Camera Lens Focal Length Explained. Nikon D5000 Camera Lenses. Cheap Camera Tripod.

Camera Lens Focal Length Explained

camera lens focal length explained
    focal length
  • The focal length of an optical system is a measure of how strongly the system converges (focuses) or diverges (defocuses) light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus.
  • The pinhole camera model describes the mathematical relationship between the coordinates of a 3D point and its projection onto the image plane of an ideal pinhole camera, where the camera aperture is described as a point and no lenses are used to focus light.
  • The distance between the center of a lens or curved mirror and its focus
  • The equivalent distance in a compound lens or telescope
  • focal distance: the distance from a lens to its focus
    camera lens
  • A camera lens (also known as photographic lens, objective lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically
  • a lens that focuses the image in a camera
  • Make (an idea, situation, or problem) clear to someone by describing it in more detail or revealing relevant facts or ideas
  • Account for (an action or event) by giving a reason as excuse or justification
  • An explanation is a set of statements constructed to describe a set of facts which clarifies the causes, , and consequences of those facts.
  • (explaining) The process of making something clear. (ch 16) (584)
  • Minimize the significance of an embarrassing fact or action by giving an excuse or justification
camera lens focal length explained - Know Your
Know Your Bible: All 66 Books Explained and Applied (VALUE BOOKS)
Know Your Bible: All 66 Books Explained and Applied (VALUE BOOKS)
Know Your Bible is a concise, easy-to-understand guide to God's Word-giving you a helpful and memorable overview of all 66 books. For each Know Your Bible provides data on the author and time frame, a ten-word synopsis, a longer (50-100 word) summary, thoughts on what makes the book unique or unusual, a listing of key verses, and a "So, What?" section of practical application. It's a fantastic resource for individuals and ministries!

Know Your Bible is a concise, easy-to-understand guide to God's Word-giving you a helpful and memorable overview of all 66 books. For each Know Your Bible provides data on the author and time frame, a ten-word synopsis, a longer (50-100 word) summary, thoughts on what makes the book unique or unusual, a listing of key verses, and a "So, What?" section of practical application. It's a fantastic resource for individuals and ministries!

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Plus Ça Change
Plus Ça Change
Six months after dropping my beloved Nikon D70 and 18-70mm kit lens, I have finally arranged a replacement. I’m not one for the latest gadgets and gizmos, so I was quite upset that my trusty(ish) companion had finally bitten the dust. It has taken this long to get the replacement sorted as I just couldn’t decide what to do. I could have bought a second hand D70 and lens for about ?200 on eBay, but having already forked out a couple of hundred pounds on running repairs to the shoddy internals of my own kit, I was a bit wary about what I might be buying. Another option would be to claim for a repair or replacement on my home contents insurance, which is something I am not entirely comfortable with. I know I pay the premiums every month, and I’ve never had to make a claim before, but I felt like one of those cheats who routinely break their valuable electronic goods in order to secure the latest models without having to fork out for them. In the end, I could put it off no more. Much as I love my Ricoh GRDII, it does restrict you to a 28mm (35mm equivalent) focal length, and I was missing my circular polariser; I was getting frustrated! I called up my insurance company, and sheepishly explained what had happened. At first, they told me it wasn’t covered, but after speaking to somebody who knew their arse from their elbow, they conceded that it bloody well was, and that somebody from their “technology partner” would be in touch in a couple of days to take the claim forward. Two weeks later, and without a peep from this company, I decided to call them myself; my insurance company hadn’t passed on the claim. After another couple of phone calls, I ended up on the phone to the “technology partner”, who said they’d be more than happy to replace my camera with a brand-spanking new one. Happy days! Not particularly. They were offering me a Nikon D5100 Kit, with the 18-55mm lens. I looked up what one of these was, and decided that it wasn’t what you would call a like-for-like replacement. “It only goes to 55mm” I told their employee. “Let me pop you on hold for a few moments”. A few moments later, she told me that they would be willing to ship an 18-105mm lens in addition to the kit, to make up for the lack of reach. “But the D5100 is not the same class of camera as a D70!” I complained. “Well, looking at the specifications, the D5100 is a much higher spec camera to the D70”. She wouldn’t budge, despite my protestations about the lack of second control wheel and how it wouldn’t be compatible with my flash (which might not actually be true). After being on the phone for over an hour, she was wearing me down, and I accepted their offer. About an hour later, I realised that what they were offering me would cost the same price as the proper direct replacement; the Nikon D90 Kit. I phoned up, and the bloke on the end of the phone this time was much more sympathetic; two days later, this little beauty turned up. It might sound like I was being a bit of a diva, but how can you live without dual control wheels once you’ve had them for the previous six years? I only ever shoot in Manual mode, and having to mess about with buttons is just not cricket in my book. You might say that the D90 has been replaced, so why would I want one? “Proven technology” is the answer. I always have trouble with electronics that are new to the market, whoever makes them. My early D70 was a bag of shite when I got it, after all. I’ve not used the D90 yet, as I’ll need some SD cards to replace the CF ones I used with the D70, but blimey, the autofocus seems fast, and really quiet too; things have moved on, it would seem! On an aesthetic level, I’m not sure I like the design of the body. Not only is it much smaller than the D70, but it’s not quite as elegant either; check out the shape of the top of the pop-up flash unit in the photo. No, you’re right, it doesn’t really matter, does it? If you’re wondering where my photos are, I decided to take them all down. I was going through my photostream for the first time in a long time, and decided that most of them were rubbish. I’m working on them at the moment, tweaking and sorting, and hopefully some of the ones I like will be back up soon. I also decided to quit the 365 thing, as I frequently found myself rushing to take photos at 23:45, and the results were not surprisingly disappointing. So I’ve invested in some new photography books, and I’m spending my time studying them before I start uploading new shots to Flickr. Fingers crossed, some of it will sink in. See you all soon, hopefully.
One term that you’re certain to come across when researching your next DSLR purchase is ‘Crop Factor’. This is a slightly complex topic and many long article have been written explaining it - but to keep it simple let me attempt a short explanation. While normal film cameras take 35mm film (it is a standard for the industry) there is much variety between manufacturers on image sensor sizes. The main reference point that people therefore use is the 35mm one which is considered ‘full frame’ size. If you compare the size of the film in a normal SLR (film is 35mm) to the image sensor in most DSLRs you’ll find that the size of the DSLRs sensor is generally smaller (unless you get what’s called a ‘full frame’ DSLR). Until recently ‘full frame’ cameras were largely in the realm of professional DSLRs and all lower end cameras had smaller sensors. If you take a photo with a smaller sensor and the same lens it will only show a smaller area of the scene. To illustrate this I’ve show how different cameras with different image sizes will see an image. Finding this helpful? Digg This Post Black - Full Frame Red - 1.3x Crop Factor Yellow - 1.5x Crop Factor Green - 1.6x Crop Factor When you enlarge images to the same size from different sensors the ones with the smaller sensors will be enlarged more - making it seem bigger. As a result - when you fit a lens to a camera with a smaller sensor the lens is often said to have a larger equivalent lens size. I’ve included a table below that shows the equivalent lens sizes for different crop factors. The column on th left is the lens focal length on a full frame camera. So what crop factor does your DSLR have? Here’s some of the most popular ones. 1.3x - Canon EOS 1D/1D MkIIN 1.5x - Nikon D40/D50/D70/D70s/D80/D200/D2XD2Hs Minolta 7D/Fuji S3 Pro Pentax *istDS/K100D/K110D/K10D 1.6x - Canon EOS 300D/400D/20D/30D 2.0x - Olympus E-400/E-500/E-300/E-1

camera lens focal length explained
camera lens focal length explained
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