Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 0

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 1

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 2

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 3

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 4

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 5

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 6

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 7

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 8

Photo Research 1980A Pritchard spot Photometer, works nicely, guaranteed, US $1,500.00 – Picture 9

Photo Research 1980a Pritchard Spot Photometer, Works Nicely, Guaranteed

US $1,500.00

Antioch, California, United States
Mar 2nd

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Photo Research of Chatsworth (formerly Burbank) CA USA is the leading maker of photometers. These were made in the 1980s and cost $15000-$20000 new, but you can have it (serial D1828) for a small fraction of its new price (a Boeing or a Lockheed paid full price). All of the photos are of the actual item you'll receive, except the 2nd photo, which was of a unit I already sold (and that unit had a "wideband option"). If you need the "wideband" or other options, please let me know (and be prepared to pay more). This is a spot photometer with a viewfinder system similar to that of a single lens reflex camera. A black dot in the viewfinder covers the spot to be measured. Unlike the min-Pritchard (see my other listing) which uses a fixed half-degree spot, this one offers a choice of 5 angular sizes: 2' (minutes of arc), 6', 20', 1 degree, or 3 degrees. A 6th position was left available as an option for the buyer (some would pick a slit shape), but in this unit none was picked. In the viewfinder (ocular), your eye is treated to a 6 degree field of view. The OL7 objective lens can focus from about 1m (3ft) to infinity. Its least sensitive range is 0-2000000 foot-lamberts (like looking at the sun), its most sensitive range is 0-0.00002 foot-lamberts (night stars). To achieve so many orders of magnitude of range, it has some neutral density filters. It is calibrated in FL, but if you wanted it modified to Nits, it should not be too complicated. Ranges are in decades, and readout (mantissa) is on 0-2000 count digital display. Since detector is a photomultiplier, whose sensitivity varies with several factors, a stable internal cal reference is provided to achieve best accuracy (this is done with an internal target that glows due to decay of carbon 14 whose half life is over 7000 years). I do not have external standards to cal this item, but I can point you to some cal labs that can do it. Also, note that while a 3 and a half digit display can provide accuracy of the order of 0.1%, any photometer's accuracy is limited to about 4% accuracy by the limits of of how brightness is defined and by the crudeness of standards all the way up the chain to and at NIST. While radiance can be more tightly defined and measured, brightness meters use a photopic filter overlayed on their detector to simulate spectral response of the average human eye as determined back in 1924-1931 by CIE. Besides the photopic filter, a blue or red filter may be switched in, or a vertical or horizontal polarizer. These instruments are used on CRT and flatpanel displays, dashboard/cockpit illumination, at night road illumination,... You can Google search this item and its maker for more info. You are already offering me 14% less than you think you are: 10-11% for sales commission on items; and 3-4% for Paypal for money transfering. I suppose Paypal's 3% does buy some speed increase and consumer protection, and the 10% buys you the right to grade me with feedback, so be generous if you can. I am not looking for paycuts, and so the only reason I'll accept for offering me less on ebay is to reduce import tax into foreign lands as outlined next... I ship worldwide. International Airmail does not offer tracking and delivery confirmation, which Paypal & Ebay require. Ebay's Global Shipping Program does offer good tracking, but requires you to prepay duty based on ebay selling price. If you need to reduce tax, we need to reduce official 'sale price', which can be done by you making offer for less. I don't want to get paid less, so for me to accept your lower offer, you have to let me know that you will quickly pay me the difference in a 2nd Paypal (you'll have my paypal name from the 1st to enable the 2nd). So you can offer $100, pay it, and then pay me the remaining $1400 (don't try to skip the remainder). The tax will be cut by a factor of 15, so if you're in a country that taxes imports at 33% (many do), paying $33 tax on $100 will be a lot less taxing than paying $500 in tax. You get a 14 day right of return for refund, so long as you didn't breach tamper seals, send it back in same condition received, pack it as well as I did, and pay for all shipping. ITEM is wired for 115Vac. I can switch it to 230Vac, at no additional cost. The optical head half weighs about 9Kg or 20 pounds (so requires a sturdy tripod or stage) and the control console half weighs about 4Kg or 9 pounds. Obviously, not something to carry around for adjusting camera exposures. The smaller mini-Pritchard (see my other listing) is much lighter and smaller, but still bigger/heavier than many cameras. CALIFORNIA buyers pay sales tax.

“I do not have facilities to formally calibrate this item, however it correlates closely with others I have and had, so I believe it to measure correctly. The variable magnification ocular is stuck in the "medium" position, "high" and "low" are inaccessible”

Brand	Photo Research
Country/Region of Manufacture	United States
Model	1980A
MPN	1980A