ulf Posted April 13, 2021 Share Posted April 13, 2021 Last Update: 03 April 2021Finalized: Work in progress.Novoflex 600mm f/8 Noflexar Manufacturer: Novoflex. The achromat was computed and produced by Staeble Optik in Schongau.Lens Label: ( NOVOFLEX ) NOFLEXAR 1:8 f=600mm <serial number>Currently manufactured: NoLens type: Manual focus, Extreme tele lens, true long focal designDesign: Achromat, 2 elements in 1 groupFocal length: 600 mmAperture range: f/8 – f/32, Manual, 24 bladesSensor format/coverage: up to 24 mm x 36 mmMount*: via a focussing bellows, BAL-U, with a suitable lens mount adapter part.Helicoid: No, Focussing with a bellow at the rear of the lens combined with the fast focus grip if used with the Schnellschuss system.Flange Focus distance: M42/45.46 mm,Front filter: 77 mm x 0.75 mm (possibly there are lenses with a 75 mm x 0.75 mm thread too, as both has been seen for the 400 mm lens)Introduction year: ca mid 1960S/N of test object: 66228 * There are mount adapters for many different camera types.Alternatively:There are rigid spacer tubes instead of the bellows, also for different cameras.However they give a very bad minimum focus distance. A document showing different configurations and options for Novoflex lenses present when the document was written:https://www.pacificr...00070/00070.pdfThere are more modern adapters for bellows and Schnellschuss-lenses, than listed in the document, including the CANA-AF for Canon EOSImage of test object:The long lens head in the center of the bottom row, marked "f = 600 mm": As you can see from the lower lens here, the whole contraption gets very long at a close up setting:More information about these lenses can be found here:https://www.ultravio...dpost__p__25241Versions compatibility:The Lens-heads of this generation share the mounting thread dimension and are interchangeable between the older Type-B and next generation Type-C, of Schnellschuss-lenses.The last generation, the Type-D of Schnellschuss-lenses have a special new type of bayonet mount for the lens heads.Transmittance SummaryDefinitions of the parameters belowRange: The NOFLEXAR 1:8 f=600mm transmits 1-92% in an increasing slope from 317nm to 400nm.TVISmax (%) = 96%T400nm (%) = 92%T365nm (%) = 87%This high percentage is an indicator for quite short exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination.λUV HMvis(nm) = 336nmλUV HM400(nm) = 335nmλUV Zero(nm) = 317nmThese three values indicate that the lens is working even for some upper UV-B photography with some filters and a few for this, suitable cameras.Spectral Transmission GraphsUV-NIR, Novoflex NOFLEXAR 1:8 f=600mmThe transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, Novoflex NOFLEXAR 1:8 f=600mm UV-Log, Novoflex NOFLEXAR 1:8 f=600mmNumerical Spectra Data available: YesFilters and how to use them on this lens:The front filter thread is an unusual 75 mm standard filter thread. 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, is to putty-mount a filter directly inside the lens. There are several flat surfaces that likely would work to mount a filter or a step ring fitting the filter.Handling and focussing:Difficult due to the long focal length.A stable tripod, or two, are needed to support the lens. Flare and sun-stars: TBD Sharpness: High for the age of the lens. Lens distortion:TBD Chromatic Aberration in UV:Yes, both axial and lateral. Improves by stopping down and can often be tolerable. Link to comment
Fandyus Posted June 13, 2021 Share Posted June 13, 2021 UV birding: now possible Low-key joking but I wonder how possible would it actually be with this lens. Link to comment
Andy Perrin Posted June 13, 2021 Share Posted June 13, 2021 Only if the bird holds perfectly still and poses for you! Link to comment
OlDoinyo Posted June 14, 2021 Share Posted June 14, 2021 My 600 has a 77mm thread. The 400 does have the 75mm thread. Link to comment
ulf Posted June 15, 2021 Author Share Posted June 15, 2021 My 600 has a 77mm thread. The 400 does have the 75mm thread. Interesting. I have to reverify the 75mm thread on all my tele Noflexar lens heads.I think all mine are 75mm, as they all allow usage of the metal lens hood.I have never used my Noflexar tele lenses with front mounted filters, as I made it possible to use internal or rear mounted filters. Link to comment
ulf Posted June 16, 2021 Author Share Posted June 16, 2021 Interesting. I have to reverify the 75mm thread on all my tele Noflexar lens heads.I think all mine are 75mm, as they all allow usage of the metal lens hood.I have never used my Noflexar tele lenses with front mounted filters, as I made it possible to use internal or rear mounted filters.I was partly wrong!Both of my old 600mm and 400mm Noflexars have a 77mm thread.The exception is my slightly younger 400mm T-Noflexar and the really old 40cm FERNOBJEKTIV have a 75mm thread.It seams like Novoflex has changed the front thread back and forth between 75mm and 77mm over the years. I will update the info for the different lenses accordingly Link to comment
ulf Posted June 16, 2021 Author Share Posted June 16, 2021 Updated the top document with pictures. Link to comment
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