View allAll Photos Tagged selenium
Yashica Minister III ~1966
Yashinon f = 45mm, 1:2,8
Citizen shutter 1 - 1/500 and B
Coupled rangefinder
Uncoupled Selenium light meter
35mm
Here are some photos taken with this camera.
Yashica-E
Japanese Medium Format (6x6) TLR with an Auto-exposure shutter.
Exposure System. Trapped Needle, Phase 1.
Here you see that part of the exposure system which translates the electrical current coming from the Selenium Cell into the mechanical position used for the Diaphragma opening.
The electric current flowing from the Selenium Cell passes through the Lightmeter Coil.
The Lightmeter has 2 Needles, one visible through the meters windows (see 1) and one used for the exposure system (see 2).
Now, during the depression movement of the Release Button 2 Plates are moved towards the Lightmeter in de direction of the green arrow. The Bottom Plate (see 4) which has a flat front surface and the Upper Plate (see 5) which has a curved and stepped front surface (see 6).
The bottom Plate (4) reaches the Needle (2) first. Its flat front surface "traps" the Needle against an Anvil (see 3).
The arrow (see 7) shows were the Needle got trapped in this instance.
This is the first Phase.
.
.
WARNING :
This image is intended as a guide for the more experienced camera service man. If you have no experience in camera repair please do yourself a favor and send your camera to a professional service shop. It would be a pity to lose a vintage camera in a failed repair attempt.
We recently found a Rollei 35 LED so I thought it would be interesting to photograph all of our Rollei 35 cameras side by side so you could see the minor variations in them. All three of these work great although we can't use the light meter in the LED model. They're all are all made in Singapore. Two have Rollei Triotar lenses and one has a Carl Zeiss Triotar lens but the image quality looks nearly identical to me,
Also, can anyone tell me why these cameras fire the flash when you advance the film? I thought our first one had bad wiring but all three of them do it.
Photograph scanned from an original hand-printed, selenium-toned print made with Ilford MG FB Classic paper.
Selenium coupled meter with flash synchronization to 1/1000 . sec. What I love about the Lynx cameras is no Light Value system, and no automation. Nothing to get between you and the camera.
IMG_0073
Photograph scanned from an original hand-printed, selenium-toned print made with Ilford MG FB Classic paper.
Direct descendent of the Sekonic meter series. Complex dial configuration. Brockway name applied during transition from one company to another. Meter was made in USA, rear plate indicates New England.
Yashicaflex S, one of the first Japanese cameras with a built in Sekonic light meter. Heliotar 3,5/80 lens. Selenium cell visible name plate flipped open. 1954
Photograph scanned from an original hand-printed, selenium-toned print made with Ilford MG FB Classic paper.
Scan of selenium toned print. My photoshop skills just aren't up to my darkroom when it comes to b&w. All my other posts thus far have been scans from negatives/slides but this scan from my print, though 3rd gen, is better than what I've been able to get out of my digital editing.
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Name: Selenium
Symbol: Se
Atomic Number: 34
Standard Atomic Weight: 78.971
Electron Configuration: 2, 8, 18, 6
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The age of this power supply box is not known. It stands in the old phone distributing center of the fortress «Furggels». All parts are precise wired and could be repaired if necessary. Old military fortress above Pfäfers, St. Margrethenberg, Switzerland, July 24, 2011.
Zeiss Ikon Ikoflex 1c
The Ikoflex 1c is very much like a 1b with the exception of course of the (uncoupled) inbuild exposure meter.
Hidden behind a blind (top of image) is a lightcell. Probably a Selenium type but i also read somewhere about a possible CdS cell. Still have to find that out.
Antwerp Central Station late on a Monday evening, so not very busy. This is the central hall, which I find very impressive.
About the image: a 5 exposure HDR generated using Nik HDR Efex, then converted to mono (duotone selenium) using Nik Silver Efex.
Photograph scanned from an original hand-printed, selenium-toned print made with Ilford MG FB Classic paper.
An old sawmill in a village close to where I live. This photo was shot from the outside through a hole in the wall. Need to get the keys some time.
This is the result of yesterdays darkroom session. It is a lith print on Fomatone MG classic, using Moersch's lith omega chemistry. I dipped it for 15 secs in selenium toner to give the shades more power. Scan of 30x30cm print.
Marking on an old, unrestored railcar at Illinois Railway Museum
Hasselblad 150mm, lith printed on Fomatone then split toned (carefully!) in selenium
The waterfall at Lassiter Mill Park in Raleigh. Added a Selenium tone to it.
Seen in Explore 10.27.2008
c1963-1966 german made - cast metal, schneider-kreuznach xenar f/2.8 38mm 4-element glass lens, compur shutter, gossen selenium cell meter, collapsible lens 126 film
Photograph scanned from an original hand-printed, selenium-toned print made with Ilford MG FB Classic paper.
This is a close up of the white fluff on my little cactus, you can see the spines in the background. Taken with a reversed 50mm lens on the front of a 105mm Nikkor Micro lens.
Selenium blue filter applied in Lightroom.
Brazil nut (Bertholletia excelsa), family Lecythidaceae, Castanha-do-Pará. High in selenium. Limit of two per day recommended.
Selenium in sandstone from New Mexico, USA. (SDSMT 3909, South Dakota School of Mines and Technology Museum of Geology, Rapid City, South Dakota, USA)
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 4900 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals.
To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state.
The rock shown above is from a "roll front deposit", in which native selenium occurs along a redox front in fluvial sandstone (see Granger & Santos, 1982).
Stratigraphy & age of host rock: fluvial sandstone, Westwater Canyon Member, Morrison Formation, Upper Jurassic
Locality; Section 23 Mine, Ambrosia Lake Mining District, north of Grants, New Mexico, USA
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Reference cited:
Granger & Santos (1982) - Geology and ore deposits of the Section 23 Mine, Ambrosia Lake District, New Mexico. United States Geological Survey Open-File Report 82-207. 70 pp.
Taken with a Fujinon-W 135mm lens mounted on a Graflex Pacemaker Speed Graphic. Printed on Fomatone MG Classic and selenium toned.
silver gelatin print
watercolor paper coated with Rollei Black Magic liquid emulsion
sepia & selenium toned
Metrawatt Leica-METER MC.
Rearside of the extracted Selenium module.
As you can see there is also a wire soldered to it here.
Besides the stamps (factory ? Batchnr. ?) also some handwritten ciphers.
9/55, Production date Sept.1955 ? Possible.
10/65, Expiring date Okt.1965 ? How cruel ;-)
The dimensions are :
Width : 36 mm
Height : 10 mm
Thickness : 0,9 mm
Photograph scanned from an original hand-printed, selenium-toned print made with Ilford MG FB Classic paper.
I bought this a while ago from a car boot. Initially They wanted two quid, at which I walked. A few weeks later they took 50p. However, it looked faulty. Still, came in a cute little zipped leather case!
Forgot all about it until this evening. I took it apart, bent a copper strip that pushes the selenium cell forwards, and hey ... it works! It might need some calibration though, I feel that it underexposes a wee bit, at least against the light meter in my Sony DSLR.