ulf Posted May 6, 2021 Share Posted May 6, 2021 Last Update: Finalized: Work in progress.Steinheil München 135mm f/4.5 Cassarit Manufacturer: Steinheil MünchenManufacturer's lens designation on the front ring: Steinheil-Cassarit 4.5/135mm <serial number>Currently manufactured: NoLens type: Manual focus, Prime, Short TelephotoDesign: 3 elements in 3 groupsFocal length: 135mmAperture range: f/4.5 – f/32, Preset Manual, 15 bladesFocus Range: 1.5m to infinitySensor format/coverage: 24 mm x 36 mmMount: M42 x 1 thread**, others.Helicoid: Yes, in the front part of the lensIt is possible to separate the front part from the rear tube part by a m39 x 1 thread and mount it on a suitable bellows or extension tube.Flange Focus distance: M42/45.46 mmFront filter: 49 mm x 0.75 mmIntroduction year: around 1967This lens produced: tbdS/N of test object: 2294118** Mount of test objectImage of test object: Transmittance SummaryDefinitions of the parameters belowRange: This Steinheil-Cassarit 4.5/135mm transmits from 1-90% in an increasing slope from 317nm to 400nm.TVISmax (%) = 93%T400nm (%) = 90%T365nm (%) = 76%This high percentage is an indicator for relatively short exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination.λUV HMvis(nm) = 345nmλUV HM400(nm) = 344nmλUV Zero(nm) = 317nmThese three values indicate that the lens is working for shorter wavelength UV-A photography with some filters and the few for this, suitable cameras.Spectral Transmission GraphsUV-NIR, Steinheil-Cassarit 4.5/135mmThe transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, Steinheil-Cassarit 4.5/135mm UV-Log, Steinheil-Cassarit 4.5/135mmNumerical Spectra Data available: Pending Filters and how to use them on this lens:The front filter thread is a 49mm standard filter thread. Handling and focussing:TBD Flare and sun-stars: TBD Sharpness: TBD Lens distortion:TBD Chromatic Aberration in UV:TBD Link to comment
rfcurry Posted May 9, 2021 Share Posted May 9, 2021 Great work, Ulf! Thank you for the valuable insights. Link to comment
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