ulf Posted January 11, 2021 Share Posted January 11, 2021 Finalized: Work in progress.Last Update:Staeble-Werk 35mm f/3.5 Staeble-Lineogon Manufacturer: Staeble-WerkManufacturer's lens designation: STABLE-LINEOGON 1:3.5 / 35Currently manufactured: NoLens type: Manual focus, Prime, Wide AngleFocal length: 35mmAperture range: f/3.5 – f/16, Manual, 10 bladesDesign: 4 elements in 4 groupsFlange Focus distance: Mount dependableRecommended magnification range: Up to 1x without reversing the lens.Optimal magnification*: ?Mount: M42 x 1.0, M39 x1.0**Sensor format/coverage: up to 24mm x 36mmFront filter: 40.5 mm x 0.75 mmIntroduction year: early 1960?S/N of test object: 737665 * Optical design is said to be identical to the Noflexar 35/3.5. See that lens in the UV Lens Data for more information, if that rumor is true.**Mount of test object Lens review (VIS), on the web: http://forum.mflense...paxette-t69839.Image of test object: Transmittance SummaryDefinitions of the parameters belowRange: The STABLE-LINEOGON 1:3.5 / 35 lens transmits 0-68% in an increasing slope from 320nm to 400nm.TVISmax (%) = 89%T400nm (%) = 68%T365nm (%) = 54%This moderate to high percentage is an indicator for reasonable exposure time under typical UV-pass filtration peaking around 365 nm.λUV HMvis(nm) = 354nmλUV HM400 (nm) = 345nmλUV 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.Spectral transmission graphs:UV-NIR, Staeble-Lineogon 35mm f/3.5 The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, Staeble-Lineogon 35mm f/3.5 UV-Log, Staeble-Lineogon 35mm f/3.5 Numerical Spectra Data available: Pending General comments about the UV-reach:This lens is as said above supposed to be similar to the Noflexar 35/3.5, however the transmission-levels are not identical for my two lenses. The UV cut-on is very similar.The difference, where the Noflexar is the better one of the two might be due to differences in the coatings.I think my Staeble-Lineogon is older and coating technology improved much in the sixties. Filters and how to use them on this lens:The front filter thread is 40.5mm standard filter thread. A step-up filter ring might be needed. 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 focussing:This lens has a focusing helicoid that smoothly turns almost a full turn for focus at infinity to around 1m. To focus closer external bellows, focusing helicoids or extension rings are needed. Flare and sun-stars: TBD Sharpness: High according to net reviews. For UV ? Lens distortion:TBD Chromatic Aberration / fringing in UV:TBDImage samples:UV:imageFilter: UV, Fringing:imageFilter: UV, Fringing 100%:imageFilter: VIS+NIR:imageFilter: NIR:imageFilter: long pass 800nm Link to comment
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