Ultraviolet fluorescence is a mechanism in which UV radiation excites chemicals in an object and causes them to release visible light. There are many household objects which fluoresce, such as some washing detergents (anything that ‘makes your whites whiter), soda water (it contains a chemical called quinine which makes it taste bitter, and also causes the fluorescence), the dyes found in highlighters, the bacteria found on the face (which cause spots and acne), bodily fluids (including urine) and much more. Read more…
French photographer Serge Ramelli made this short 30-minute tutorial that teaches the basics of using Lightroom 4 to post-process your digital photographs. If you’re just getting into using Lightroom and shooting in RAW, it’s a helpful primer that will allow you to hit the ground running.
When photographer Devon Mikale was in high school, he created this lengthy manual for his newspaper class to help others learn how to get started in Photoshop. The high school’s faculty loved it so much that they ended up purchasing it for re-distribution in future classes. Mikale has graciously allowed us to publish the guide here for free.
It’s a lot of images and information, but if you’re just starting out and have been overwhelmed by all the different things you need to learn, this guide will walk you through the fundamentals. Read more…
When these three elements are combined, they represent a given exposure value (EV) for a given setting. Any change in any one of the three elements will have a measurable and specific impact on how the remaining two elements react to expose the film frame or image sensor and how the image ultimately looks. For example, if you increase the f-stop, you decrease the size of the lens’ diaphragm thus reducing the amount of light hitting the image sensor, but also increasing the DOF (depth of field) in the final image. Reducing the shutter speed affects how motion is captured, in that this can cause the background or subject to become blurry. However, reducing shutter speed (keeping the shutter open longer) also increases the amount of light hitting the image sensor, so everything is brighter. Increasing the ISO, allows for shooting in lower light situations, but you increase the amount of digital noise inherent in the photo. It is impossible to make an independent change in one of the elements and not obtain an opposite effect in how the other elements affect the image, and ultimately change the EV.
If you’re just starting out in photography, do yourself a favor and work through the Photography Basics page over on Exposure Guide. It’s a fantastic resource.
Looking for free lessons on how to get started with using Adobe Photoshop and Lightroom to post-process your photographs? Look no further than the official YouTube channel of New York City camera shop B&H Photo Video. The store often invites well-known professional photographers to hold lectures on subjects they’re knowledgable in and passionate about. The collection of videos aren’t as shared as other shorter tutorial videos you’ll find online due to their great lengths — they run up to two hours each — but they’re fantastic resources for learning the ins and outs of photography.
In the video above, photographer Tim Grey offers an overview of using Photoshop CS6 for optimizing your photos. His topics include adjustment layers, image cleanup tools, cropping, rotating, correcting perspective, and applying local adjustments. Read more…
Want to learn more about your Canon DSLR without leaving the comfort of its LCD screen? Canon has a series of “on-camera tutorials” that you can load and watch on most of its latest DSLR models. The video tutorials, which cover everything from AF modes to multiple exposure shooting, are meant to be loaded onto memory cards and viewed on-the-go using your camera itself. To find your camera’s tutorials, find and click its model on this products page, and then select “On-Camera Tutorials” at the top. Be warned though: the downloads weigh in at over 150MB each.
Here’s a helpful video that attempts to demystify the concept of DSLR sensor sizes. If you’ve never been able to understand how sensor size (and its crop factor) affects resulting photographs, this video will help.