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A digital single-lens reflex camera (as know Digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film. The reflex design scheme is the primary difference between a DSLR and other digital cameras. In the reflex design, light travels through the lens, then to a mirror that alternates to send the image to either the viewfinder or the image sensor. The traditional alternative would be to have a viewfinder with its own lens, hence the term “Single lens” for this design. By using only one lens, the viewfinder of a DSLR presents digital cameras in that the viewfinder presents a direct optical view through the lens, rather than being captured by the camera’s image sensor and displayed by a digital screen.
DSLRs largely replaced film-based SLRs during the 2000s, and despite the rising popularity of mirrorless system cameras in the early 2010s, DSLRs remain the most common type of interchangeable lens camera in use as of 2018.
WHY DSLR POPULAR?
DSLR COMPARED WITH OTHER DIGITAL CAMERAs?
The reflex design scheme is the primary difference between a DSLR and other digital cameras. In the reflex design scheme, the image captured on the camera’s sensor is also the image that is seen through the view finder. Light travels through a single lens and a mirror is used to reflex a portion of that light through the view finder - hence the name Single Lens Reflex. While there are variations among point-and-shoot cameras, the typical design exposes the sensor constantly to the light projected by the lens, allowing the camera’s screen to be used as an electronic viewfinder. However, LCDs can be difficult to see in very bright sunlight.
Compared with some low cost cameras that provide an optical viewfinder that uses a small auxiliary lens, the DSLR design has the advantage of being parallax-free: it never provides an off-axis view. A disadvantage of the DSLR optical viewfinder system is that when it is used, it prevents using the LCD for viewing and composing the picture. Some people prefer to compose pictures on the display-for them this has become the de facto way to use a camera. Depending on the viewing position of the reflex mirror (down or up), the light from the scene can only reach either the viewfinder or the sensor. Therefore, many early DSLRs did not provide “live preview” (i.e. focusing, framing and depth-of-field preview using the display), a facility that is always available on digicams. Today most DSLRs can alternate between live view and viewing through an optical viewfinder.
DSLR CAMERAs TREND?
If you’re looking to take your photography game to the next level, you’ve probably considered making the jump from your smartphone or point-and-shoot to a DSLR. Due to the ability to switch out lenses and adjust every setting imaginable, digital single-lens-reflex cameras, more simply referred to as DSLRs, are the tool of choice for new and seasoned photographers alike. Once reserved almost exclusively for professional photographers, DSLRs have gone mainstream with entry-level models starting at just a few hundred dollars. The latest DSLRs offer stronger performance and features than earlier models, as well as the ability to capture high-quality videos. 2018 will bring lots of new camera technology, but it’s still a great time to buy. So if you’re in the market for a new DSLR or looking to trade up, here are current favorites.
Best DSLR camera overall
4.5 out of 5
Canon EOS 5D Mark IV
Best full-frame DSLR camera
Not yet rated
Canon EOS 80D
Best APS-C DSLR camera
4 out of 5
Best cheap DSLR camera
4 out of 5
TIPS TO SELECT DSLR CAMERAs?
So how do you decide which DSLR to buy? There are an increasing array of them on the market so you have a real choice ahead of you.
Here are a few factors I’m using before to consider when looking for a DSLR:
1). WHAT WILL YOU USE IT FOR?
-When you head into a camera store to purchase any type of question the first thing most sales people will ask you what type of photography you want to do. It is well worth asking yourself this question up front as it will help you think through the type of features and accessories you’ll need.
Will this be a general purpose camera for recording ’LIFE’? Are you wanting to travel with the camera? Is it for sports photography? Macro Photography? Low light Photography? Make a realistic list of the type of photography you will use it for (note I said ‘realistic’ – it’s easy to dream of all kinds of things you’ll photography-but in reality most of us only do half what we think we will).
2). THINK ABOUT PRICE
-DSLRs price range in price from some quite affordable deals at the lower end to extremely high prices at the professional end. Set yourself a budget for your purchase early on but make sure that you keep in mind that you’ll need to consider other costs of owning one including:
a). Batteries (all models will come with one but if you are travelling you might need a spare).
b). Lenses (some deals offer ‘kit lenses’ but you should consider upgrading)
c). Camera Bag (some dealers will throw one in-but once again don’t expect a high quality ‘free’ bag. Your DSLR is something worth protecting – invest in a good bag).
d). Memory Cards (some models come with one but most are inadequate in terms of size. Even if you’re lucky enough to have one included you’ll probably want to upgrade to at least a 1 gigabyte card).
3). DSLRs RESOLUTION
-How many megapixels does it have is a good question that is often one of the first to be asked about a new camera. While I think ‘megapixels’ are sometimes over emphasised (more is not always best) it is a question to consider as DSLRs come with a wide range of megapixel ratings. Megapixels come into play as you consider how you’ll use your images. If you’re looking to print enlargements then more can be good – if you’re just going to print in small sizes or use them for e-mailing friends then it’s not so crucial.
-DSLRs are all more sizeable than compact point and shoot cameras but there is a fair bit of variation in size between them also. Some photographers don’t mind carrying around weighty gear but if you’re going to use it for on the goo photography (travel, bushwalking etc) then small and light models can be very handy.
5). DSLRs SENSOR SIZE
-Another related question to consider is how big the image sensor is. The term ‘crop factor’ comes up when you talk about image sensor size. In general a larger sensor has some advantages over a smaller one (although there are costs too).
6). DSLRs FUTURE UPGRADES
-Will you be in a position to upgrade your camera again in the foreseeable future? While entry level DSLRs are attractively priced they tend to date more quickly than higher end models and you run the risk of growing out of them as your expertise grows and you thirst for more professional features. Ask yourself some questions about your current level of expertise in photography and whether you’re the type of person who learns how to master something and then wants to go to a higher model that gives you more control and features. It’s a difficult question buy you might find it’s worthwhile to pay a little more in the short term for a model that you can grow into.
7). DSLRs PREVIOUS GEAR
- The attractive thing about DSLRs is that in many cases they are compatible with some of the gear you might already have.
· This is particularly the case for lenses. The chances are that if you have a film SLR that your lenses might well be compatible with a DSLR made by the same manufacturer. Don’t assume that all lenses will be compatible (particularly older gear) but it’s well worth asking the question as it could save you considerable money.
· If you have a point and shoot camera you might also want to look at the type of memory card that it takes as some models of DSLRs could also be compatible with them. This probably won’t be a major consideration as memory cards are considerably cheaper than they used to be but it could be a factor to consider.
8). OTHER FEATURES
Most DSLRs have a large array of features that will probably overwhelm and confuse you at first as you compare them with one another. All have basic features like the ability to use aperture and shutter priority, auto or manual focus etc but there’s also a lot of variation in what is or isn’t offered. Here are some of the more common features that you might want to consider:
v Maximum Shutter Speed
-Most DSLRs will have a decent range of speeds available to you but some will have some pretty impressive top speeds which will be very useful if you’re into sports or action photography.
v ISO Ratings
-Similarly, most DSLRs will offer a good range of ISO settings but some take it to the next level which is useful in low light photography.
v Burst Mode
-The ability to shoot a burst of images quickly by just holding down the shutter release – great for sports and action photography. DSLRs vary both in the number of frames that they can shoot per second as well as how many images they can shoot in a single burst.
v Anti Shake
-One of the features that is featuring more and more in them is anti shake technology. While it’s been common to get ‘image stabilisation’ technology in lenses the idea of it being built into camera bodies is something that is attractive.
v LCD Size
-It’s amazing how much difference half an inch can make when viewing images on your cameras LCD. I noticed this recently when testing a camera with a 2.5 inch screen after using my own 1.8 inch one. While it might not change the way shoot photos (people tend to use viewfinders at this level to frame shots) it certainly can be nice to view your shots on a larger screen.
v Semi-Auto Modes
-As with point and hoot cameras - many DSLRs (especially lower end ones) come with an array of shooting modes. These generally include ‘portrait’, ‘sports’, ‘night’, sunset’s etc. If you rely upon these modes on your point and shoot you may well use them on your DSLR too. Higher end DSLRs often don’t have them.
v Dust Protection
-Another feature that has started appearing in the latest round of cameras is image sensor dust protection (and in some cases self cleaning for image sensors) – something that will help alleviate a lot of frustration that many DSLR photographers have. To this point this is a feature that is mainly on lower end DSLRs but it’s bound to appear on new professional models also.
-Generally professional grade DSLRs don’t offer built in flash and just have a hotshoe while entry level DSLRs include a built in flash.
-Getting photos out of your DSLR and into a computer or printer generally happens these days via USB but some people like FireWire and / or Wireless.
I’M CONCLUDE HERE WHY WE NEED DSLRs CAMERAS
(Education, Communication & Preservation Technique)
Cliches are clichés because everyone has heard them before. A picture is worth a thousand words. Photos and videos taken with cameras are used to communicate, to tell stories. The camera was and is a tool or war, used to capture events or people. It is also a tool of everyday lives—just browse an album on Instagram, Facebook, Wechat, Whatsapp and you’ll have “read” a kind of story.
Some people learn by hearing, others by writing, some by seeing. The camera has added a new dimension to education, allowing photographs and video to become learning tools. Imagine a medical school textbook without photographs. Learning takes on a whole new dimension when a student can visualize the medium.
The camera helps to create and preserve memories of historical and / or sentimental value. Famous photographs or notable moments and events from history were made possible by the camera. Every day babies are born, people get married, and all of it is documented with cameras, a source of helping us remember our past. The camera is a valuable source to preserve history.
Thank you for your reading.
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@ Jackie San