Telescope Eyeglasses
Wednesday, July 27th, 2011
What is the focal length of 2.5 diopter eyeglasses?
What is the focal length and what is the formulla to calculate this.
If I want to make “ancient” telescope with eyeglass lens how can I correct for some better no abberation.
The focal length is 400mm because P=1/f so 2.5=1/0.4 so f=1/p and 0.4=1/2.g
For the making of the telescope it must be with achromatic system of lenses.
Scribblenauts: Metro Puzzle Level 2-4
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6mm Orion Long Eye Relief Telescope Eyepiece $99.99 Our 6mm Orion Long Eye Relief telescope eyepiece features a luxuriously long 20mm eye relief so you can enjoy the full view with or without eyeglasses on. If you don’t wear glasses while you observe, a supple, pop-down rubber eyeguard helps to position your eye so you take in the entire view. When using the telescope eyepiece while wearing corrective lenses, you can pop the rubber eyeguard down to avoid contact with your glasses. The gorgeous fully multi-coated 1.25″ 6mm eyepiece delivers rich, high-contrast images across a 55° apparent field of view. With seven lens elements in four groups, the 6mm Long Eye Relief eyepiece provides excellent correction so stars stay sharp and bright all the way to the edge of the visible field. In fact, Orion Long Eye Relief eyepieces are more highly corrected than popular Plössl eyepieces. With its relatively short 6mm focal length, this eyepiece will provide a high-power view in most telescopes, perfect for detailed high-magnification views of the planets and Moon. Bright deep-sky objects such as globular clusters and bright compact nebulas also display well in the 6mm Long Eye Relief telescope eyepiece. You can further optimize views through the 1.25″ 6mm eyepiece with any Orion 1.25″ eyepiece filter since its 1.25″ barrel is threaded for filters. |
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9mm Orion Long Eye Relief Telescope Eyepiece $99.99 With its luxuriously long 20mm eye relief, you can keep your glasses on and still see the entire field of view in comfort with our 9mm Orion Long Eye Relief telescope eyepiece. Whether you wear eyeglasses or not when you view the night sky, you’ll appreciate the exquisite optical performance and build quality of our 9mm Orion Long Eye Relief telescope eyepiece. If you prefer to stargaze without corrective lenses on, a supple pop-down rubber eyeguard on the 9mm Long Eye Relief eyepiece helps position your eye properly to comfortably take in the entire view. This exquisite, fully multi-coated 9mm eyepiece delivers rich, high-contrast images across a 55° apparent field of view. The 1.25″ 9mm Orion Long Eye Relief eyepiece provides great correction so stars stay sharp and bright all the way to the edge of the visible field. With seven lens elements in four groups, the 9mm Long Eye Relief telescope eyepiece will astound you with the high-level of quality it has at such an affordable price. The 1.25″ eyepiece’s rather short 9mm focal length provides sharp, clear high-power views ideal for planetary study and views of the Moon. You can enhance your views through this 9mm eyepiece with any 1.25″ Orion eyepiece filter since its barrel is conveniently threaded for filter use. |