Night vision video see in dark equipment articles part three. The Truth, the Whole Truth, and Nothing but the Truth .. Well, hello again, and welcome to the show. It's definitely summer, as we trade heating for air conditioning. Vacations for those of us who can spare the time or money, luscious and colorful things to eat growing in the garden, cute baby animals being born or hatched, no end of work to do around the place. Dog committing felonies in the neighbor's henhouse. Hard to get excited about putting in next winter's firewood when temperature and humidity are in the nineties..
But fresh garden vegetables, bluegrass festivals and the smell of honeysuckle are some of our many blessings. After a break for one issue, we're back with this third, and last, part of our series on night vision. Please call the editors of this magazine at 2. The requirements of a tactical team who need a night sight for a sniper rifle are completely different from those of a drug unit. Do your homework, get demos, read these articles so you know what questions to ask, pick a vendor you can trust, get references, and make sure the tech guys make the decision, not the beancounters.
By doing all this, you stand a better chance of getting the proper shaped peg to fit your hole. As long as bureaucracies exist there will remain beans which need to be counted. I acknowledge the contribution of beancounters.
My acerbic comments are offered, though, after several years of watching beancounters buy the cheapest price, not the best value. This is why it's so important for the tech guys to be in the procurement loop. They'll spend years using whatever is purchased, whether it's what they wanted or not. Some night vision specs are so broadly written that I think a watermelon would qualify, and some are so restrictive that they specify technology that doesn't yet exist. If the bid is going to be wired, why waste your time and ours? Also not appropriate is to specify a Particular Brand . I think a good procurement system depends more on the capabilities of the person at the helm (or on the phone) than it does on state law or agency regulations.
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In looking at some bids that came in the mail yesterday, I find a five page bid for a huge surveillance equipment acquisition (from a department with whom it is a pleasure to work). There's an agency in the west who's letterhead would do an artist proud, and who's logo colors are so pretty that we hang them on the wall for decoration. Coating helps by reducing the amount of light that is lost through internal reflections by about 5.
This means that more of the precious light which reaches the night vision device can be put to use. Good quality lenses are hard coated with, I believe, magnesium fluoride. This coating reduces reflection and glare resulting in a brighter image, even under unfavorable light conditions. The bottom line is that coating will help produce a brilliant, clear, sharp image. One way certain manufacturers cut quality and costs in order to be a low bidder are by using substandard optics. Don't get so bogged down in intensifier tube specs that you overlook other, equally important, factors. It doesn't matter what tube you have if you can't get clear, sharp images in and out.
Most of what we observe is a lot more useful if we can capture it for future prosecution. This capability should be high on your list when evaluating night vision. Most, but not all, night vision systems are able to be coupled to a camera of some sort. The trick comes in how easy, inexpensive or versatile it is. Does the system you are evaluating require you to purchase their own special lens? Is the hookup easy and repeatable, or do you have to monkey with it every time?
Is there some provision for supporting the weight of the night vision or does it just hang off the front of the camera by the soft aluminum threads? Can the average high school educated officer figure the thing out, or do you have to call the dealer to talk you through it whenever you want to use the thing?
These accessories almost always are not standard accessories, so confirm this before you place an order. Let's start with the 3. You need a relay lens and a T ring. A relay lens threads in where the eyepiece normally lives.
Its job is to focus the image from the intensifier onto the appropriate place (optics or film) in the camera. And, actually, the image produced by the intensifier is upside down and backwards. You can see this if you look through the thing without the eyepiece attached. Another function of the relay lens is to turn the image right side up and forward again so everything comes out properly in the end. It should be obvious to the most casual observer which end of the relay lens fits the NVD. Wait, the other end doesn't fit my camera!
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The pulse position will drive a person wearing night vision goggles bananas. Night Color Camera System: Model. Unfortunately US Night Vision PVS-7 Standard Night Vision Goggles is no longer carried by OpticsPlanet. You can also explore other items in the Night Vision, Night Vision Goggles / Binoculars categories yourself to.
That's right, it doesn't. The reason is that there are numerous schemes used to attach lenses to 3.
Some are bayonet (meaning insert and twist a quarter of a turn or so), some are thread in, and so forth. This is where the T ring comes in. When you order your equipment, your salesman should have asked you to specify what camera body you would be using with the NVD. T rings are made for a particular camera. The T ring goes between the end of the relay lens opposite the eyepiece and the front of the camera body where the lens normally would attach. Each different brand has its own particular method of focusing everything to each other so I can't give you generic instructions.
Crack the manual on the thing or call the manufacturer for another copy. Experiment ahead of time. Go back and forth between everything that will focus, peaking everything repeatedly for the best overall picture. T rings usually run about twenty bucks. Save the box it comes in so you can get another one if you lose or break yours. T rings can be purchased at most decent camera stores.
If you need another one, take your camera body and relay lens to the store so they can sell you the right one. A 5. 0mm lens is considered standard, and is what usually comes with a camera when you buy it. So if you have a 5. This same manufacturer also has a .
If nobody monkeys with it, you might never have to set the focus again. Compare this to the relay lenses from most other manufacturers, where every time you remove the camera you have to refocus the whole mess all over again. I'm not allowed to mention this particular manufacturer in print, as other manufacturers throw a temper tantrum when I do.
But feel free to call my office (orifice?) at 3. Keep in mind that you do not necessarily need color film, as the night vision is all green. Neither do you need a fast film, as you are photographing the output of the night vision, not the dark night. It is OK, though, to use a fast film to let you run quick shutter speeds if you need to capture fast action.
I've found, though, that at night things don't happen very fast. Maybe this is because it is dark and people would bump into things if they moved too quickly? Try Kodak TMAX P- 3. This film can be pushed in processing from ASA 1. ASA 2. 5,0. 00, allowing for high speed action to be photographed.
Develop the negatives with D7. Push 5. 0% for 9 minutes total. Use a two stage stop bath with Photo- Flo. Process the prints with Kodak Rapid Process Film. Use an Afga actifier/stabilizer unit if you have one.
Try exposure as F1. Tri- X is the film usually used in bank cameras, which means you can get it in 1. TMAX seems hard to find.
We get ours from the place that does our new product photos, so maybe it's special purpose stuff that you might have to ask around for. You still need a relay lens, but a different one from the film camera lens. If you want to do both photography and videotaping, be sure you get both relay lenses. A video relay lens usually comes out as industry standard C mount, which will fit any CCTV camera. This is fine for fixed applications, like intensifying a CCTV camera at a prison or whatever. But if you're using a portable camera, particularly the excellent Panasonic WVD5.
WV- 3. 2XX series, you will need a bayonet to C adapter. The Panasonic AD1. Call us for details of the modification.
If you want the best, go with a separate camera and recorder (Panasonic WVD5. AG2. 40. 0 recorder). But the convenience of a camcorder is hard to beat. Get this one or whatever is the most recent model in the Panasonic industrial series when you go to buy. The AG1. 70 has power zoom, autofocus, a high speed shutter, integral time date generator, and is standard VHS. There are significant cost and performance advantages in going with a camcorder for your night vision. If you pick the proper manufacturer, you will be able to do the whole thing without a relay lens.
You merely purchase a camcorder bracket, which is custom machined for your particular brand of camcorder and the NVD. This bracket will attach to both units and provide mechanical as well as optical coupling. The entire thing makes a compact, high performance night vision/video recording system. Either the NVD or the camcorder can be removed in seconds for use independently.
You really have to see one of these packages in action to appreciate how versatile it is. This column is here for your benefit, so please make your requests known either to me or to the staff of the magazine. We do requests, and every article that we've printed here has been in response to a reader inquiry. We need your ideas for future topics.
If you ask for nothing, then that's exactly what you'll get. Where else can you go to get technical and operational information, custom written for the law enforcement officer, for free?
Cheap at twice the price. We left urgent messages for one of the LT's from a Mr. Baer, with a return telephone number of the city zoo.
Some promotions were announced at one of the agencies on April 1st, which was a joke in itself. One thing it reports is the average grade level of reading it takes to understand the article.