# What is the difference between 10mm and 25mm telescope eyepiece?

## What is the difference between 10mm and 25mm telescope eyepiece?

The above formula dictates that a telescope eyepiece with a shorter focal length yields a higher magnification than an eyepiece with a longer focal length. For example, a 10mm eyepiece will always provide a higher magnification than a 25mm eyepiece.

## What eyepiece focal length is needed for 40X magnification?

True Field of View For example, a 25mm Plossl eyepiece generally has an AFOV of 50-degrees. Used in a telescope with a 1000mm prime focal length, the magnification is 40x.

**What is the magnification of a 6mm eyepiece?**

With an eyepiece of 6mm focal length, it has a magnification of 200x. Eyepieces come in a huge range of focal lengths, from less than 2mm to as long as 56mm (and longer).

**Is a 10mm or 20mm eyepiece more powerful?**

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 size telescope eyepiece do I need?

The largest-focal-length eyepiece you can use with your telescope is easy to calculate: multiply the focal ratio (the focal length of your scope divided by its aperture) by 7. For example, your Newtonian scope is f/5: the largest-focal-length eyepiece you should use is 35 mm.

### How much magnification does a 25mm eyepiece need?

40x

The eyepiece with the longer focal length say 25mm (low power) used on a telescope with a 1000mm focal length will produce a magnification of 1000 ÷ 25 = 40x.

**What can you see with a 4mm eyepiece?**

The Apertura 4mm Plossl eyepiece produces sharp, high magnification views of the Moon and planets, and, depending on the telescope, will also work great for double stars, planetary nebulae, and other deep sky objects. Like most Plossl eyepieces, the High Point 4mm has a 52º apparent field of view.