 | Images through the eyepiece of my telescope look great. When I hook up my DSLR with a T-ring and T-adapter I can't get a clear picture. What’s wrong? |
 | It's more than likely a focusing issue.In-focus images take work, especially if you are conditioned by autofocus technology in conventional photography. Focusing is always a challenge through long lenses and even more so with most SLRs. Digital |
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| Will the NexImage achieve focus with my Onyx 80EDF? |
| The NexImage CCD camera is relatively compact, much smaller than a DSLR and most other CCD, film and digital cameras. It also has a relatively short nosepiece. The Onyx drawtube’s back travel is approximately 3-1/4”. The combined length is not |
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| What advantages does the Celestron zoom eyepiece #93230 have for SLR (DSLR) photography? |
| A zoom eyepiece allows a wide range of magnifications for visual use.The same advantage is true when using one for photography, where the use of a zoom is a kind of eyepiece or positive projection. This method uses an eyepiece to project an image directly |
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| I want to match the image scale with my DSLR or CCD camera to my scope’s focal length. Why should I do that? How do I increase or reduce my focal length or f/ratio to do that? |
| The basic imaging element of today’s electronic camera is the pixel. It can be thought of as the individual cell or unit on the chip (picture element) that actually captures the light from the sky. The analogy to film imaging is the grain size |
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| What are Fastar and HyperStar? How do they work? |
| Fastar is a system invented by Celestron in the 1990s to quickly and easily convert our Schmidt-Cassegrain telescope (SCT) f/10 optical tube assembly (OTA) into a very short focal length, fast f/2 imager. The Fastar system consists of two parts. One is th |
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| My images with a CCD camera are showing black or white streaks on the brighter stars. They are all bloomed out. What’s wrong with my scope? |
| Nothing is wrong with your scope! It’s the camera.Many CCD cameras and some digital SLRs have a problem with very bright objects in a predominantly dark field. When the charge is read out of the brightly illuminated pixel or pixels on the chip, it c |
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| What is the optimized image circle for the EdgeHD optical tube assembly (OTA)? |
| The EdgeHD optics are designed to optimize an image circle 21mm in radius from the center of the field of view. Doubling this figure gives an image circle 42mm in diameter. This is big enough to take in the diagonal of either a 35mm so-called full frame C |
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| Will I be able to use my standard Celestron SCT T-adapter 93633-A to attach my SLR camera to the EdgeHD? |
| Yes, you can use your standard SCT T-adapter to connect your film or digital SLR to the New EdgeHD optical tube assemblies (OTAs).However, the EdgeHD has been optimized for astrophotography at a specific spacing between the scope and the camera image plan |
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| What is back focus? What problems does it cause for visual and photographic use of my scope? What are related focus issues? |
| Back focus is the distance from the end of your eyepiece drawtube to the focal plane of your telescope. It varies greatly with the type of telescope. Schmidt-Cassegrain telescopes (SCTs) typically have generous back focus distances of approximately 5 |
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| I’m doing photography with an eyepiece, using my camera with and without a lens. What are the f-numbers of my setup for the afocal and eyepiece projection methods? |
| The afocal photographic method uses an eyepiece projecting through the camera’s lens and can be used with fixed lens (point and shoot) as well as removable lens (SLR) cameras.For afocal work the effective f-number is the focal length of the camera l |
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| I’m using a focal reducer and can’t seem to focus my SLR camera on my Schmidt-Cassegrain telescope (SCT). What am I doing wrong? |
| You may not have enough back focus with the focal reducer in place.A focal reducer is an accessory that screws onto the threads on the back of your SCT’s optical tube assembly (OTA) to give a smaller and brighter image at prime focus. It yields lowe |
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| How do I connect a single-lens reflex (SLR) camera to my telescope? |
| To connect an SLR camera to your telescope, you’ll need two accessories: a T-ring and a T-adapter. The T-adapter system is a worldwide standard 42mm thread to connect cameras to other devices.T-adapter system for SLR cameras.A T-adapter attache |
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| How do I use my microscope for photography? |
| There are several ways your microscope can take photos.The first method is to use a microscope T-adapter or tube adapter. These are available in the aftermarket and either will have a nosepiece for the microscope’s eyepiece drawtube, a tube that fit |
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| How do I use my spotting scope for photography-digiscoping? |
| Your spotting scope doubles as a telephoto lens and can be used in several ways to take photographs of terrestrial and even celestial objects.Celestron’s Ultima spotting scopes have a T-adapter built-in to the eyepiece. Just slip off the eyecup to e |
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| Can I use my NexStar SLT telescope for photography? |
| Yes. Your telescope can be used in several ways to take photographs of celestial and even terrestrial objects.The most basic way is to use the telescope as a piggyback mount, so-called because the camera will ride piggyback on the telescope. In this type |
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| Can I use my Omni XLT telescope for photography? |
| Yes. Your telescope can be used in several ways to take photographs of celestial and even terrestrial objects.The most basic way is to use the telescope as a piggyback mount, so-called because the camera will ride piggyback on the telescope. In this type |
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| Can I use my AstroMaster telescope for photography? |
| Yes. Your telescope can be used in several ways to take photographs of celestial and even terrestrial objects.The most basic way is to use the telescope as a piggyback mount, so-called because the camera will ride piggyback on the telescope. In this type |
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| Can I use my PowerSeeker telescope for photography? |
| Yes. Your telescope can be used in several ways to take photographs of celestial and even terrestrial objects.The most basic way is to use the telescope as a piggyback mount, so-called because the camera will ride piggyback on the telescope. In this type |
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| Can I use my NexStar GT - GTL telescope for photography? |
| Yes. Your telescope can be used in several ways to take photographs of celestial and even terrestrial objects. The most basic way is to use the telescope as a piggyback mount, so-called because the camera will ride piggyback on the telescope. In this |
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