View allAll Photos Tagged selenium
Here's how to replace a selenium cell from an Argus CC exposure meter.
Take the CC meter from the camera, remove the six little screws around the sides. Then pull the cover from the bottom (pic 1).
Remove the two nuts and the washers from the dial plate, then carefully remove the dial plate, avoiding bending of the needle.(pic 2)
Now try to remove the selenium cell that is frictioned between the front and the magnet of the meter. There may come loose a rectangular frame that should be positioned back at the front of the selenium cell.
Pic 3 shows the removed sel.cell. On pic 4 you can see the replacement cell, it is a bit longer than the original one.(This cell was an old one, taken from a broken exp.meter and had a date from 1940 on its back!) With a Dremel tool you can adjust the size,
pic 5.
Your new cell should read at least 250mV when connected to a Voltmeter in full daylight. pics 6, old cell, pic 7 new cell.
Then place back the new cell where the old one was seated. Et voilà , the meter is working again!, pic 8.
Then work the reverse from pic 2 , replace the cover and the little screws and replace the meter. Now you can calibrate the meter with a reliable working meter. To compensate for stops you can set a filter factor as a corrector. My replacement was one stop lower than it should be. For me no problem.
It took me about 1,5 hour to perform this , so it's not a big job. Good luck.
Viscri, Weißkirch, ein Dorf voller Sachsenhäuser, mit einer schönen Wehrkirche und einem geschäftigen Hauptplatz ...
Agfa MCC in Eco4812 + selenium/gold
The Selenium element was known to science in the late 1800s as having the property of outputting a voltage when exposed to light, but the amout of output was so small and fleeting in its output characteristics that it made it little more than wondrous novelty to early electricity scientists and their backers of the day. Then somewhere around the late 1920s, Weston figured out how to meld this element with other others to stabilized this earliest of solar cells and make their output large enough to drive one of their most efficient meter movements of the era like the Weston 301 movement which is used on this early generation foot-candle meter modeled 614 and set out out to make a device that could be used to reliably and repeatably measure all manner of light sources and provided a handy guide for establishing lighting standards for home, work and industry. Weston originally thought about using it for automatically triggering street lighting to come on when it got dark and turn back off once the sun rose bright enough to trigger the off switch. It also got adapted into elevators to stop the doors from closing when a person broke the beam to switch the door back open. Relays, were also a going concern in Weston's affairs and they excelled in all of these various studies in electricity.
There were a handful of these models made from very compact to more industrial sized models aimed strictly at industry users. The whole craze of photography also leaped on board with this as well, as Weston helped to establish a means of scientifically setting up your camera settings based on the light in the shot. Film makers of the day as well took hold of all this new technology Weston brought to the playing field and Weston made specific meters for them as well.
A very nice example of an early Russian professional exposure meter made in 1952 at the MKIP factory in Moscow.
Selenium Light Meter, swiveling head, bakelite body. Iris diafragm to reduce strong light,
body serial # 189 .... marked EP-3 No 189. Accessory diffusor disk and honeycomb lens with matching serial numbers. Still working.
A Sea&Sea selenium cell UW exposure meter (at the right) and a simple Weston Pixie selenium exposure meter in an A.Giddings U/W Enterprises underwater housing. Take it with you while diving and you're guaranteed to reach the bottom because of its weight. (500+ grams against the 100 grams of the Sea&Sea).
Photographié à / taken at Québec City.
Printed on Agfa fiber matt paper. Selenium toned (Ilford).
Developpé sur du papier fibre matt d'Agfa. Virage au sélénium (Ilford)
Older picture, going back when Nox's dark room (Quebec city) was still operational (2006)... - It was a happy time, as most photographers had already deserted film at that time. I had an unlimited access to the facility... :-)
La photo remonte à 2006 et avait été développée dans la chambre noire du club photo Nox (Québec). C'était une époque heureuse. Beaucoup de photographes avaient déjà deserté la pellicule au profit du numérique... J'avais un accès illimité à la chambre noire... :-)
The picture was slightly unsharp as it was taken through a window...
Nikon F90x
I do not remember the lens. Possibly the old Tamron 28-300 lens with a circ. pol.
Ilford Ilfosol S
Agfa fiber matt paper
Diffusion enlarger / The sky was burned.
Ilford developer
Selenium toner (Ilford)
Canon 4400F scanner
A selenium meter from 1949. Made in the UK for Ilford by AVO. Very little life is left in this one.
A lot of information is on Maurice Fisher's site:
The selenium cell of this meter is part of the dial plate, the dark-gray area. The cell position design was patented by Bruno Lange. See picture 6831176332
===============================
©2015 Fernando Lopez Arbarello - All Rights Reserved
FINE ART PRINTS AND PRODUCTS: www.arbarello.com/FLA-150811-ND800E-26063-bw-selenium
Westphalen exposure meter 1932, constructed of a Weston Photronic selenium cell and a Weston type 301 milliamp meter. Could be regarded as the first photoelectric exposure meter in the world without a battery. Pictured in the George Eastman House, Rochester, NY
Footed early Metraphot selenium exposure meter for Leica. This was the first model that Metrawatt produced for a Leica around 1934. Body of brown bakelite with adapted time scale for Leica on the dial plate and embossed on the outside of the body.
Another type of Samoca handheld light meter from the 1950's.
Name obtained from advert www.flickr.com/photos/amberflykezzie/5033026908/in/set-72..
Note! Same model available with silver colour panels instead of the black above.
Portsmouth, Hampshire, UK. Original photograph taken on Olympus OM4-Ti, Ilford Delta 400 35mm; Xtol 1+1. Negative scanned and enlarged via digital negative to hand coated Fabriano 5 HP paper. 8"x10" print. Selenium toned prior to fixing.
Small Bewi Piccolo selenium light meter. The dimpled on the front are the light receptors. This is the smallest meter I have ever seen
Reference FIle: FLA-160806-ND800E-517-BW_selenium
Infrared Underwater Photography
©2016 Fernando Lopez Arbarello - All Rights Reserved
Fine Art Photography by Fernando Lopez Arbarello
I was imagining what you'd see if an early 19th century press photographer got taken back in time to the dinosaurs (except of course dinosaurs would have had skin)
T-Rex toy skeleton posed with some basil and a oil painted landscape backdrop
Photo Tim Drysdale, Printing Lachlan Young. Praktika 35mm, f/1.8 50mm, Delta100, Adox warmtone RC 12'' by 16'' paper with Selenium toning
Warning affixed to a power supply cabinet inside one of the Nike Hercules launch and guidance control vans.
Obsolete today, selenium rectifiers were commonly used in military and civilian electronic equipment during the service life of the Nike Hercules system. While they were more reliable than vacuum tube rectifiers, this warning is a testament to the hazards they could pose when they did fail.
Nike Hercules Site SF-88L, the only restored Nike Hercules launch site in the United States. It is located within the Golden Gate National Recreation Area in Marin County, California, north of San Francisco.
Nike Missile Site SF-88L (National Park Service):
www.nps.gov/goga/nike-missile-site.htm
Golden Gate National Recreation Area
(National Park Service)
MIM-14 Nike Hercules (Wikipedia):
en.wikipedia.org/wiki/MIM-14_Nike_Hercules
"The Last Missile Site: An Operational and Physical History of Nike Site SF-88, Fort Barry, California"
by Stephen A. Haller and John A. Martini: www.holeintheheadpress.com/last_missile_site.html
"Winged Victory: The History of the Nike Missile Training Program At Fort Bliss" by William A. Dodge, Ph.D. and Timothy L. Sawyer, Ph.D.
I found this on local bike trail.
The irony was striking. I printed this when I first learned to lith print so needless to say if wasn't as good as I wanted. I recently came back to it and I am really pleased with it now.
35mm Tri-x shot with a Contaflex 50mm, Fomatone paper in Rollei lith 1:1:50 with about 25% old brown, shadows toned in selenium
This shot was taken in Pascoag, RI for my "Best Camera Project" using an Olympus E-600.
A very intense, fast moving thunderstorm raced by around 2:30 this morning. Flashes of lightning were near constant, but since the thunderhead was pretty large, few of the bright flashes had visible bolts... come to think of it, there were only a couple of thunder reports that were even nearby. This is actually the only catch I made out of about a hundred shots.
Strike the Blog: www.snaphackphotography.com
General Electric DW-68 selenium cell exposure meter, probably dating from the 1950s - 1960s.
These old selenium cell meters last forever. This one works perfectly.
This style meter reminds me of the hand-held phaser weapons from the original Star Trek television series.
Sometimes I feel like I nut. I rarely don't. It's tough to pick a favorite when the competition includes cashews, almonds, pistachios, peanuts (not really a nut, yeah yeah), and macadamias. But I think I go for the gorgeous Brazil nut, with its pitted, finished-hardwood skin and porcelain white meat.
From Twelve Things You Should Know About Selenium":
"9. A nut a day keeps the blues away. The Brazil nut is the richest of all foods in selenium, and eating a single nut a day will guarantee you are never deficient, says Dr. Donald J. Lisk, director of Cornell University’s Toxic Chemical laboratory. He found that Brazil nuts are grown in selenium-rich soil providing a super high content of the mineral, about 2,500 times more than other nuts. Eating half a dozen nuts rapidly boosts blood selenium levels by 100350 per cent. The taking of selenium in supplementary form is both expensive and unnecessary provided the foods listed are eaten on a regular basis."
And there are some good reasons to boost your selenium.
Selenium colour effect to enhance the moonlit effect. The other photo uploaded has no alteration to colour and the 5 minute exposure in moonlight makes it look as though it is daytime-view it to compare to this one.
This image has had no colour adjustments and the light from the moon and the security light from the Manse was enough to illuminate the church in the full spectrum of wavelengths of light and thus give it afull colour 'daytime-like' appearance. I felt this was not atmospheric enough and redone this image in a selenium tone to ehance the moonlit mood. See accompanying image for comparison.
Crichton Church was founded on 26 December 1449 by William Crichton, 1st Lord Crichton, Lord Chancellor of Scotland "Out of thankfullness and gratitude to Almighty God, our Lord Jesus Christ, the Blessed Virgin Mary, St. Kentigern and All Saints", with the consent of his son, James of Frendraucht and confirmed on the 29 December by James Kennedy, Bishop of St Andrews. Like many other collegiate churches, Crichton was built for the use of the local lord, and a provost, eight prebendaries, two choir boys and a sacrist were appointed to pray for the souls of the Crichton family. The provost was granted the tiends and tithes of the prebends, the Rectory of Crichton and the Temple lands appertaining to Crichton.
The church was built in a Gothic and Romanesque cruciform style with a large central tower; the nave was used as the place of worship for the poor people. This continued until the Scottish Reformation of 1560 when it was considered unusable.
By 1569 it was being used as the parish kirk (church) and a minister, Adam Johnston, was ordained to lead the service. By the 1580s, major restoration work began, though the nave was said to be ruinous, as it is to this day. In 1641, by an Act of Parliament, Crichton Church was declared to be the parish church for all time. Though there was more restoration and adaptation in 1729 it was considered to have been carried out "badly". More work in the 1820s helped to bring the old church back to life, but it was not until the end of the 19th century that the church was fully restored, by the Edinburgh architects Hardy & Wright. Stained glass windows were installed at this time