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Photo Forum / Film Photography / 35 mm / August 2007design of fujinon 55mm f/2.2 lens
Hi All, I am curious to know about the design of fujinon 55mm f/2.2 lens. It is listed as 4 element in 4 groups. So, it does not make it a Tessar type lens, tessars usually being no faster than 2.8. It is not also a double Guass design. Fuji has another 55mm lens which is of traditional design, 55mm f/1.8. Could anyone provide more information about this lens? Is it expected to perform as well as a 6 element lens, and did any other manufacturer produce similar lenses? thanks for any information, Sreenath > Hi All, > [quoted text clipped - 13 lines] > thanks for any information, > Sreenath I can't really help, but I did once own a Fujinon 55mm 1.6 (on a Fujica ST605, then an AZ-1). Very fine lens although a little prone to flare - I recall it had an unusually curved front element. Fuji seem to do their own thing quite frequently... > Hi All, > > I am curious to know about the design of fujinon 55mm f/2.2 lens. It > is listed as 4 element in 4 groups. > So, it does not make it a Tessar type lens, tessars usually being no > faster than 2.8. Sorry to say, the Tessar design consisted of 4 elements in 3 groups. The front two were separate, and the back two were cemented. Once upon a time, the max speed (with very good sharpness) of the Tessar design was considered to be f3.5. Some companies have sold f2.8 Tessars, but these were not the best around. Again, once upon a time, the conventional wisdom was the 5 elements provided the required number of degrees of freedom for good performance at f2.8. I suppose I should mention the Zeiss Triotor f3.5 lens (I have an old Rolleicord with one), but these definitely were not as sharp as the Tessars. Triotars are cheaper though. Perhaps someone wiho owns one of the subject lenses can comment about its performance. > It is not also a double Guass design. Not symmetrical? > Fuji has another 55mm lens which is of traditional design, 55mm f/1.8. > > Could anyone provide more information about this lens? Is it expected > to perform as well as a 6 element lens, and did any other manufacturer > produce similar lenses? I would be surprised if it does; however, computer aided design of lenses in conjunction with aspheric lenses can work wonders. > thanks for any information, > Sreenath Jim "sreenath" <sreenathbh@rocketmail.com> wrote in message > I am curious to know about the design of fujinon 55mm f/2.2 lens. It > is listed as 4 element in 4 groups. It is probably a symmetric [or close to] lens with 4 meniscus elements arraigned around a central stop. Sometimes called a '4-element Gauss' [and closer to what Gauss originally proposed than the 6-elements that go by that name]. The design shows up in the Petzval portrait lens, some slide projector lenses and in process lenses. Basic principle is used in wide-angle view camera lenses like the wide-field Ektars. In this application it would be as a budget lens with a bit better aperture specification than a Tessar. Should be very low distortion.  SignatureNicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index.htm n o lindan at ix dot netcom dot com > "sreenath" <sreenathbh@rocketmail.com> wrote in message >> I am curious to know about the design of fujinon 55mm f/2.2 lens. It [quoted text clipped - 14 lines] > In this application it would be as a budget lens with a bit better > aperture specification than a Tessar. Should be very low distortion. To add: Zeiss manufactured a very wide angle lens for the Leica which was designed as Nicholas described. Examples of this lens are quite scarce and very expensive. It is also said to be very sharp and remarkably free from distortions. Nikon also used such a symmetrical design for the 25mm f4 lens for use on their rangefinder cameras. These lenses are also very scarce and expensive. The lens was introduced in 1954. Nikon did not remount this lens for the SLR cameras. It was supposed to have been quite sharp and lacking in distortions. However, it does not necessarily follow that the Fujinon lens will possess the traits of these two predecessors. Jim > "sreenath" <sreenathbh@rocketmail.com> wrote in message >> I am curious to know about the design of fujinon 55mm f/2.2 lens. It [quoted text clipped - 7 lines] > > The design shows up in the Petzval portrait lens, No. The Petzval lens is nonsymmetric in the extreme. It has two widely spaced positive two element groups, each of which is semi-achromatic. Doug McDonald > Nicholas O. Lindan wrote: >> Sometimes called a '4-element Gauss' ... >> The design shows up in the Petzval portrait lens, > No. The Petzval lens is nonsymmetric in the extreme. It has two > widely spaced positive two element groups, each of which is > semi-achromatic. You're right ... one group is cemented(?) SignatureNicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index.htm n o lindan at ix dot netcom dot com |
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