Too much magnification can lead to poor quality images, because the images obtained have an intrinsic resolution limited by:
Where D is the diameter of the instrument in mm. The eyepiece focal length corresponding to the minimum magnification is given by: This rule is not absolute: you can magnify less, but part of the light will be lost and, in the case of a telescope, a kind of black task may appear in the center of the image because of the obstruction of the secondary mirror.
This corresponds to a standard size of opening of the human eye. It is generally considered that it is better to avoid magnifying below the magnification giving an "exit pupil" greater than 6 mm. Note: the focal lengths are deliberately limited to a range of 2.5 to 40 mm, corresponding to those commonly available on the market. The choices offered make it possible to gradually equip themselves up to an "ideal" range of 7 eyepieces well staged and covering all magnifications from one extreme to the other.
#Telescope viewfinder simulator
How does the Stelvision simulator work out the optimized range?ĭepending on the number of eyepieces selected (between 2 and 7), the simulator offers eyepieces to achieve various magnifications, ranging from minimum magnification to The obtained focal length values are rounded to values corresponding to what is usually found on the market.
Each magnification corresponds to an eyepiece focal length, which the simulator calculates for you. You can find astrophotography "how to" tips and share your best astronomy pictures here.It is a range of eyepieces well distributed in magnification. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. And when you're stargazing, Orion's telescope cases and covers, observing gear, red LED flashlights, astronomy books and star charts will make your observing sessions more convenient, comfortable and meaningful.Īt Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Capture breathtaking photos with our affordable astrophotography cameras. Expand your viewing experience with accessories ranging from moon filters to power-boosting Barlow lenses to advanced computerized telescope mounts. Orion's telescope and astrophotography accessories will enhance your telescope enjoyment without breaking the bank. We offer binoculars for every viewing interest, including astronomical binoculars, compact binoculars, waterproof binoculars, birding binoculars, and sport and hunting binoculars. Orion binoculars are known for quality optics at a great price.
#Telescope viewfinder how to
Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.
Because we sell direct, we can offer you tremendous value at a great price. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. Our 100% satisfaction guarantee says it all. Now an employee-owned company, we pride ourselves on an unswerving commitment to best quality products, value and unmatched customer care. Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers.
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