ulf Posted February 13, 2021 Share Posted February 13, 2021 Finalized: Work in progress.Last Update:Note: Additional information or links about this lens are welcomed and will be incorporated into the first post as time permits. Nikon 135mm f/5.6 EL-Nikkor: old metal version Manufacturer: NikonManufacturer's lens designation: EL-NIKKOR 135mm f/5.6Currently manufactured: No Lens type: Enlarger lens for film up to 4" x 5" ( Ø160mm )Design: 6 elements in 4 groupsFocal length: 135mmAperture range: f/5.6 – f/45, Manual, 8 blades Format coverage: up to 4" x 5" ( Ø160mm ) at 0.2 x magnificationRecommended magnification range*: 0.1x – 0.5x.Optimal magnification*: 0.2x*Definitions reversed from normal enlarger definition, referring to the motif not the negative-plane Mount: M39 x 26tpi threadReverse mount: M6 x 0.5 thread, hidden under a cover ring outside the filter thread.Helicoid: NoFlange focus distance: 90 mmFront filter: 43 mm x 0.5 mm Introduction year: pre 1960?S/N of test object: 429624 Lens review (VIS), on the web:Lens Manual on the web: http://www.savazzi.n...El-Nikkor_2.pdfTransmittance SummaryDefinitions of the parameters belowRange: The EL-Nikkor 135mm f/5.6: old metal version lens transmits 0-81% in an increasing slope from 320nm to 400nm.TVISmax (%) = 84%T400nm (%) = 81%T365nm (%) = 65%This high percentage is an indicator for relatively acceptable exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination.λUV HMvis(nm) = 350nmλUV HM400 (nm) = 348nmλUV Zero (nm) = 320nmThese three values indicate that the lens is working even for some limited upper UV-B photography with some filters and a few for this, suitable cameras.Image of test object: Spectral Transmission GraphsUV-NIR, EL-NIKKOR 135mm f/5.6, 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 135mm f/5.6, old metal version UV-Log, EL-NIKKOR 135mm f/5.6, old metal versionNumerical Spectra Data available: Yes General comments about the UV-reach:tbaFilters and how to use them on this lens:The front filter thread is rather odd, but suitable adapter can be found at RafCamera:https://www.ebay.com...amera?_bkw=34.5 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.Handling and focussing:This EL-Nikkor 135/5.6 must be used with a helicoid or macro bellows to set desired magnification. The lens's long FFD easily permits focus to infinity with careful sizing of the helicoid or bellows. Flare and sun-stars: TBD Sharpness: TBD Lens distortion:TBD Chromatic Aberration / fringing in UV:TBDImage samples:UV:imageFilter: UV, Fringing:imageFilter: UV, Fringing 100%:imageFilter: VIS+NIR:imageFilter: NIR:imageFilter: Link to comment
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