background preloader

Understanding Camera Lenses

Understanding Camera Lenses
Understanding camera lenses can help add more creative control to digital photography. Choosing the right lens for the task can become a complex trade-off between cost, size, weight, lens speed and image quality. This tutorial aims to improve understanding by providing an introductory overview of concepts relating to image quality, focal length, perspective, prime vs. zoom lenses and aperture or f-number. All but the simplest cameras contain lenses which are actually comprised of several "lens elements." Each of these elements directs the path of light rays to recreate the image as accurately as possible on the digital sensor. The goal is to minimize aberrations, while still utilizing the fewest and least expensive elements. Optical aberrations occur when points in the image do not translate back onto single points after passing through the lens — causing image blurring, reduced contrast or misalignment of colors (chromatic aberration). Original Image ZOOM LENSES vs.

http://www.cambridgeincolour.com/tutorials/camera-lenses.htm

Related:  ArtCamera Functions

Patiently Arranged Dandelion Works by Botanical Artist Duy Anh Nhan Duc All images via Duy Anh Nhan Duc Self-taught botanical artist Duy Anh Nhan Duc uses a steady hand to arrange dandelion blossoms in artful imitations of their flight through the air. His monochrome works are each reminiscent of a universal childhood urge to scatter a dandelion’s seedlings with a single blow, eager to watch the feathery pieces take flight in the wind.

Understanding Camera Lens Flare Lens flare is created when non-image forming light enters the lens and subsequently hits the camera's film or digital sensor. This often appears as a characteristic polygonal shape, with sides which depend on the shape of the lens diaphragm. It can lower the overall contrast of a photograph significantly and is often an undesired artifact, however some types of flare may actually enhance the artistic meaning of a photo.

How to Take Better Pictures © 1973 ~ 2016 Ken Rockwell and KenRockwell.com. All rights reserved. Cameras & Lens Reviews Recommended Cameras Newest Articles Recommended Books Tutorial Videos Newest Articles Hyperfocal focusing: how to calculate the best distance to focus at Knowing how to calculate hyperfocal distance isn’t actually as complex as its technical name implies, but mastering this important photography technique can make all the difference to your photography. Here we answer all of the common questions photographers have about hyperfocal focusing. Images by Marcus Hawkins. Click on the infographic to expand. Canon Philippines drops the price on the EOS 1100D, offers more bundle options Canon’s entry level DSLR just became a lot more affordable. The Canon EOS 1100D will be getting a price drop staring today (October 20, 2011), from Php 31,950 to Php 29,998. That’s a substantial saving of Php 1,952. In conjunction with the EOS 1100D price drop, Canon will also be offering a few new DSLR bundles that are targeted at the entry level market. Here’s the full price list for your perusal. Canon EOS 1100D 18-55mm lens kit Freebies: 8 GB SD Card, Tamrac Camera Strap, Photography book and 3 years warranty Price: Php 29,998

5 DAY CREATIVE TEXTILE COURSE: FLAX PROCESSING, SPINNING, WEAVING AND NATURAL DYING « Selvedge Join textile artist Susie Gillespie and learn how to process, spin, weave and naturally dye linen. Susie will pick your flax from her orchard in August (2016) so it has time to dry. But don’t worry, she’ll talk you through the process of planting the seeds, rippling and retting the stems so they are ready to be spun. You’ll start by making preparations to the flax stems to prepare them for spinning, this will include revealing the flax fibres, removing the pith, combing them and finally winding them so you can tease off the fibre to produce the yarn. Once you have a hank of your own linen you can experiment with a range of natural dyes or keep the linen in its natural state. Composition: Using the Rule of Thirds The rule of thirds is a powerful compositional technique for making photos more interesting and dynamic. It's also perhaps one of the most well known. This article uses examples to demonstrate why the rule works, when it's ok to break the rule, and how to make the most of it to improve your photography. The rule of thirds states than an image is most pleasing when its subjects or regions are composed along imaginary lines which divide the image into thirds — both vertically and horizontally: Rule of Thirds Composition Region Divided Into Thirds

Camera Exposure: Aperture, ISO & Shutter Speed A photograph's exposure determines how light or dark an image will appear when it's been captured by your camera. Believe it or not, this is determined by just three camera settings: aperture, ISO and shutter speed (the "exposure triangle"). Mastering their use is an essential part of developing an intuition for photography. Achieving the correct exposure is a lot like collecting rain in a bucket.

Canon EF 50mm F1.8 II Lens Review: 1. Introduction The Canon EF 50mm F1.8 II is the least expensive lens currently available for the EOS system, and has been in the lineup since late 1990. It's a simplified version of the original EF 50mm F1.8 of 1987 (often referred to as the 'Mark I') which was supplied as standard with some of Canon's earliest 35mm EOS SLRs; however it can trace its lineage back a lot further than that, as the company has been making 50mm F1.8 standard lenses since 1959. Like its predecessor, it uses simple symmetric Gaussian optics with six elements in five groups, in a well-proven formula which is known to offer excellent correction of aberrations.

Pioneering Painter Alma Thomas Is Making a Comeback 30 Years after Her Last Major Retrospective In 1972, at age 80, Alma Thomas was the first African-American woman to receive a solo exhibition at the Whitney Museum. Interviewed that same year by The New York Times, the artist, who grew up in Columbus, Georgia, before settling in Washington, D.C., said: “One of the things we couldn’t do was go into museums, let alone think of hanging our pictures there. My, times have changed. Just look at me now.” Thomas, who achieved widespread recognition late in her lifetime for her colorful, exuberant abstract paintings, is once again in the spotlight after slipping from the mainstream art-historical canon following her death in 1978.

Compact vs. Digital SLR Cameras Choosing between a compact (or "point and shoot") and a digital SLR camera is often the first big purchasing decision when starting out with photography. Not only is it potentially a big financial decision, but it may also determine what kinds of shots you'll be capable of capturing. This tutorial cuts through all the marketing hype in order to highlight only the most important differences between each camera type — thereby helping you to decide which one is best for you and your shooting style. What exactly does it mean for a camera to be a compact (or point and shoot) versus an SLR? Strictly speaking, SLR cameras just have viewfinders that see the same light as the camera's sensor (more on this later), but in practice this isn't the only distinction.

Related:  surveillance