HolaLes dejo info de la Canon t2i 550D (ofrecere la mia en posteo de ventas).Es una excelente camara con un zoom muy versatil (Canon 18-200mm), como para iniciarse y tener para unos cuantos anos. Canon EOS Digital Rebel T2i ReviewCanon's latest EOS Digital Rebel model, the T2i is an entry-level dSLR that offers many of the same features we saw on its predecessor, the T1i. Que bueno Edu,Esta impecable esa camara, y la relacion precio prestacion es excelente.Seguro te la quitan de las manos.Y se puede saber por que maquinon vas !! Visit here (facebook) Leave a comment and have a chance to win the the Waterproof Camera Bag! In this essay, you can enjoy beautiful pictures some photographer have taken while traveling. Beautiful images of deep-space phenomena are by no means beyond your reach as a photographer. My journey into astrophotography started a few years back with a visit to my local Astronomy Society. It may surprise you to learn that you don’t need NASA-style equipment to produce stunning images, and your humble DSLR will easily pull out the faint details of our night sky’s wonders.
As you can see, a single exposure is quite grey and noisy and I have even picked up a satellite passing through, which is pretty common. In the above, I have stacked thirteen 900-second exposures and applied some stretching via levels and curves in my processing software.
An advantage of using a DSLR is that they shoot in colour, meaning you will not need to obtain an image of each separate colour channel, as I do with my full astro setup. I use a mono CCD camera that is specially designed for astrophotography and for running long exposures, so it has both electronic cooling as well as fans, allowing me to cool the imaging chip to -10 to help reduce noise. There are three basic things you need to be able to create images of objects in the night sky. I have added the mount as number one on my list, mainly because I see this as the most crucial element of the setup. There are 3 main types of telescope: refractors, reflectors and catadioptric (folded light), with the optimal scopes for deep-sky imaging being refractors.
Refractors work very much like camera lenses, but consist of generally two or three lens elements whereas a camera lens can contain more than thirteen. Reflector style telescopes can also be used to great success; however these tend to be heavier so will need sturdier mounts.


With regard to cameras, any DSLR from the main manufacturers will be capable of capturing stunning images.
With this setup, the adapter replaces a camera lens, meaning the camera plugs direct into the telescope and the telescope becomes the camera’s lens.
ISO – set the ISO to somewhere around the 400 to 800 mark, depending on how well your camera controls its noise. Exposure length – With astrophotography, the longer the exposure the better, however we are limited by our equipment and ability to polar align. The final piece of the puzzle is a planetarium type software so you know where to look for these objects, however if you get a motorized mount, they will often be ‘go-to’ which means they will take you to the objects you want to view.
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Warehouse Express Limited acts as a credit intermediary offering credit products from a panel of one lender. Before I knew where I was, the parcels started being delivered and the spare room started looking like an astronomy store. The key to astrophotography is combining multiple long exposures to reveal the very faint objects in the sky – the above is a stacked image of thirteen 90-second exposures that have been stacked in a free program called ‘Deep Sky Stacker’, which takes the images, aligns them, and then stacks them together.
At this point the image is not yet complete, so it is only in black & white (my main astro camera shoots in mono and I use special filters to capture the separate colour channels which I then blend together – more on this later). By stacking the images I have cleaned up the grey background, brought out the detail within the galaxy, and even cleaned out the trail from the satellite.
I need to add more time to bring out the dust further, add in the colour data from separate colour channels, and some drop in some shorter exposures to clean up the stars. In general, with a DSLR you will want to obtain around an hour of total exposure time minimum, which will give you some details to work with. The advantage with a mono camera is that you can use specialist filters and rather than capturing visible light, can start to make images in ‘narrowband’ or specific bandwidths of light. Since we live on a little blue ball that is constantly spinning, movement is an issue when we need to run long exposures of the night sky.
One axis of the equatorial mount aligns onto the pole star, which sits directly abo­ve the magnetic pole. The advantage of fewer lenses is better light transmission – the more lenses light has to pass through, the more light can get lost.


Additionally some reflector-style scopes struggle to achieve focus (not enough inwards focus), so it’s always worth doing your research before buying.
Note that this does mean that you will lose the autofocus capabilities of your camera, and focus will have to be achieved via the telescope.
If you believe an article has infringed on your copyright, please contact us and we'll delete or revise it immediately. Well, it’s not just NASA producing these images any more, but enthusiastic amateurs in their back gardens. As I have always had an interest in photography it didn’t take long before I stopped looking through the telescope and started attaching my camera instead. Each exposure contains a certain amount of signal (the object you’re attempting to capture) and noise created by the long exposure. Additionally, by combing the data I have revealed the really faint dust that we are looking through in this area of the sky.
This is fine if you are trying to achieve star trail images, but elongated stars will ruin any deep sky images.
This enables the other axis to rotate in the same arc as the stars, and the motors to ensure they move at the same speed. If you’re using a camera lens thenyou will want to stop down two or three stops to help reduce spherical aberration, coma and astigmatism. Check the image, if the stars are still round, step the exposure length up to 60seconds and so on.
By stacking multiple images, you increase the signal at a greater rate than the noise, thus reducing the amount of noise in the final image. The key though is polar aligning, which once learnt is pretty straight forward, but can take some getting used too.



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