andreas_carl Posted July 13, 2004 Share Posted July 13, 2004 With what model did the lens formulation (chemical composition) of the 38mm biogon lens change? Thanks! Link to comment Share on other sites More sharing options...
j._mose Posted July 13, 2004 Share Posted July 13, 2004 905 SWC Link to comment Share on other sites More sharing options...
butch_welch Posted July 13, 2004 Share Posted July 13, 2004 It was changed in 1986 (SWC with CF lens) to use new glass types and more radically changed in 2001 (905SWC with CFi lens) to eliminate arsenic and lead in the glass . Link to comment Share on other sites More sharing options...
j._mose Posted July 13, 2004 Share Posted July 13, 2004 In addition to the glass change in 1986, which Butch has noted in the prior response, Schott glass was introduced in 1958. However, these changes were very minor in comparison to the unleaded glass change introduced with the 905SWC. Link to comment Share on other sites More sharing options...
j._mose Posted July 13, 2004 Share Posted July 13, 2004 CORRECTION: The Schott Glass was introduced in 1957. Also, T* Multicoating was introduced in 1972. Further glass changes in 1986. Unleaded glass in 2001. Link to comment Share on other sites More sharing options...
andreas_carl Posted July 13, 2004 Author Share Posted July 13, 2004 Thanks!!! Link to comment Share on other sites More sharing options...
roland_haid Posted July 14, 2004 Share Posted July 14, 2004 In the year 2000, Schott, main supplier for Carl Zeiss announced the introduction of lead and arsenic free optical glass. This reason for this was the very high and increasing costs of disposal of glass waste for both, glass manuafcturer and optical workshop. The new glass types are designed to have almost the same optical properties as their predecessors. The name of the glass type remained. For instance the heavy crown(SchwerKron)SK10 now becomes N-SK10 indicating the new glass. Some of the older types remained in the programm, not all of the new types could replace the old ones. Interestingly, Carl Zeiss and all other customer of Schott now (apparently) use the new types, but only the Biogon was redesigned. What about the Sonnar 150mm, the Planar 120, the Sonnar 250? All these lens should now include the new glass, but no redesign was announced. I do not know why the Biogon need this where as the other lens don't. Maybe someone have an answer here. Link to comment Share on other sites More sharing options...
kornelius_j._fleischer Posted July 14, 2004 Share Posted July 14, 2004 Yes, Zeiss has the answer: All lenses you see in the Zeiss range for Hasselblad today were redesigned with new glass types recently. No exception! At Zeiss, we prefer to perform such improvements and updates rather quietly.The fact that you do not hear the loud noise from Zeiss that often accompanies Asian and American business activities does not indicate that we are sleeping or otherwise inactive... Link to comment Share on other sites More sharing options...
l_a_k_h_i_n_d_e_r Posted August 27, 2004 Share Posted August 27, 2004 I happen to chance upon this thread. My question to Kornelius is: what about Zeiss lenses for Rollei? Link to comment Share on other sites More sharing options...
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