ulf Posted April 2, 2021 Share Posted April 2, 2021 Last Update: 03 April 2021 agb/labelFinalized: Work in progress.Kuribayashi 105mm f/3.5 K.C. Petri Orrikkor Manufacturer: Kyoei KogakuLens front ring label: Kuribayashi K.C. Petri Orrikkor 1:3.5 f=105mm No.<serial number>Introduction year: 1959Currently manufactured: No Lens type: manual focus, prime, short telephotoDesign: 3 elements in 3 groupsFocal length: 105mmAperture range: f/3.5 – f/22, 16 blades, manual presetMagnification range: tbd. Closest focus 1.2m.Sensor format/coverage: up to 24 mm x 36 mm Mount: M42 x 1Flange Focus distance: M42: 45.46 mmFront filter: 46 mm x 0.75 mm S/N of test object: 35888 https://w.atwiki.jp/...i/pages/75.html Image of test object: Transmittance SummaryDefinitions of the parameters belowRange: The Kuribayashi 105mm f/3.5 K.C. Petri Orrikkor - lens transmits 1-89% in an increasing slope from 330nm to 400nm.TVISmax (%) = 90%T400nm (%) = 89%T365nm (%) = 75%λUV HMvis(nm) = 346 nmλUV HM400(nm) = 345 nmλUV Zero(nm) = 318 nmThese three values indicate that the lens is working for UV-A and some UV-B photography.The rather high transmission at 365nm gives comparably short exposure times for a typical UV-pass filter-stack or a Baader U.Spectral Transmission GraphsUV-NIR, Kuribayashi 105mm f/3.5 K.C. Petri OrrikkorThe transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, Kuribayashi 105mm f/3.5 K.C. Petri Orrikkor UV-Log, Kuribayashi 105mm f/3.5 K.C. Petri Orrikkor General comments about the UV-reach:The lens do reach quite deep into UV for a 105mm lens.This reach will be enough for most UV-photography, with sun or UV-converted flash as light source, together with a typical UV-pass filter-stack or a Baader U. Filters and how to use them on this lens:The front filter thread is 46mm standard filter thread. It is also possible to use rear mounted filters, in lens mount adapters, or placed directly in the camera.Handling and focussing:Due to the long 45.46mm flange focus distance this lens will be possible to mount with lens mount adapters and focus at infinity with most DSLRs. Sharpness: TBD Lens distortion:TBD Chromatic Aberration in UV:TBDImage samples: Link to comment
Stefano Posted April 7, 2021 Share Posted April 7, 2021 I was randomly reading this topic, and just noticed that the λUV Zero value is off. Link to comment
Andrea B. Posted April 8, 2021 Share Posted April 8, 2021 Stefano, thank you. We will fix that.Looks like another statement is not quite right: "this lens is working only for UVA photography".Also mention of the Petri 135 mm lens. Looks like a cut & paste error. Link to comment
ulf Posted April 8, 2021 Author Share Posted April 8, 2021 Stefano, thank you. We will fix that.Looks like another statement is not quite right: "this lens is working only for UVA photography".Also mention of the Petri 135 mm lens. Looks like a cut & paste error.Fixed. I am sure that there are more of them lurking in some of the other lens topics.Please let me know when you find the next error. Most of them are cut & paste errors, as I am using old topics to clone from, when writing new ones.Then I edit the clones to fit the new test object. Sometimes I miss changing some details like in this post. I am also slightly dyslectic and cannot see my typos.Then it is very valuable with help from sharp eyes and brains from others. Than you both for proofreading my posts and finding errors. Link to comment
Avalon Posted January 14 Share Posted January 14 Could PETRI CC AUTO 2,8/135 KURIBAYASHI be using same glass? Link to comment
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