Product Description
It provides a huge 8.9mm exit pupil with an f/4.5 Dobsonian reflector. As the eyes of most observers are unable to dilate to this size, this eyepiece will probably waste a good portion of the light-gathering capacity of a fast focal ratio scope. It is better suited to the longer focal ratios of refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains than it is to reflectors with focal ratios shorter than f/6.
At f/6 and above, it would be an excellent choice to give you the widest and brightest field possible from a 1.25" focuser telescope. The very long eye relief makes it a good choice for those who wear eyeglasses.
Tech Details
Barrel Size | 1.25" |
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Eye Relief | 23mm |
Field of view | 43 |
Focal Length | 40mm |
Number of optical elements | 4 |
Weight | 8 oz |
Warranty | Limited Lifetime |