ulf Posted March 27, 2021 Share Posted March 27, 2021 Last Update: 03 April 2021 agb/label/title Finalized: Work in progress. Kyoei 135mm f/3.5 Acall Manufacturer: Kyoei Optical Co. Ltd. Manufacturer's lens designation: Kyoei Optical Co. Ltd. Acall 135mm 1:3.5 No.<serial number> Currently manufactured: No Lens type: Manual focus, Prime, Short Tele Lens Design: TBD Focal length: 135mm Aperture range: f/3.5 – f/22, Preset Manual, 12 blades Focus Range: 4.5 feet to infinity Sensor format/coverage: up to 24 mm x 36 mm Mount: M42 x 1 thread Helicoid: Yes Flange Focus distance: M42/45.46 mm, Front filter: 46 mm x 0.75 mm Introduction year: between 1965 and 1970??? S/N of test object: 80050 Image of test object: Transmittance Summary Definitions of the parameters below Range: This Soligor 1:3,5 f=135mm transmits from 1-80% in an increasing slope from 330nm to 400nm. TVISmax (%) = 90% T400nm (%) = 86% T365nm (%) = 66% 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) = 352nm λUV HM400(nm) = 351nm λUV Zero(nm) = 330nm These three values indicate that the lens is marginally working even for some shorter wavelength UV-A photography with some filters and the few for this, suitable cameras. Spectral Transmission Graphs UV-NIR, Kyoei 135mm f/3.5 The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, Kyoei 135mm f/3.5 UV-Log, Kyoei 135mm f/3.5 Numerical Spectra Data available: Pending General comments about the UV-reach: tba Filters and how to use them on this lens: The front filter thread is a 46mm 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. Handling and focussing: TBD Flare and sun-stars: TBD Sharpness: TBD Lens distortion: TBD Chromatic Aberration in UV: TBD. Link to comment
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now