A camera is a machine that converts optical image signals into electrical signals for storage or transmission. When we shoot an object, the light reflected on the object is collected by the camera lens, so that it is focused on the light-receiving surface of the camera device (such as the target surface of the camera tube), and then the light is converted into electrical energy by the camera device, which is obtained "Video Signal". The photoelectric signal is very weak and needs to be amplified by a pre-amplifier circuit, and then processed and adjusted by various circuits. The final standard signal can be sent to a video recorder and other recording media for recording, or transmitted through a propagation system or sent to a monitor show.
The camera uses visible light for imaging. When the light molecules of various visible light reach the CCD (photosensitive device) of the camera, the image is presented through electronic technology. When the light intensity is better, the camera's imaging is also better, but as the illuminance (intensity) of the light decreases, the imaging also becomes worse. The main manifestation is that the appearance of "noise" increases and the image also increases. It becomes blurred (such as the change of camera image at dusk). As the illuminance of the light weakens further, the color camera can no longer image.
Remove parts Remove the tape and battery from the camera before storing the camera after use. As long as the video tape is loaded into the camera, the tape will be led out by the camera's strap system, and the video recording part of the camera is in working condition. If the tape is not taken out before storage, after a long period of time, the tape that is pulled out will loosen and fall off the traction mechanism, which may cause the tie and cause mechanical failure the next time it is used. When storing video tapes, keep them away from heaters and other heat sources, not too close to strong magnetic fields, and store them upright in the original packaging box. If the battery is installed on the camera for a long time, it will consume power even if the power switch is turned off. Excessive battery discharge will affect its service life. If the battery is not used for a long time, charge and discharge it every six months.
Pay attention to moisture Put the camera in a sealed plastic bag before entering the room, and take it out when the standby device is at the same temperature as the room. The head of the camera is a vulnerable part, and its life span is not only related to the material of the head and the quality of the tape used, but also closely related to the humidity of the air in the environment. The higher the air humidity, the faster the video head wears out. Generally, the life of the head is the longest when the relative humidity is 40%. Therefore, the humidity of the environment where the camera is used and stored is most suitable to be kept at about 40%. Remove from the camera. As long as the video tape is loaded into the camera, the tape will be led out by the camera's strap system, and the video recording part of the camera is in working condition. If the tape is not taken out before storage, after a long period of time, the tape that is pulled out will loosen and fall off the traction mechanism, which may cause the tie and cause mechanical failure the next time it is used. When storing video tapes, keep them away from heaters and other heat sources, not too close to strong magnetic fields, and store them upright in the original packaging box. If the battery is installed on the camera for a long time, it will consume power even if the power switch is turned off. Excessive battery discharge will affect its service life. If the battery is not used for a long time, charge and discharge it every six months.
Stay away from the magnetic field Since the camera part uses the photoelectric conversion principle and the video part uses the electromagnetic conversion principle, the strong magnetic field and the strong electric field will affect the normal performance of its performance. In severe cases, it will cause image distortion and sound distortion. For this reason, the camera should be kept away from strong magnetic objects or objects capable of strong electromagnetic induction, such as televisions, speakers, induction cookers, transformers, etc., during work and storage.
If you have to use it outdoors on rainy days due to shooting needs, you must take measures to protect the camera from rain, such as covering the camera with a plastic bag and bringing an umbrella. Once the camera accidentally enters the water, remove the battery immediately. The faster the better, do not turn on the camera while testing whether the camera can still work, because most of the water-ingressing machinery is damaged because of this operation. If the water is very clean and the amount is not large, you only need to place the camera in a dry, ventilated, dust-free place for 2-3 days before turning it on.
Dustproof is necessary
Dust falling on the lens will affect the clarity of the camera, and will increase the inertia of the adjustment switches and knobs. The magnetic head and tape move at relatively high speed during shooting. The dust on the magnetic head or tape will damage the head like sand And tape. In order to prevent dust from entering the camera and polluting the movement, drum, viewfinder, liquid crystal screen, and lens, effective dust-proof measures must be taken. For example, when shooting in a sandy environment, cover the camera with a transparent plastic bag, or make a simple dust-proof belt to cover the body. When you carry the camera, you should put the camera in a special bag or box. When you stop shooting, you should always cover the lens cover and install a UV lens in front of the lens. It can effectively prevent dust and raindrops from entering the lens.
Pay attention to shock
When carrying and using the camera, pay attention to shock and drop resistance. Take out the battery tape when traveling to avoid violent vibration of the camera, such as putting the camera in the rear luggage compartment of a car. Severe vibrations and external impacts will damage or even deform camera parts. Do not use a tripod to take selfies on uneven ground or crowded places to prevent the corner stand from being knocked down by tourists, and try not to let children operate the camera.
Description: Image Sensor 1/3" COMS Sensor Horizontal Resolution 1200 TVL TV System NTSC/PAL changeable Image 16:9 WDR D-WDR Min, Illumination 0.005Lux at F1.2 Lens 2.3mm lens Synchronization Internal Electronics Shutter PAL: 1/50-100,000 NTSC: 1/60 - 100,000 S/NRatio more than 52dB (AGC OFF) Video Output CVBS Audio YES Auto Gain Control YES BLC YES Camera OSD YES DNR 2 DNR Day/Night Auto/Color/B and W Wide Power Input DC 4.5-40V Work Temperature -20 - +60 degrees Celsius Work Humidity 20 - 80 Percent Product size: 1.90 x 1.90 x 1.90 cm / 0.75 x 0.75 x 0.75 inches Package weight: 0.076 kg Package size: 5.00 x 5.00 x 4.00 cm / 1.97 x 1.97 x 1.57 inches
Package Contents: 1 x Camera, 1 x Wire, 2 x Screw.
Camera technology has evolved tremendously in the last two decades. Features that used to be reserved exclusively for professional models are now available on point-and-shoot cameras that are accessible to photographers of all skill levels. New digital cameras can be extraordinarily tempting and it doesn't help that manufacturers bombard consumers with the promise of superior image quality and fancy packaging. Yet the question nags: Do I really need a new camera?
Top
5 Signs That You Need a New Camera
If the sight of shiny new digital cameras makes you salivate, it may be hard to resist an upgrade. However, before making a purchase you might later regret, it's important to do some self-evaluation. Prior to emptying your wallet on an upgrade, take a look at the top 5 signs that you need a new camera:
1.
Megapixels
Megapixels matter more if you regularly print larger shots. The
average point-and-shoot digital camera features six to ten megapixels, which
produces solid 4x6 and 5x7 prints. However, if you are in need of a camera that
prints decent 8x10 or 10x15 size images, then you might consider upgrading to a
model with more megapixels to insure high quality resolution. The average
family shutterbug using his camera primarily to shoot junior's football games
may not need the same amount of megapixels as a burgeoning wedding photographer
whose clients routinely request photo enlargements.
2. Shutter
Lag
Sports photographers need to spend a lot of money on fancy
cameras because it's nearly impossible to shoot action photography with
standard digital cameras that feature an annoyingly long shutter lag. If you
find yourself in situations where you absolutely must get the shot, no matter
what, you might consider spending extra to purchase a fast camera with limited
shutter lag.
3. LCD
Screen
If your vision is limited and your camera's LCD screen is the size of a postage stamp, you might consider upgrading. Most newer model digital cameras come with standard 3-inch LCD screen. Larger LCD screens are great for defining and sharing images. In addition, bigger, advanced screens provide exceptional resolution and eliminate distracting reflections when shooting outdoors in direct sunlight.
4. Style
For some photographers, the look of a camera is more important than its technical features. If you are the type who wants your camera to make a fashion statement, as well as taking great photos, you might consider purchasing newer models that come in a rainbow of colors. No longer are you limited to classic black or silver cameras. These days, you can tote around stylish aqua blue, pearl white or ruby red digital cameras.
5. Weight
and Size
A camera's size and weight are major factors for photographers
who never leave home without their photo equipment. Most modern compact digital
cameras weigh well under half a pound. However, ultra-compact digital models,
which can easily slide into your back pocket or purse weigh significantly less.
If your shooting needs necessitate carrying a small, lightweight camera, you
might consider upgrading to a sleeker model.
Bottom
Line
A new high-tech camera on its own will not make anyone a better
photographer. Compelling images are the result of superior skills and
knowledge. A new camera is nice to have, but if you spend thousands of dollars
on a professional grade camera only to park in automatic mode the entire time,
you might not be getting your money's worth. The camera is just a tool to
provide the means to an end product--the image that you, the photographer,
create.
Sony has unveiled an all-new compact vlogging camera champ, boosting stills and video performance in its flagship compact camera range. The RX100 VII gives you pro tools, but in a pocketable device.
For the past few years, the RX100 series of compact cameras has gained a fairly large following among vloggers.
Since it manages to cram in some awesome high-end recording capabilities
and fast autofocus into a very compact body, it's become a firm favourite. The
RX100 VII is no different.
As well as offering 4K resolution shooting, the RX100 VII also shoots HDR
(Hybrid Log Gamma) as well as offering various shooting profiles for those who
like to colour grade their footage.
It has interval shooting for time-lapses, super slow motion recording up
to 1000 frames per second and a 180-degree flip-out screen, so you can see
yourself on screen while vlogging to camera.
That, plus the fact that it has a mic input, as well as an optional extra
Shooting Grip, means this is primed and ready for just about any kind of
shooting you want to do.
It's not just about video makers though, its still capabilities have seen
something of a boost too, with Sony claiming it crams in Alpha 9 level
performance into a compact camera.
It starts with a new Exmor RS CMOS processor with 20.1-megapixels that
combines with a DRAM chip and the latest BIONZ X image processor to produce
great results.
That means you get 60 autofocus and tracking calculatios per second, and
20fps burst shooting without the screen blacking out at all during the
burst.
In short, all of this means the camera tracks, shoots and focuses
incredibly quickly, all thanks to those new sensors and processors.
Being a compact camera, you also get a built in, non-removable lens
offering focal lengths between 24-200mm with aperture ranging from f/2.8 to
f/4.5. What that should mean is you can get everything from nice wide shots, to
super close, highly magnified zoomed in photos.
For the first time in a compact system, the RX100 VII has real time
tracking and real time eye autofocus, which makes use of AI object recognition
to make sure that your subject is in focus accurately and quickly.
More specifically, it locks on to a person or animal's eyes to ensure that the right part of the subject is in focus. So accurate, in fact, that Sony states you only need to worry about composition, and never have to think about whether it's in focus or not.
SJ7000 2.0 Inch Screen 1080P WiFi Novatek 96655 Chipset Sports Video Camera Camcorder with 170 Degree Wide Angle Lens Support 32GB TF Card
Details
Description: This SJ7000 multi-functional sports DV, high-quality element to capture clear picture and shoot full HD videos. Durable waterproof design makes it more suitable for outdoor extreme risk. It supports 32GB TF card as the saving equipment, so scenery recording all the way won't be missed. With easy to use and high performance, it is really a wonderful action camcorder for you.
Main Features: WiFi function 2.0 inch high resolution capturing 1080P / 720P FHD video High-definition digital motion video recording device Ultra compact and lightweight design Video recording while charging Dynamic pixel 5000000, static pixel 12000000 Crystal clear HDMI output Support micro SD card up to 32GB (not included) Perfect for outdoor sports, extreme sports, home security, car DVR, etc. High-definition video recording It is easy to take photos and videos Versatile functions: It can record voice, still image and video Waterproof shell, suitable for outdoor activity 170 degrees wide angle is perfect for catching more details Ideal companion for sports and outdoor enthusiasts Can't install the external microphone
Chipset: Novatek 96655 Chipset Name: Novatek Features: Wireless Function: Motion Detection,Loop-cycle Recording Model: SJ7000 System requirements: Mac OS x 10.3.6 above,Win 7,Windows 2000 / XP / Vista Type: Sports CameraClass Rating Requirements: Class 10 or Above Max External Card Supported: TF 32G (not included)Screen resolution: 960 x 240 Screen size: 2.0inch Screen type: LCDBattery Type: Removable Charge way: AC adapter,USB charge by PC Working Time: About 90 minutes 1080P 30fpsDecode Format: H.264 Exposure Compensation: +1,+1/3,+2,+4/3,+5/3,-1,-1/3,-2,-2/3,-4/3,-5/3,0,2/3 Image Format : JPG Microphone: Built-in Video format: MOV Video Frame Rate: 30FPS,60FPS Video Output: HDMI Video Resolution: 1080P(30fps),720P (60fps) Video System: NTSC,PAL White Balance Mode: Auto,Cloudy,Daylight,Fluorescent,TungstenHDMI Output: Yes Interface Type: HDMI,Micro USB Language: English,French,Italian,Polski,Russian,Simplified Chinese,Spanish Loop-cycle Recording : Yes Motion Detection: Yes Night vision : No Time lapse: No Water Resistant: 30m Waterproof: Yes WIFI: Yes Camera Timer: No Auto Focusing: No Anti-shake: No Aerial Photography: NoPackage size (L x W x H): 28.00 x 18.00 x 7.00 cm / 11.02 x 7.09 x 2.76 inches Package weight: 0.588 kg Product size (L x W x H): 8.00 x 8.00 x 4.00 cm / 3.15 x 3.15 x 1.57 inches Product weight: 0.536 kgPackage Contents: 1 x Sports Camera, 1 x USB Cable, 2 x 3M Double-sided Adhesive, 1 x EU Charger Adapter, 1 x Steel Wire Rope, 4 x Ribbon, 4 x Bandage, 1 x Waterproof Back Cover, 10 x Install Accessories, 1 x English-Chinese User Manual
Before you buy a used DSLR camera, there are a number of factors you should consider.
Should I Buy a Used Camera?
Digital single-lens reflex (DSLR) cameras are not cheap. Professional grade digital cameras like those manufactured by Nikon, Canon and Kodak sell for hundreds of dollars. In addition, with technology changing by the minute, today's new digital camera is often tomorrow's cast off. For these reasons, many photographers purchase used DSLR cameras.
Before you decide to buy a used DSLR camera, ask yourself these questions:
Are you familiar with the basic
features of a DSLR camera?
Do you plan to purchase the camera
from an online retailer?
Do you have an existing DSLR
camera?
Have you bought used photo
equipment in the past?
The answers to the
aforementioned questions may help you in your decision-making process. In
addition, the following tips can also come in handy as you venture into the
used camera market.
Factors to Consider When Shopping for a Used DSLR Camera
Keep these points in mind
while you examine your used camera selections:
Condition
First and foremost, you want to make sure that the camera is in
decent shape. Inspect the entire body of the camera for any traces of abuse or
damage. Minor scratches and scuffmarks are normal, but pronounced divots and
dents are not. It's easy to tell if a camera has been well maintained. It
should be intact and dent-free. Pro-level DSLRs are built to withstand
environmental factors and the rigors of frequent use, so you should be able to
find a camera in good shape provided the previous owner didn't neglect it.
Sensor and
Shutter Inspection
Sensor:
You can test a DSLR's sensor by shooting an unfocused white wall at f/22 and
downloading it to your computer. View the shot at 100 percent and look for
sensor scratches. Dust spots are normal, but large marks are not.
Shutter:
It's important to inspect the shutter curtain for excessive wear and damage
before purchasing a used DSLR camera.
Picture Counter
DSLR cameras are designed to take between 100,000 and 250,000 images before the shutter may need to be replaced. In order to get the biggest bang for your buck, it's a good idea to find out how many photos have been snapped with the used camera you are interested in purchasing. The more life you have left on the original shutter, the better the buy. Many high-end DSLR cameras allow you to find out exactly how many pictures a camera has taken by using a counter feature, which can be downloaded for free from the camera manufacturer's website.
Auto Focus
No one wants to spend
hundreds of dollars on a DSLR that has a compromised auto focus feature. To
test for auto focus accuracy, use an existing lens that you know works well and
attach it to the used camera. Then, set the lens to its widest aperture and
start shooting. Next, download the photos to your computer and check for
front/back focus.
Buttons,
Flash and Connections
Buttons:
Make sure all of the camera's buttons work well. They should not stick or take
an inordinate amount of pressure to function.
Flash:
Take test shots to ensure that the flash feature works.
Connections:
Inspect all of the camera's terminals, sockets and connection points. Make sure
you can connect the camera to a computer to download pictures and that the TV
out connector is working.
Pixels
Prior to purchasing a used DSLR camera, ask the seller whether
there are any dead pixels. It's not uncommon for older DSLR models to have a
few dead pixels. If it has more than 15 or 20, however, you might consider finding
another camera.
Serial
Number
It's not a good idea to purchase a used DSLR from someone who doesn't have the camera's original box, paperwork, and sales receipt. If you are not familiar with the seller, check the serial number on the camera and run it through a stolen photography equipment registry like Photo.net.
Where to Buy a Used DSLR Camera
Used DSLRs are sold at various camera stores as well as pawn shops and home and electronic retailers. However, the majority of used DSLR cameras are purchased via the Internet. Websites such as eBay and Craigslist feature dozens of used DSLR cameras. Unfortunately, the downside of doing business online is that you will not be able to test the equipment before shelling out your money. If you are thinking of buying a used camera from an Internet source, do some research first to make sure the seller is reputable.
