Most quality telescopes require the use of an eyepiece as part of the magnification power of the telescope. If you have a telescope with a single eyepiece, you will want to investigate using one or two different ones for different purposes. The eyepiece telescope has this advantage of those that do not have a changeable eyepiece.
The eyepiece plays a major role in the magnification power of an eyepiece telescope. In order to calculate what the magnification would be with a different eyepiece you would divide the focal length by the eyepiece focal length. Since the focal length of an eyepiece telescope will remain constant, by changing the eyepiece you can change the power.
Not everyone changes an eyepiece to increase the magnification, especially if wanting to view areas that are closer or they want a wider field of view. One reason to reduce the magnification may be to create a finder lens for your telescope to be able to find an object. With a strong eyepiece telescope, finding the moon through the normal magnification could be like trying to find it while looking through a straw.
Effective Fields Of View Also Changes
The true field of view, that is what you can see as an undistorted image can also be adjusted by changing the eyepiece on an eyepiece telescope. The field stop on an eyepiece is the rotating ring that limits the field size. To find the true field of view, divide the field stop diameter by the telescope’s focal length and then multiply by 57.3.
In order to obtain lower power viewing of large objects your eyepiece should deliver the widest possible field of view. A one and a quarter inch eyepiece would have a field stop of 27mm maximum. The maximum field stop on a two-inch eyepiece is about 46 mm.
A general rule of thumb with an eyepiece telescope is that choosing an eyepiece with shorter focal lengths and larger apparent field of view, bringing brighter, clearer images of objects including fainter stars.
Two things to consider when looking at news eyepieces could be a Barlow lens, which simply is a magnifier, which adds magnification power to the eyepiece telescope, and what is called eye relief.
Eye relief is the space between the lens and your eye and should have enough room for you to be able to wear your glasses, if needed, as well as to keep your eyelashes from brushing against the lens.
Who created the hubble telescope lens?
So I really need to find out who created the lens for the Hubbel telescope. Thank you!!!!!
What is the significance of a telescope lens?
I’m not doing a science paper on this or anything, just have to write how I would feel if I were the lens in Galileo’s telescope (I know, pointless). I just need some basic things. Don’t have to go all into it.
Its an inatamite object. Beyond that it magnifies things so they can be seen w more clarity.
You would feel nothing,
Yet see all that was put b4u
hope this helps
Can you clean a telescope lens and mirror with standard sunglasses cleaner and cloth?
My telescope needs a good dusting but I don’t want to scratch the mirrors and lenses. I have some sunglasses cleaner and the cloth that comes with it. At first this seamed ideal, but then it dawned on me that perhaps a the moisture can get between the lenses and fog up upon use also the mirrors can scratch from the cloth.
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.
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.
Can you attach a telescope lens to a video camera?
I have a JVC Everio GZ-MS120BU digital video camera, and since the meteor shower is tonight, I would like to record it. I have a couple Celestron telescope lenses for my telescope, but I was wondering if I could rig something up, like taping the telescope lens to the end of my video camera so I can see the meteors more clearly. Would that work?
No. The best view of a meteor shower is with the naked eye, not through a telescope. A telescope lense will only look at a small section of the sky. And being as they move very quick thorough the sky, the odds of seeing one through a telescope lense are very high. Also, a meteor can be very bright so a view through a telescope is not a good idea.
I don’t know what the optics of your video camera are like but if you want to try and capture it, the wider the view, the better.
Best and cheapest macro and telescope lens for sony a55?
im getting a sony a55 slt (dslr) for christmas and i would like a macro lens and a telescope lens for it but this is my first dslr and im a student so not they best or money =[ so i dont what to pay a fortune. So any info will help and if you think theres any other equipment that you think would be helpful that info would help to. Thank you!