Fwd: Astrophotography Telescopes: Types & Comparisons
RAUL FIGUEIRA
Astrophotography Telescopes: Types & Comparisons
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- Astrophotography Telescopes: Types & Comparisons
- How to Edit and Compile Action Sequence Photography
- Creative Light Painting Photography Examples
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Astrophotography Telescopes: Types & Comparisons Posted: 16 Mar 2013 04:16 PM PDT Quick Reminder: Only a few days left in the popular deal on: Night Landscape Photography As more and more tools become available to the common photographer, astrophotography is beginning to see an increase in popularity. Though the specialized genre of photography still requires some astronomy specific equipment, such as the telescopes we will be discussing in the video below, the initial cost of the hobby is more within the realm of many hobbyists. If you are interested in taking your star photography to the next level, Forrest Tanaka has created an essential guide to astrophotography telescopes in the form of a 30 minute long video tutorial. Take a look (for those of you reading this by email, the video can be seen here): As Tanaka explains in the video, there are three common types of telescopes used by astrophotographers. They are: Schmidt–Cassegrain, Newtonian, and refractor. Newtonians are most popular, especially among novice photographers because they are generally lower priced and are still capable of producing quality images. But, take note that Newtonian telescopes don’t come without their own issues. Often, they will require modification and sometimes cause undesirable visual side effects, namely around the edges of the images. Using a crop sensor camera can help combat this, however. When shopping for a refractor telescope, Tanaka recommends looking for one that offers:
 Note the chromatic aberration on the bottom, right side of the moon. Cassegrain telescopes are also a popular telescope, though slightly pricier. Cassegrain generally have longer focal lengths, despite being the shortest of the telescopes. The shortness is helpful when mounting a camera to to it, because it is not as vulnerable to bending from the weight of a DSLR. A Cassegrain will produce cleaner star images, since they eliminate the tails, or comas, that Newtonian telescopes often create on stars.  The tails on the stars are an undesirable effect of Newtonian telescopes referred to as comas. The final of telescope, the refractor, are quite expensive and because so are generally used by those astrophysicists and very serious amateurs. Refractors offer nice contrast to planetary photographers, because there is no mirror blocking the light. Refractors are excellent choices when photographing the sun or planets, as they really allow shadows and cloud shading on the planetary surfaces to show.
For Further Training on Compositions with Stars:This popular guide is designed to be straightforward enough for beginners to night photography, or for extremely experienced night specialists to get the most from those more challenging situations. Single and Multiple Frame techniques are covered in detail, including using Graduated Neutral Density Filters at night, the Magic Glove Technique, and of course, stacking star trails (list of more topics). We contacted the publisher who agreed to throw in a bonus intro book for our readers until Thursday. It can be found here: Night Landscape Photography Guide Go to full article: Astrophotography Telescopes: Types & Comparisons
  
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How to Edit and Compile Action Sequence Photography Posted: 16 Mar 2013 01:41 PM PDT Photoshop lets us do a lot of cool things. The only problem is trying to figure out how to do them. In this tutorial video, Pete Webb shows how to use Perfect Layers to build an action sequence composite. The same method applies for Photoshop and can be used on just about an photo you wish to build from multiple images (for those reading this by email, the video can be seen here): Webb does a great job of showing how to carefully brush around layers to form a composite image, but in this video he doesn’t go into a lot of detail about how you should shoot the image. So in addition to Webb’s editing tutorial, here’s a few tips on shooting your image:
 Use brush in and brush out tools to get rid of excess background detail  Final image of action sequence Go to full article: How to Edit and Compile Action Sequence Photography
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Creative Light Painting Photography Examples Posted: 16 Mar 2013 11:24 AM PDT In this video from Brady Bigalike of Noble Light Productions, we revisit the topic of light painting – a technique where the photographer uses light sources such as flashlights, LEDs, flames, and any other illuminating device to paint an image onto an exposing photograph. Sometimes these paintings are done entirely in this fashion, with light streaks forming entire murals on an otherwise pitch black environment; in this video, the artists integrate their creative shapes with existing scenes to foster a marriage of reality and imagination (for those reading this by email, the video can be seen here): The principles of light painting are simple: focused on a dark scene, you set up your camera on a tripod with the aperture closed down all the way and the ISO set to its lowest sensitivity (100 ISO on most cameras). You’re looking to get exposures of at least a minute or more – longer exposures will allow you to create larger and more intricate designs. Since most cameras’ shutter speed settings don’t time this high, you’ll need to set your shutter speed to bulb mode and attach a wired remote with a shutter lock, then time the exposure yourself with a stopwatch. If you’re finding that the light is still too bright for such long exposures, consider a neutral density filter.
You’ll want to dress all in black and move quickly, so that you don’t show up in the image – unless that’s what you’re going for. With the camera exposing, use your various light sources to create shapes and patterns around your scene, being careful to always stay behind the light and never get between it and the camera. Experiment with different types of toreches and notice the different shapes, sizes, and colours given by each. Use flashlights and external flashes to illuminate objects around you, or point them straight at the camera for streaks and points of light. Cover your lights with coloured gels to add bright and vivid hues. Get creative and try as many different things as you can think of!
With these techniques you can bring the medium of photography into the realm of the surreal and fantastic in a completely organic way, without the use of computer-based manipulation. Light painting is a wonderful way to get acquainted with the substance that makes a photographic image – photons are our oils, our clay, our musical notes, and they can be bent and shifted and played with in amazing and unexpected ways. Understanding the behaviour of light is integral to becoming a great photographer, and light painting is one of the most active and fun experiences of learning there is. The most important part, though, is to just have fun with it – the enthusiasm will shine through in your finished product. Resources for Further Training:For further training on long exposures, we have an exclusive deal this week on a Night Landscape Photography Guide. However, another resource more focused on light painting is the very popular Trick Photography and Special Effects. Go to full article: Creative Light Painting Photography Examples
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UFRJ / Palestrante SBPC
Raul Figueira
Físico
SKYPE: raulfigueira3270
raulfi...@globo.com