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Flash Coupler
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If you are looking for a quality digital camera, take a look at the Canon PowerShot SD500 Digital Elph. This newest model has an impressive 7.1 megapixel resolution. While megapixels do not guarantee better images, you can' t refute the S500's superior image quality.

Speed and sharpness tests proved the SD500 a top performer. Add in the enjoyable My Color feature that will most certainly please all types of users, this camera is fun.

In design, the Canon PowerShot SD500 is comfortable to hold and control. One note however is that the tightly positioned buttons on the back are easy to press accidentally during one-handed shooting. This camera boasts a large 2 inch LCD with an optical viewfinder located directly above that keeps a smooth, bright and clear image when panning.

Outside from the 7.1 megapixel ranking, the Canon PowerShot SD500 has most of the standard features of its division, including an f/2.8 to f/4.9, 7.7- to 23.1-mm (37- to 111-mm, 35mm equivalent), 3X optical zoom lens.

Both the mode dial and the menu system offer all the standard modes to include Playback, Auto, Manual (this adjusts white balance, ISO, EV compensation and color effects), Macro and Movie. VGA clips are captures at 30 frames per second in Movie mode. The menu system offers addition modes such as Stitch Assist (for panoramas) and nine preset scene modes.

The Canon PowerShot SD500 has a very perceptive user control system. It also offers an out of the ordinary shooting mode called My Colors. You can make blues, greens, or reds more vibrant, or lighten or darken skin tones.

Fantastic effects are created with the Color Accent and Swap Options. Color Accent allows you to isolate the color of one object, while the color information for the remaining portion of the photograph is removed. The result might be the bright yellow sun in the middle of a black-and-white sky.

In Color Swap mode, you select a certain color in a scene on the LCD, and then select the color you want to swap it with. For example, you could isolate the bright red of one car and swap it with the blue from another. You have to make your color selections before you shoot however, so make sure you're not going to miss the shot.

Pictures are stored in SD memory cards with the CanonPowerShot SD500. There is also a direct connection to Canon CP Printers and select BJ Printers. This basically means that you do not have to have a computer to print pictures with these printers.

The Canon PowerShot SD500 uses proprietary lithium batteries. The promoted battery life is about 160 shots with the LCD on and about 550 shots with the LCD off. You can always buy extras at you local camera store to take along with you if a long battery life is important to you or needed for the situation.

Another feature seldom seen in other cameras is an optional DC coupler found in a flap on the battery/media door. This permits you to operate the camera off AC power by means of an optional adapter while you charge the battery in the external charger that's included.

Overall the Canon PowerShot SD500 is a worthy contender in the market. A few faults to be found are that it has some difficulty finding the intended focusing point in Macro mode. Also in the Macro shots, the flash had a tendency to make most of the picture overexposed when used except for the lower portion of the image which would be dark due to the extended lens blocking the flash.

Another drawback is the mode dial design. Only the center (Manual) mode's label shows as level when chosen. The other labels (Playback, Auto, Macro and Movie) are slanted when you turn the dial.

In general, the Canon PowerShot SD500 is a smart choice for an ultracompact camera. It looks impressive and provides excellent image quality. With the addition of some out of the ordinary features, you have a smart little camera that is sure to be a top seller.

Looking into digital photography, ever want to start Learning Digital Photography? Find some great tips on how to take digital photographs with This Free Report

Air Brakes

In an air-brake system, the air compressor first takes in air into the storage tanks. Then there is the air compressor governor, which decides the amount of air that should be held within the tank. Drain valves allow air to be let into the air tanks. When the brake pedal is pressed, the air escapes out from the reservoir tanks.

Brake chambers are a jar-shaped entity that moves the vibrating disc. Push rod is made of steel which links the brake area to the slack adjuster which is responsible for maintaining the correct distance between the brake shoes. The brake S-cam rubs the brake shoes against the brake drum. Last but not the least, there is the return spring which is linked to each brake shoe and makes it come back to its normal position when not under pressure from the piston.

Emergency air brakes can be invoked by making use of a button located on the dash. Before one drives an air brake vehicle, the emergency brake button must be turned on to allow air into the system. If the air brake system develops a leak, the pressure would decrease and the emergency brake would get activated. Moreover, heavy vehicles have an added feature, namely, the exhaust break which is also a breaking mechanism that makes use of the engine rather than the air-brake system.

Water has a very undesirable effect on an airbrake system—it prevents air from gaining access to the break mechanism, causing the wheel to get jammed. In fact, this has been a major cause of accidents in vehicles that employ air-brake systems. To counter this problem, the modern air brake systems use drain valves within each air tank. Some systems also include an alcohol evaporator which adds alcohol to the air system. It mainly provides protection in cold weather by breaking down the ice that might accumulate within the system. Air couplers which are made of rubber can also give trouble at times if it develops wear and tear.

Vehicles are also provided with the stop light switch which is meant to warn the drivers behind you. This is a kind of electric switch which is controlled by air pressure. When the air brakes are applied, this light is automatically turned on, thus intimating the vehicles approaching from behind about the driver’s intention to stop.

There is also the low air pressure warning mechanism, which is activated when the air pressure falls below 60 psi. The warning is in the form of a flashing of a red light. A buzzer might also get activated at times. Another form of warning is the wig-wag. In this, a mechanical arm drops down in front of your eyes when pressure exceeds 60 psi. This arm is by default placed in the ‘can’t be viewed’ position by the driver.

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For more information on Air Brakes visit www.europeanbrakingsystems.co.uk/

Vivitar 283 flash coupler to connect to the hot shoe on a Nikon F3?

I have recently changed from OM1 system to Nikon F3, I have a Vivitar 283 electronic flash. Is there a hot shoe coupler so that I use this flash on the Nikon F3. Also will it sync up. Thanks, Ed.

You don't say how old your 283 was If its an old one you may want to go with something like the wein HS to HS safe sync slave. Some older versions of the 283 can have high trigger voltages. The ones marked "made in China are supposed to be the newer ones and to have a safe trigger voltage. Heres a good link on trigger voltages and there was a good article in this months shutterbug on using older flashes on newer cameras

http://www.botzilla.com/photo/strobeVolts.html

The F3 was made long enough ago it should be safe with higher trigger voltages but better safe than sorry

How To Build Your Very Own Jet Engine [Engine Porn]
# engineporn Haven't you always wanted a fire-breathing jet engine to power your car/motorcycle/Vespa/skateboard? Of course. Here's a handy, step-by-step guide . Have fun, and don't burn the house down! —Ed. More »

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