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Celestron 5mm X-Cel LX


The Celestron 5mm X-Cel LX eyepiece offers a 60 degree apparent field coupled with a comfortable 16mm eye relief. This eyepiece should prove useful in most telescopes up to about 1500mm focal length. Consult our eyepiece calculator below for specific applications. All X-Cel LX eyepieces feature a twist up eyecup and a no slip rubber grip ring. X-Cel LX eyepieces are parfocal, meaning that little or no focusing is required when switching between focal lengths.


Item #ProductStock StatusPriceShipping
93421Celestron 5mm X-Cel LX
In Stock - Ships Same Day (business days) This is "live" inventory data. If it says in stock, you can believe it.
$69.00
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Optical Specifications: Celestron 5mm X-Cel LX
Focal Length 5 mm
Apparent Field-of-View 60°
Eye Relief 16 mm
Physical Parameters
Barrel Diameter 1.25 Inches
Eyepiece Calculator
Enter at least two of your telescope's specifications:
*Focal Length (mm):
*Aperture (mm):
Focal Ratio (f/):
Magnification:
 
True Field:
 
Exit Pupil: <p>Exit pupil represents the diameter of the column of light exiting the eyepiece. Magnification is simply the ratio of telescope aperture to exit pupil. Fox example, using a telescope with 100mm aperture and an exit pupil of 2mm yields a magnification of 50X.</p> <p>There are both upper and lower limits to the useful range of exit pupils. The typical human eye pupil dilates to a maximum of 7mm when fully dark adapted. This figure decreases with age. Using an exit pupil that is larger than this upper limit simply spills the light onto an area of the eye not capable of receiving data. At the opposite end of the range, a smaller exit pupil means less area on the eye is collecting data. Images brightness decreases with decreasing exit pupil. Deep space objects grow dimmer rapidly as the exit pupil falls below 1 mm. The planets also start to become noticeably dimmer when the exit pupil falls much below 0.5 mm.</p> <p>Our eyepiece calculator provides warnings and error messages based upon the value of the exit pupil. These are intended to be guidelines as opposed to hard rules. There is no harm in violating these gidelines, but your enjoyment of the telescope may be diminished if you do. </p>