Best Telescopes Hub

Best Telescopes Hub

Address: Main Jordan University, Amman

Address: Amman, 1000, United States

Telephone: 00912669809745

Website: Visit Website

Opening Hours: Mon-Fri 9:00am-5:00pm




Question by troyd.smith: How do Telescope lens work and what are the different magnifications?
I have just come into possession of a used Telescope and am having trouble figuring out how it works. I have it assembled but can’t see anything through the eyepieces that were provided. there are 3 (25mm, 4mm, 2.5mm) and since it is winter the skies are cloudy and I can’t tell which lens is stronger so any info would be appreciated.

Best answer:

Answer by Raymond
The smaller the number on the eyepiece, the stronger the magnification. Therefore, begin with the biggest number 25 mm (it will be the easiest one to focus and the smaller magnification will make it easier to point the telescope to a known object).

Take the telescope outside during the day. (do NOT point it at or near the Sun — the heat from the sun is enough to damage the scope, the eyepiece and, most importantly, your eyes).

Looking down the tube, point the telescope to so far away objects that are surrounded by other objects.

Not at the sun.

Let’s say you found a row of houses three streets away. (far enough away that people will not phone the police to report a peeping tom).
With the higher numbered eyepiece (lowest magnification), try to focus until you see some detail (a wall, a door, a shrub). Remember that the image is normally upside down in a telescope.

Compare what you see (for example, the red house with the blue door) with what you get in the pointer (either a smaller scope, a tiny tube or just a notch outside the main telescope tube). This will tell you how accurate (or not) the pointer is.

Don’t do this using the Sun as a target.

When you are doing astronomy at night, always begin with the lowest magnification in order to find the object in the filed of view (telescopes have very narrow fields of view and it is sometimes difficult to get the object in the field of view). Only after you are confortable with following the object at lowest magnification should you try a higher magnification.

Higher magnifications are OK for the Moon and for planets. They will not give you much joy on stars (except, perhaps, to help you separate bright double stars).

In your case, you’ll find that going from 25 mm to 4 mm will be quite a jump (the field of view will be cut down to only 1/40 of what you started with. Make sure that the object is well centered before going from 25 to 4 mm. In time, you may want to buy yourself a 12 or 15 mm as an intermediate size.

Oh, just in case I forgot to tell you: don’t point the telescope at the Sun.

  • uddo
  • Recommendations

    Have your say

    Had a great experience dealing with Best Telescopes Hub? Share how great it was.

    Suggested Links
    Business Owners

    Get Listed for free with and get valuable exposure for your business.

    [ ]