Archive for April, 2010

3153WVF4TJL. SL160  Celestron X CEL Series 1 1/4 12.5mm Eyepiece
Celestron X-CEL Series 1-1/4 12.5mm Eyepiece
Product Description
If you are looking for an eyepiece that excels for planetary viewing, then Celestron's X-Cel offers the unique features you are looking for. A 6-element fully multi-coated optical design, the X-Cel utilizes extra low dispersion (ED) glass on its most highly curved surfaces, to minimize chromatic aberration that can hinder sharp planetary views. With a wide 55° apparent field of view, and a large 25mm clear aperture the X-Cel is one of the most comfortable eyepieces to use. Every X-Cel eyepiece is parfocal with each other, meaning little or no focusing is needed when changing from low to high power. The X-Cel comes with soft rubber eyecups and a durable plastic case. In addition, if you are an eyeglass wearer, you will enjoy the 20mm eye relief available on each of the X-Cel focal lengths. Threaded barrels accept 1-1/4" Celestron thread-in filters.
Celestron X-CEL Series 1-1/4 12.5mm Eyepiece

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What is the magnification of a telescope with an objective of 4000 mm and an eyepiece of 26 mm?

No idea, some pre-lab question, not in textbook, TA said "use the Internet"

 

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I've got 10mm lens and 20mm...
Which one is the best to view smaller planets like Mars and Venus? And how well can I see them?
Thank you

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