose it is possible that the inherent imaging problems of the original three element f2.8 Trioplan gave rise to an accentuation of the 'soap bubble' bokeh not found in better corrected lenses. So, maybe, shoot at f2.8 in strong sunlight at flowers with lots of water droplets on them and I reckon you will achieve the result you are looking for. I think it is unlikely you will be able to find a suitable replacement and you probably don't need it. If your Trioplan has a 10 blade diaphragm then I suggest you try it as it is. I imagine the interesting bokeh was a result of the fast aperture creating lots of out of focus areas together with the shape of the diaphragms of these old shutters. The original Meyer Trioplan lenses could be fitted to a number of shutter / diaphragm combinations. This recent lens (2015) although named Trioplan is a different animal from the Meyer of old, being a 6 element 100mm f2.8 lens with a diaphragm designed to produce the 'soap bubble effect'. More recently there has been a revival of the Trioplan name using the 'soap bubble lens' as a selling point. Most manufacturers about this time made triplet lenses for their cheaper options models - for example the Zeiss Novar. The faster aperture Trioplan variants had a reputation for softness as they probably pushed the triplet layout beyond its optimum.So they were medium quality lenses which gave quite good results based on the earlier Cooke triplet layout. I had one on a 1930's 6x9 folding plate camera. Originally they were used in cine applications but later stiil camera usage took over. They made them in many focal lengths and apertures and for many film formats from about 1914 to about 1960. Meyer Gorlitz made many three element lenses named Trioplan based on the Cooke triplet of 1893. ![]()
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