Two eye pieces for model 78-9518

The smaller the number on the eyepiece the greater the magnification-- the maximum magnification of any telescope is about 50 times aperture. You scope is about 3 inches -- so 150 power is the maximum usable magnification.

BUT-- only under perfect conditions -- perfect sky-- perfect optics -- perfect eyepieces. Usually 30-40 times aperture is all you will get on a typical night with some turbulence in the atmosphere.

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Typically the left eye piece is not adjustable. You focus the left eye with the center adjustment and then focus the right eye with the eye piece adjuster. I hope this helps.

It's there to help you set the binoculars quickly to your own inter-pupillary distance. Just make a note of the number the pointer on the scale is at when you find a comfortable setting for your eyes and then when you next use them just set the pointer back to the same number. The scale is the angle of the yoke, and you'll often (but not always) find that the scale works on other makes and models as well to help you quickly set the binoculars up to your own preferences. The left eyepiece will also have a dioptre scale (not always accurate) so when you have sharp right eye focus, adjust the left eyepiece until you get sharp left eye focus as well.The scale on the eyepiece indicates how many dioptres (+/-) your left eye is different to your right eye. If you know the left eye setting and the yoke angle, you can quickly adjust most binos to your own comfort settings. Fixed focus binoculars are different in that they have dioptre adjustment on both eyepieces, so left eye settings from regular binos are not directly useful on fixed focus binos, but the yoke angle may still apply.

It is common for binoculars to have one independently focusable eyepiece.  If one eyepiece can be rotated, then that is the case.
If that is the case, focus through the one that DOES NOT rotate using the center control until you get a sharp image on that side.  Then rotate the eyepiece on the blurry side until the blurry side is sharp.  If you succeed at this, from henceforth the center control will focus both eyes adequately

Hi, one of your eyepieces has an twisty eye piece, its printed on the outside + & -, probably the right side? If its the right side you close your left eye and focus with your right, then open both & HEY Presto, you've got vision in both! Thanks Mark

Hi,

Most binoculars should allow you to grip the two sides and pull them closer together to fit the distance between your eyes.. Have you tried this?
What you should see is the two images come together to form one.

If you have tried this already and you still get the two images then it's possible the model is just too wide for your eyes.. If they're new you could try return them for another type that fit better..

If this works for you then here are the instructions for setting up the binoculars to give you the best result for your eyesight..


This is more common than you would think.. Here's how to set up a pair of binoculars to suit yourself.
Any good binocular will be able to do this and the reason is to allow you to adjust them for the difference in strenght between your two eyes. I wear glasses myself and sometimes contact lenses so it's good to be able to quickly adjust them.

1. turn the binoculars over so you are looking at the underside.
2. on the eyepieces can you see on one eye(usually the right eye) a little plus - minus marking. The eyepiece should be able to rotate a little to each side of this marking.
3. Set the rotating eyepiece to the middle setting.
4. Look through the binoculars as normal and bring the two sides together until you form the two circles that you see into one.
5. Pick an object app 10 meters away.
6 Presuming that the adjustable eyepiece is on the right hand side then close your right eye, look at the middle distance object you chose with your left eye and use the central focusing knob/wheel in the middle to bring your left eyepiece into focus.
7. Now, close your left eye and adjust the rotating right hand eyepiece while looking at the same object until your right eyepiece is in focus.
8. The binoculars should now be set for the differences in strenght of your eyes and you can use the middle focus control as normal.

Most binoculars have a soft rubber eyepiece that can be folded back for people who wear glasses but I, like most people I know who wear glasses, find it horribly uncomfortable.

This method allows you to set them for yourself and if someone else uses your binoculars you can quickly reset them for you.

Hope this helps...


- Oh yeah, sorry, forgot to mention.. This set up is so you can use them without wearing your glasses.. Much more comfortable!!

Hi,

You should be able to grab both sides of the binoculars and pull them together until the two images merge into one.. If you've done this already then the chances are that this model is too wide for the distance between your eyes (It happens more than you would think!!)
If this is the case, and they're new, you could try returning them to exchange for a better fitting pair..

Here are the instructions for setting up binoculars to suit your own eye-set and strength. You should be familiar with this when buying binoculars so you can test them in the shop..
The model you have is permafocus so you won't be able to adjust the focus but the first part should get you started..

This is more common than you would think.. Here's how to set up a pair of binoculars to suit yourself.
Any good binocular will be able to do this and the reason is to allow you to adjust them for the difference in strenght between your two eyes. I wear glasses myself and sometimes contact lenses so it's good to be able to quickly adjust them.

1. turn the binoculars over so you are looking at the underside.
2. on the eyepieces can you see on one eye(usually the right eye) a little plus - minus marking. The eyepiece should be able to rotate a little to each side of this marking.
3. Set the rotating eyepiece to the middle setting.
4. Look through the binoculars as normal and bring the two sides together until you form the two circles that you see into one.
5. Pick an object app 10 meters away.
6 Presuming that the adjustable eyepiece is on the right hand side then close your right eye, look at the middle distance object you chose with your left eye and use the central focusing knob/wheel in the middle to bring your left eyepiece into focus.
7. Now, close your left eye and adjust the rotating right hand eyepiece while looking at the same object until your right eyepiece is in focus.
8. The binoculars should now be set for the differences in strenght of your eyes and you can use the middle focus control as normal.

Most binoculars have a soft rubber eyepiece that can be folded back for people who wear glasses but I, like most people I know who wear glasses, find it horribly uncomfortable.

This method allows you to set them for yourself and if someone else uses your binoculars you can quickly reset them for you.

Hope this helps...


- Oh yeah, sorry, forgot to mention.. This set up is so you can use them without wearing your glasses.. Much more comfortable!!

Your binoculars are known as the Zeiss Classic or what was once known as the Dialyt. They focus differently from the usual binoculars like those mentioned. The rear wheel is to focus both binocular barrels while using them. The front focus wheel is adjust the right eyepiece to suit your right eye. Binocular manufacturers take into account each eye is slightly different. To focus the Dialyt...First close your right eye and turn the rear wheel until the image is sharp in the left barrel. Leave the focus wheel alone. Now close left eye and adjust the front wheel until the image is sharp for your right eye. The image should now be clear and in focus for both eyes. It should not be needed to use the front wheel from now on. The rear wheel is what you will use to change the focus from near to far objects.

You're on the right track since you can see something with the large eyepiece. The smaller ones will work the same basic way, but only for objects that are farther away. When you use a smaller eyepiece, the magnification goes up, and usually, the higher power eyepieces may not work for close objects.

Try looking thru the middle size eyepiece at a very distant big object, that is much further away, like at least 1/4 or 1/2 mile, in daytime. Try adjusting thru the entire adjustment range slowly, and at some point, you should see the image appear, and sharpen up.

The middle eyepiece will be typically be harder to focus easily, since the focus range is smaller. Likewise, the smallest eyepiece will be even touchier, but its the same process. Just turn the adjustment knob slowly.

It also helps sometimes to hang a weight like a book from the center of the telescope or tripod to help stabilize everything.

All of this will be easier in the daytime first to get practise, and to learn how careful you have to be. Good Luck.

Hello,
What you have is called a refractor-type telescope with the primary lenses (the Objective) at the top of the tube and the only other lenses in the system are your selection of eyepieces, probably a barlow lens (2X magnification of any eyepiece used), and a diagonal (in line mirror so that you cand see into the telescope from the side.). As the focal lenth of the eyepiece decreases, so does the distance away from the Objective Lens. I believe that you are using the telescope with a diagonal mirror which makes the optical path longer. The fact that your longer focal lenght eyepiece can focus and not your short one would be only if you didn't have the diagonal or the eyepiece all the way in tight to allow the focus mechanism (rack and pinioin) to get compressed enough to focus. Look at the Moon, if the image gets smaller then bigger as you focus, but not sharp, then I would have to tell you that your eyepeice lenses are not in the right order. Someoner may have taken it apart and didn.t put them back in the correct order. The lenese could just be very dirty also. Barrow a short focal lenght eyepice from a friend and see if it works in your system. Then you will know for sure.