Which telescope lens is stronger 10mm or 20mm?

The most important eyepiece characteristic is focal length. … This means that a smaller number on an eyepiece gives a higher magnification. A 10mm eyepiece would provide twice as much magnification as a 20mm eyepiece. It also means that the same eyepiece gives different magnifications on different scopes.

What is a 20mm lens good for telescope?

All telescopes have a fixed focal length, just like lenses on a camera. So a 20mm focal length will give you a wider field of view than say a 300mm. You will also notice that with a 300mm you get a larger image of the subject, be it a person or animal or even the moon.

What is a 10mm telescope lens good for?

10mm – 13.9mm Telescope Eyepieces: These are fine to use across all focal lengths and offer great background darkening capabilities for studying planetary nebula, small galaxies, planetary details and lunar details.

Is higher mm better for telescope?

The aperture's diameter (D) will be expressed either in millimeters or, less commonly, in inches (1 inch equals 25.4 mm). As a rule of thumb, your telescope should have at least 2.8 inches (70 mm) aperture — and preferably more. … A larger aperture lets you see fainter objects and finer detail than a smaller one can.

Is a 20mm eyepiece good?

A 20 mm is useful just as a 13 mm is useful in most any telescope but I'm not sure "all purpose" is a good description. My telescopes range in focal length from under 400 mm to about 2800mm, a 20mm is not a planetary or high power or even mid-power eyepiece in any of them, it's a low to mid power deep sky eyepiece.

What can you see with a 100mm telescope?

Which eyepiece is best for viewing planets?

The focal length of the telescope is 900mm, so to achieve the maximum useful magnification, then a 4.5mm eyepiece would be ideal. One of the best parts about planetary viewing or imaging is that since the objects are so bright, you can do it just about anywhere regardless of light pollution.

What is a 20mm eyepiece?

20mm telescope eyepiece excels at low power scanning of open star clusters and viewing of nebulas and larger galaxies. Offers a 52-deg apparent field of view for clear, sharp images of impressively high contrast. Multi-coated for excellent light transmission and bright, clear views.

What can I see with a 10 inch telescope?

And lots of “usual” objects like the Moon, planets, double stars, star cluster, galaxies, nebulae, comets, asteroids, the Sun (with proper solar filter)… so yeah, a lot.