Does 62° differ from regular

Depends on what exactly "regular" means. An apparent field of view of 62° is more than what Huygens eyepieces (around 30-35°) and Kellner eyepieces (about 45°) have, the usual design for low-cost eyepieces such as those which are included with many beginner telescopes. Furthermore, 62° is also more than what Plössl and Super Plössl eyepieces (around 45-52°) offer, which are more expensive than Huygens or Kellner eyepieces and which are typically the first choice for better and yet affordable all-around eyepieces. On the other hand, 62° is slightly less than for Erfle eyepieces (around 65-68°, usually called WA for wide angle) and less than for ultra-wide angle eyepiece designs (anything beyond about 80°), both of which are more (WA) or much more (UWA) expensive than these aspheric eyepieces. From my point of view, these aspheric eyepieces mainly rival Plössls, as they have about the same optical quality with a larger apparent field of view for less money. They are no match for WA and UWA eyepieces, both in optical performance or price, and they easily outperform Huygens or Kellner eyepieces.

Is it plastic or metal

Hi Ken Wilson,the aperture of 4mm telescope eyepiece is aluminum alloy, and the mirror body is plastic, the lens is optical glass.hope this can help you!Sincerely Angela

What does the focal length mean on an eyepiece? I thought that was just for concave mirrors.

All eyepieces have a focal length and it is very important to know what it is and what it means. Being made of usually several lenses, the eyepiece will have a focal plane. That's where the eyepiece focuses on and examines the image formed by a telescope, for example. Usually the focal length is printed right on the barrel of the eyepiece in millimeters. The importance of this is that you can determine the magnification of your telescope by knowing the scope's focal length and the eyepiece focal length. Say you have a telescope that has a focal length of 500 mm. this would also likely be somewhere on the scope or in the instruction manual. The magnification of the telescope will be the focal length of the telescope divided by the focal length of the eyepiece. So if you have a 500 mm focal length telescope and use a 4 mm eyepiece, the magnification is 500/4=125X. Or if you use the same scope with an eyepiece that has a focal length of 10 mm the magnification will be 500/10= 50X. An eyepiece with a focal length of 25 mm gives a magnification of 500/25= 20X. So you can see the shorter the focal length of the eyepiece for a given telescope, the more power or magnification. But there are drawbacks to magnification. With higher magnification you get a narrower field of view, compared to lower magnification. Also, for a given scope there is a limit to the amount of magnification it will handle. Too much magnification and the image gets blurry or soft. Magnification is not the most important number when using a telescope. There's more to it, hope can help you!

Brand	SVBONY
Manufacturer	SVBONY
Model	FAUF9301AA-F9301AB-F9301AC
Model Name	FUSN6001A
Product Dimensions	20 x 10 x 10 cm; 117.93 g
Item model number	FAUF9301AA-F9301AB-F9301AC
Compatible Devices	astronomical telescopes with a 1.25 inch focuser
Special Features	Aspherical lenses eyepiece, Three eyepiece sets; 4mm 10mm 23mm, Wide angle 62° eyepiece
Colour Screen	No
Minimum diaphragm opening	1.25 f
Min Focal Length	4 Millimeters
Power Source	Manual Operation
Batteries Included	No
Batteries Required	No
Viewfinder type	Optical
Does it contain liquid?	No
Includes Rechargeable Battery	No
Includes remote	No
External memory included	No
Manufacturer	SVBONY
Country of Origin	USA
Item Weight	118 g

SVBONY 1.25" Fully Coated Wide Angle 62° Aspheric Telescope Eyepiece Kit - 4mm, 10mm, 23mm - Beginner to Experienced - Unisex

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