Understanding Camera Lenses Mm - Nikon Digital Slr Camera Prices - Usb Web Camera 2.0.

Understanding Camera Lenses Mm

understanding camera lenses mm

    camera lenses
  • (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

  • (camera lens) a lens that focuses the image in a camera

  • Sympathetically aware of other people's feelings; tolerant and forgiving

  • the cognitive condition of someone who understands; "he has virtually no understanding of social cause and effect"

  • characterized by understanding based on comprehension and discernment and empathy; "an understanding friend"

  • Having insight or good judgment

  • agreement: the statement (oral or written) of an exchange of promises; "they had an agreement that they would not interfere in each other's business"; "there was an understanding between management and the workers"

  • Millimeter(s)

  • millimeter: a metric unit of length equal to one thousandth of a meter

  • .mm is the Internet country code top-level domain (ccTLD) for Burma (now officially the Union of Myanmar). It was assigned in 1997. Prior to 1989, the ISO 3166-1 code for Burma was BU, but no .bu ccTLD was ever assigned.

  • A computer virus is a computer program that can copy itselfDr. Solomon's Virus Encyclopedia, 1995, ISBN 1897661002, Abstract at http://vx.netlux.org/lib/aas10.html and infect a computer.

My Glass...

My Glass...

I am enthusiastic (maybe to the point of being anal) about the quality of images my cameras and I produce. – Because they can hold timeless moments that are many times captured in one shot. I have had a measure of success in my progression of DX format DSLR imaging systems because I am a stickler for understanding the technical specifications of the systems, and then being able to capture and create what I want from that technical knowledge in the field (did I mention I am a systems engineer – which is probably the reason why I am so particular about digital imaging :-).

Even though there are numerous easy to use features and automatic settings available on the Nikon D5100 – I have always been in the habit of shooting with manual settings (I do use auto focus – except at night because it can be difficult for the sensor to capture a focus point in low light). This provides me a level of control for what I want to capture in landscapes, portraits, macros, and night shots – as opposed to hoping the automatic setting of my camera will produce a quality image.

Something I took the time to do is learn how to pick a lens that is compatible with my cameras. There is no doubt that my Nikon D5100 was created to satisfy user concerns myself and other previous owners of the D5000 observed. The design, functional and innovative modifications from the D5000 to the D5100 were done quite nicely, I must say. Many lenses can be used with Nikon DSLR D5100 cameras. Nikon and Nikon ‘purists’ say that Nikkor lenses produce the ‘best imaging quality’ - more so with Nikon to insure a greater share of the optics market for their DSLR cameras. I can challenge the ‘best imaging quality’ presented by Nikon and Nikkor ‘purists’ in the images I have produced by less expensive (but equitable quality) Sigma and Tamron lenses.

With the popularity of the small sensor APS-c format found in the D5100 and other recent design Nikon DX format cameras, the standard ‘kit’ lens is often supplied at a very attractive price. I, however, use Tamron 10-24mm , Nikkor 35mm prime, Sigma 18-50mm and 50-200mm, and Tamron 70-300mm lenses. I am particularly fond of my Sigma 18-50mm F2.8-4.5 OS HSM (OS = Optical Stabilization, HSM = Hyper-Sonic Motor) - which provides a high level of optical performance.

Unfortunately, I discovered the 18-55mm Nikkor ‘kit’ lens provided with my D40 camera was lacking in features and in image quality. I took a photographer’s prerogative to replace the Nikkor 18-55mm lens with the Sigma 18-50mm ‘standard’ zoom lens when I purchased a D5000. This lens has 16 elements in 12 groups, with aspherical glass to offer correction for distortion, in addition to SLD (Special Low Dispersion) glass which provides optimum color correction and sharpness. The Super Multi-Layer lens coating reduces flare and ghosting and assures high image quality throughout the entire zoom range for me. This lens employs Sigma’s state of the art technology to assure top quality images at a value price.

Along with the large aperture of F2.8, the Sigma 18-50 mm has an almost 3 to 1 zoom range, this compact lens is great for the manual setting shots I take, as well as quick snap shots on the fly. Also, because the lens has an f/2.8 aperture, this lens is capable of ‘fast’ photography - meaning it can be used hand held effectively in low light, helping to eliminate blur from photos with the OS feature (but use of a tripod in low light is my preference).

The design incorporates both glass-mold and hybrid aspherical lens technology that offers superior peripheral brightness, extreme high image quality as well as a compact and lightweight construction. Another feature of my Sigma lens is the super multi-layer coating that reduces flare and ghosting which is a common problem with digital cameras. A high quality image is assured throughout the entire zoom range. In addition, an inner focusing system eliminates front lens rotation making the lens suitable for circular polarizing filters.

The Sigma 18-50mm is my ‘workhorse’ – the one that I will usually have mounted on my D5100. I may choose to mount my 10-24mm, 35mm, or 50-200mm lenses on the D5100 on occasion – but I prefer to use the D3100 for optional mounting of these lenses to catch a different focal length perspective if needed.

And finally: the glass in most lenses are of very good quality, although the final shape of a lens and the mechanisms surrounding it will vary by manufacturer. My former D40 and D5000, as well as my current D3100 and D5100 do not have a auto focus motor, so I have purchased lenses with a built in focus motor..

The image above was taken during one of my daughter’s recent dance recitals (19-MAY-2011)- it is a good example of the hand held ‘fast’ capability of my Sigma 18-50mm F2.8-4.5 OS HSM lens…

Image Spec. Data...

Camera: Nikon D5000
Lens: Sigma 18-50mm f/2.8-4.5
Exposure Mode: Manual
Focal Length: 50mm
Aperture: f/4.5
Shutter Speed: 1/250 second
ISO: 2000
Exposure Bias: -

DAY 246

DAY 246

Today is a very special day. Today is like a transition point. Old camera shoots new camera.

This is my last shot with my loyal EOS 5D. Not that it's dead, actually it works better than ever.
But the time has come for me to get a more powerfull camera.

I always wanted to learn photography step by step. Buying the latest camera with the best lenses or whatever and not knowing how to use it well ? What's the point ? Bullshit.
If you want to learn something, i think it's better to start with something not too complicated, and make it evolve. Unless you're rich, then i guess you can buy the best equipment ever and feel the comfort zone for years.

So i started photography with an old Olympus-C740 or something like that (2 megapixels camera, crazy stuff !), perfect to learn how to frame.

Then i had a jump into the SLR world, starting with a 350D for about 3 years. I learned how to expose, how to shoot with Aperture/speed and how important were the lenses (now, i can understand why buying a 1500$ lense does make sense). Learning to shoot and develop RAW files.

Next step was the Full Frame sensor, 24x36 with the amazing EOS 5D (bought in february 2009), gray market.
I had difficulties to handle the baby at first, but few weeks later, Mr 5D and I were the perfect couple. Well, turned out into a threesome with baby lense Tamron 28-75 f/2.8 (best lense ever if you can't afford a L lense) and the incredible 50 mm f/1.8 (best prime lense ever. Period). This whole 365 is 90% made with the 5D and the Tamron or the Canon 50. I learned more than ever with the body and the lenses, how to expose, shoot manual, front focus, camera metering and exposure, etc.

And now, i think i learned how photography works (and i saved money enough for the past monthes). Well, not to say that i'm done learning. Hell no. You never stop learning, hopefully. But for the first time, i'm facing the limitations of the EOS 5D (especially because of the noise in high ISO). I know the camera by heart, but it's not enough today for what i want to do.

So, i'm pretty happy to welcome EOS 5D MARK II with EF 24-105 L f/4 in the family.

Bye bye EOS 5D
Welcome EOS 5D MARK II

(that was a long speech, but the camera deserved it)
(and hello to Marc Josse who sold me the kit)
(sorry for bad english)
(and i'm done.... NOW.)

understanding camera lenses mm

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