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Focal Reducer
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How does a focal reducer effect the focal length of a telescope and therefore the mag power?
I have a 16" telescope with a focal length of 4064 mm. My reducer is a 6.3. Now I know that I have an F10 and with the reducer it gets knocked down to an F6.3 but what happens to the actual focal length of the telescope. Hopefully someone out there can help.
Hey guys thanks for your input and your experience. I was pretty sure I understood the process but that is what makes yahoo answers cool. You all had great responses. I thank you.The reducer changes the apparent focal length of the telescope, but from the perspective at the eyepiece it doesn't matter what the "actual" focal length is--that's just a physical number that is pretty much irrelevant to your observing or your photography. The magnification power and the focal length are reduced by a factor of .63, and your brightness is increased accordingly, exactly as if your telescope "really" were an f-6.3. So focal length is 4064*0.63.
I don't know if you are asking anything more than just that, but in case you are wondering about whether there is a difference between "actual" focal length and calculated focal length, I'd say that if you have a catadioptric scope (Schmidt or Maksutov), there is no "actual" focal length of your telescope. Sounds like maybe you have a Schmidt if you have a 16" f-10 and a matching .63 reducer? With a Schmidt, your focal length of the primary mirror is actually something more likd f-2, but the secondary mirror acts as a focal length increaser that brings it up to f-10. So you could actually correctly state that you "actually" have an f-2, but that is meaningless because when you look through the eyepiece or take a picture, you get the equivalent of an f-10. So if you take a Schmidt with an f-2 primary, 5x focal increaser secondary and then add a .63x decreaser lens in the front, it's meaningless to argue whether your scope is "actually" an f-2, and f-10, or an f-6.3. The only thing that matters is the physics of the light at the end, and that light acts like it's coming through an f-6.3, so that's all you need to worry about.
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Vixen Optics Focal Reducer ED8S ED103S and ED115S 3666
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Pentax K-7 with Celestron 9.25 and F6.3 focal reducer (1480mm F6.3) in 1536x1024 *** HD video mode
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Article Referencing Focal Reducer
Spotlighting is used to project a beam of light to the interesting objects such as statuaries, trees, buildings or shrubberies. Spotlights are an effective way of turning an entrance way, statue or walkway into the focal point of your home. The effect is particularly compelling if used to highlight features that have natural movement, such as fountains. This technique uses focused and typically more intense light sources.
Spotlighting is perfect for seed starting, cuttings, transplants or helping for special houseplants in the winter. A low-voltage pin spotlight is used to illuminate a garden pond and waterfall under an exterior wall. Spotlights can be bet into the ground or mounted to standard outdoor fixture boxes for installations on walls, trees or posts.
Spotlights are well suited for applications requiring a high degree of contrast on non-reflective objects. The lighting should not be overpowering but rather subtle and used in conjunction with other lighting. This light has been painted green to help it blend in during daylight hours. Position the beam of light for a long distance from the subject you want it to illuminate and arrange it so that it lights up just a part of your subject, such as a statue, which will make it more atmospheric.
Spotlighting used sparingly can pick out larger plants and architectural features, this technique can produce a very dramatic effect. Spotlighting is used to highlight certain areas by directing an intense beam of light onto an object or garden feature. It is best used with a mix of other lights to reduce glare. Individual features are powerful illuminated from above or below by a strong, narrow- focused beam of light. A flexible on-axis light source, spotlights can be used in place of other light types, or the LEDs can be aimed to create specific custom patterns, such as creating two separate areas of illumination. More complex inspections might require multiple spotlights to create a range of effects.
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Robert Is A Freelance Writer For Gardenlightz.com. They Specialize In Information About All Kinds Of Garden home Lighting. No Matter What Kind Of Garden lighting You Are Looking For You Can Find Information on Garden Lighting, Outdoor Lighting and much much more Here.
Article Source: ArticlesBase.com - Spot Lights Emphasize Focal Points of your Garden
Published on November 3, 2005 · Filed under: Binoculars; Tagged as: focal reducer astrophotography, focal reducer calculator, focal reducer celestron, focal reducer design, focal reducer dslr, focal reducer newtonian, focal reducer refractor, focal reducer review, focal reducer sct, focal reducers
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