ulf Posted February 18, 2021 Share Posted February 18, 2021 Finalized: Work in progress.Last Update: Nikon 50mm f/2.8 EL-Nikkor:. old metal version Manufacturer: NikonManufacturer's lens designation: EL-NIKKOR 50mm f/2.8Currently manufactured: NoLens type: Enlarger lens for film up to 24mm x 36mm ( Ø43.2mm )Focal length: 50mmAperture range: f/2.8 – f/45, Manual, 8 bladesDesign: 6 elements in 4 groupsFlange Focus distance: 44.8mmRecommended magnification range*: 0.05x – 0.5x.Optimal magnification *: 0.125xMount: M39 x 26tpi thread.Sensor format/coverage: up to 24mm x 36mmFront filter: 40.5 mm x 0.5 mmIntroduction year: pre 1960?S/N of test object: 343805* Definitions reversed from normal enlarger definition, referring to the motif not the negative-plane Lens review (VIS), on the web:Lens Manual on the web: http://www.savazzi.n...El-Nikkor_2.pdf Image of test object: Transmittance SummaryDefinitions of the parameters belowRange: The El-Nikkor 50/2.8 Old Metal lens transmits 0-80% in an increasing slope from 332 nm to 400nm.TVISmax(%) = 84%T400nm(%) = 80%T365nm(%) = 56%This percentage is an indicator for moderately short exposure time under typical UV-pass filtration peaking around 360 nm.λUV HMvis(nm) = 357nmλUV HM400(nm) = 356nmλUV Zero(nm) = 332nmThese three values indicate that the lens is primarily UV-capable in the UV-A range using UV-pass filtration peaking around 365 nm or higher.Spectral transmission graphs:UV-NIR, EL-NIKKOR 50mm f/2.8, old metal versionThe transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, EL-NIKKOR 50mm f/2.8, old metal version UV-Log, EL-NIKKOR 50mm f/2.8, old metal versionFilters and how to use them on this lens:The front filter thread is common and can be adapted to other filter sizes buy a simple step ring. It is also possible to use rear mounted filters, either in lens mount adapters for mirrorless cameras like Sony A-series etc, or placed directly in the camera. An alternative, if space in the camera allows, is to putty-mount a filter directly against the lenses rear element mount ring.The rear lens element is recessed and thus safe and the ring provides a good reference plane for orienting the filter normal to the optic axis. My Omega 330W80 Improved Ø25mm, is mounted in a 27mm-filter ring and works well to mount as it is. Handling and focusing:This lens needs to be combined with a helicoid or macro bellows to set desired magnification.With short enough minimum length of a short helicoid it is easy to obtain focus at infinity with mirrorless cameras.However the standard adapters for M42-lenses to mirrorless cameras will not give focus at infinity.However these lenses are designed and optimised for short focus distances. At infinity the result will not be optimal. Link to comment
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