View allAll Photos Tagged selenium
Adox Variotone in Fatman - MT3 - MT3 & MT1
middle: bleach somewhat stronger as usual to illustrate the toning effect
1+40 45 secs, toner 25+7+500ml 45 secs
right side: followed by a strong selenium toner 1+10 2 mins
view large for details
Made by Mamiya for Sears
©1960
Tower 10A has a Mamiya-Sekor f2.8 / 48mm lens
35mm Rangefinder with a selenium meter
3/4-front view of selenium* rectifier lamphouse power supply for the RCA Arc 400 carbon-arc 16mm movie projector, showing the current control. A fan located at the base of the power supply forces air upward to cool the transformer and rectifier stack.
This nearly-60 lb. (27 kg.) chunk of mostly iron and steel outputs 30 amperes at 28 volts, or about 840 watts, when carbons are properly aligned and the current control is adjusted to achieve the specified current.
*The specification plate on the back says "selenium" but it looks like it was retrofitted with a pair of high-current silicon diodes mounted in heat sinks along with a large electrolytic capacitor to smooth the DC output.
Holga 120N Delta 400 @640ASA in Finol
Adox Variotone in SE6 Blue
MT1 Selenium 1+20 1 min
shorter bleach and stronger toner as the previous one
bleach 1+100 30 secs, MT3 c
Selenium light-cell lens detail. Field of view about 1 inch wide. Reminds me of a honeycomb.
(CC BY-SA which means anyone can use any size of this image anywhere provided accompanied by the credit: Image: George Rex Photography)
Konica IIIM with closed exposure meter flap. Meter is switched -off . Thr connection with the selenium cell is made through the little prong you can see just in front of the acc. snoe.
Selenium match-needle light meter, c.1961. Bakelite-type plastic case with metal discs on the calculator. Marked in GOST (ГОСТ), with a conversion table for ASA and DIN on the back.
Slightly unusually, the scale has bright on the left and dim on the right (as though it was designed to be held the other way up).
A discarded boot that washed up on a Lake Erie beach, rendered as a selenium print.
My tribute to Edward Weston's Abandoned Shoes Alabama Hills.
Bought this from a gentleman around the corner who later turned out to be a good friend. I have no idea how this works, just what it states on the case. I don't work with selenium rectifiers much so it's basically a dust collector. As always, the day I get rid of it, I'll need it.
The original print of this 4x5 negative was a little disappointing. Some plugged shadows, a lot of muddy midtones and a featureless sky. It was suggested to me to treat with Selinium to richen the midtone. The side benefit is the selenium found some sky detail to tint, All in all I like this a lot. Vignette was added later in lightroom
Canon FTb, 35mm
Kodak Aerecon f5.6 1/30
Lith printed on Ektalure X (tapestry surface), toned in selenium.
Sculpture "York: Terra Incognita" by Alison Saar, at Lewis and Clark College, Portland. Wiki page about the sculpture here.
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
-----------------
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.
An early auto-exposure 35mm compact. c.1962. This is a plain viewfinder camera; there were also rangefinder versions, the EE Merit (?) and EE Super Merit.
Lens: 40mm / f2.8 in a Seikosha shutter.
It has the same "M" patterned covering as the Mamiya Korvette (a.k.a. Family) {you can just about see this in the large version}.
This came in a job lot from ebay, described as good condition, but was actually caked in dirt, dented in several places and has had the shutter/lens/light cell taken apart and not put back properly - hence it doesn't work!
fomaspeed variant III mg 312, rollei lith, selenium 1+1+9, neopan ss @200, heliar classic 50/2, yellow-green #11, bessa r2a, hc-110.
scanned negative: www.flickr.com/photos/501rf/2517383190/in/set-72157605200...
(more informative links in comments below)
Remember, if your camera comes with selenium light meter like the Olympus Trip 35 (think Agfa Optima or Silette, certain Voigtlanders, Werras) they need to be kept in the dark or it will exhaust the cell.
Never buy one on display in a bright counter without a lens cap. The meter will most likely be on its last legs.
The camera won the 1968 Good Design award.
The Olympus write up on the camera goes:
The Olympus TRIP 35 is a full-sized compact EE camera based on the Pen EES. It first went on sale in 1968. The name reflects its suitability as a convenient camera to take on trips. The TRIP 35 became very popular as a camera that combined ease of use, reliability and a low price with superb photographic performance. It remained a best-seller for many years, and over the next 20 years over 10 million were produced.
silver gelatin print
watercolor paper coated with Rollei Black Magic liquid emulsion
sepia & selenium toned
My grandparents' old GM Model B Standard Exposure Meter. It's got a slide rule on the back for you to determine your f-stop/shutter speed. I learned from a friend today that this is, in fact, powered by Selenium! And it still works!
Note: Another neat fact: This is from around the 40s! And you can get one for, like, $20!
Out of the case. The case has a hole at the end for the lanyard loop and a metal clip across the bottom which engages into two holes to hold the meter in - very effectively.
See also cased view for more description.
Minolta Autopak 500 ~1966
Rokkor 1:2.8 f38mm
Shutter speeds 1/90, 1/40 in flash mode.
Double stroke film advance.
Zone focus by means of metal knob on the camera side.
Selenium meter controls the exposure aperture or the auto flash mode, if a flash cube is present. The aperture is coupled to the focus zone in flash mode.
Uses 126 film cassettes.
A simple look but loaded of features.
Fomatone 131 paper
Meorsch easy lith, 30+20+1000+50 ob at 30°C
Selenium toner 1+20 1 minute
24 cm x 24 cm
Leica m7, Summicron 35 asph, neopan 1600. XTOL stock, 6´. Fomatone MG WT Glossy 131. Selenium+gold toning. Scan from print
Please don't use this image without my explicit permission. © All rights reserved.
With incident-light diffuser half in place. The diffuser stores in a small pocket inside the case.
A match-needle selenium device, c.1962.
(That's the end of Light Meter Week chez Awcam).
A color temperature meter with scales for color filter correction. Production started in 1957 with the white model, followed by the black and later the grey models.
It sound better in swedish where the word "utanförskap" (exclusion) have been a political term used by all parties when speaking, in a simplified way, about people who are unemployed, sick or everybody who is not working...
Scanned papercopy
Nikon Fm3a
Nikkor 28mm f/2.8 Ai
Plus X
D76 1 1
----------------------
Adox Nuance Normal/Hard 24X30
Fujimoto G70 with Condenser head
EL-Nikkor 50mm f/2.8
Exposed for 20s at f/5.6
Developed for 5min in Ilford Mg developer
Toned in Selenium 1 10 for 1 min (?)
Nikon F90X. Película Argenti Pan-X 100 Iso (Similar a Agfa APX-100) Revelador Gago StacP2 1+9 25ºC.5 minutos. Papel Foma Fomatone 131. Revelador Gago ToqueGrafic+ Softonate. Virado al selenio-sulfuro. 18x24 cm.Selenium-sulphide toned.
Combarro, Poio, Pontevedra. Agosto 2008.
Cemetery next to a green church somewhere in the Western Fjords of Iceland
Hasselblad with 150mm+tubes, Acros film, printed on Ilford MGWT plus selenium
A selenium meter for mounting in the accessory shoe. Dimensions: 31mm diameter at the end of the hood, 39mm long (1 1/2 x 1 9/32 inches).
Shoe mount (foot?) is hidden on the other side.
Slightly unusual in having a concentric circle pattern on the cell window, rather than the conventional honeycomb .