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Replace eyepiece D 50mm f 600mm Model No. 18 - 1561 Made in China Eyepiece Assembly lost. Is there a part number to identify what needs to be ordered?

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: garage sale purchase

This is a small telescope.You will get limited views with this scope.However you will be able to see the craters on the moon and the rings of saturn.Although they will not have any detail.You will be able to use it as a terestrial scope.For that it is ideal.You will need an erecting lens to turn the view right side up.You need atleast 1 eyepiece,finderscope,erecting lens(for terestrial views)and maybe a barlow lens.Keep in mind it is not magnification you are looking for it is the ability to gather light and a 50mm is not going to gather much.the bigger the objective lens the more light it will gather.Think of animals that come out at night,their eyes are bigger than those that are out in day light.Because the bigger the lens the more light it gathers,so magnification only plays a part if you can see the target with your light gathering ability.Because just like 1000x0 is 0 the same gos for telescopes.1000xblack is black..

Posted on Sep 15, 2007

SOURCE: focus with erector eyepiece on

Some eyepieces cannot come to focus in certain telescopes-- try a different eyepiece.

Posted on Dec 28, 2008

  • 1027 Answers

SOURCE: i need an eyepiece for a jason telescope model 411 where can I bu

Try www.telescopes.com They have a wide selection of standard eyepieces.

Posted on Sep 09, 2009

SOURCE: Completed setup, can't see anything through eyepiece.

I answered your question already-- TURN THE SCOPE around you have it mounted backwards! The eyepiece end is pointed UP. Like the picture above in your question.

Posted on Jan 23, 2010

cptndob
  • 11 Answers

SOURCE: Bushnell 18-1560 Telescope

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.

Posted on May 31, 2010

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Cant find this model 18-1750. need eyepieces


Eyepieces come in .965, 1.25 and 2 inch formats. Measure the diameter of the focal tube to determine if you have a .965 or a 1.25 inch focuser. If you have a .965 inch tube, you are very limited in choices. Antares sells very nice .965 plossls.
If you have a 1.25in. focuser, your choices abound. Suggest a 25mm plossl or 25mm MA eyepiece first. Max magnification with a 50mm objective is about 100x. to find the highest eyepiece you can use divide the focal length of the scope by 100.

Jan 04, 2013 | Bushnell Optics

1 Answer

When i look through the telescope eyepiece everything is blurry.


This is a very small 60mm telescope not much bigger than a pair of 50mm binoculars, you are applying TOO much magnification. Use only the eyepiece with the largest number written on it and do not use the 2x barlow lens.

Sep 11, 2011 | Meade 60AZ-T Telescope

1 Answer

No they did not give me the right stuff they gave me 20mm but it was supposed to be a 60mm


Why would you need a 60mm eyepiece? I doubt these can even be purchased since I have never seen anything over 50mm -- this is a VERY low power eyepiece! The bigger the number the lower the magnification.

The normal ones would be 20mm-25mm and a 10mm-12mm.

This company sells eyepieces-- they come in 3 sizes, .965, 1.25, and 2 inch. Measure the hole in the focuser and buy the correct size:

http://www.agenaastro.com/

Apr 03, 2011 | Bushnell Deep Space 78-9512 (120 x 60mm)...

1 Answer

What do you use the barlow lesns for?


The Barlow lens goes between the diagonal and an eyepiece. It doubles (2x) the magnification of the eyepiece used.It does this by halving the f/ ratio of the scope.
Eyepiece alone gives 35x; barlow with eyepiece =70x.

Note: this scope comes with an erecting eyepiece and is NOT suitable for atronomy use (other than perhaps the moon)

Mar 19, 2011 | Tasco Specialty 301051N (100 x 50mm)...

1 Answer

Can't find a 2" eyepiece


That's because it is probably a 1.25 inch focuser. However this adapter will allow you to use 2 inch eyepieces-
http://agenaastro.com/blue-fireball-1-25-2-eyepiece-adapter.html

OR replace your entire focuser assembly with a 2 inch focuser.

Nov 17, 2010 | Meade DS-90AT Telescope DS-90AT

1 Answer

Which lenses go where and which one do I look through?


The EYEPIECES control magnification. The lower the number written on the eyepiece the HIGHER the magnification. Start out using the eyepiece with the LARGEST number written on it.

Sep 29, 2010 | Meade 155W (5 x 50mm) Telescope

1 Answer

Eyepiece assembly bushnell telescope


You never told us what model number or telescope TYPE you own. Is this a refractor or a reflector. ???

If a REFRACTOR usually you have a diagonal, the diagonal goes into the focuser and then the eyepiece goes into the diagonal.

On a REFLECTOR the eyepiece goes directly into the focuser.

Sep 04, 2010 | Bushnell Optics

1 Answer

We have lost an eyepiece from our rrasco zip 323z binoculars. where can i buy a replacement?


For this model it probably wouldn't be economicaly viable to purchase the eyepiece. You would be better off buying a new pair with full warranty/guarantee.

Feb 17, 2010 | Tasco Optics

1 Answer

Eyepieces lost


You did not mention your telescope make and model so:
1. measure eyepiece holder. Determine of you use .965in. or 1.25in. diameter eyepieces. If you use .965 eyepieces you are limited in choices. HANDSONOPTICS.COM carries nice Plossls. SURPLUSSHED.COM. sells .965 moon filters and cheaper eyepieces. If you have a 1.25 eyepiece holder, the skies the limit on eyepieces. Check Ebay plus other sites.
2. Determine the focal length of the eyepiece you want to use. As a rule, your scope can magnify 50x per inch of aperture although looking at just the moon, you can stretch that a bit. For example, a 80mm reflector (3.1 in). x 50 = 155x max. magnification (must be a perfectly clear night)
So now find the focal length of the scope (stamped/labeled somewhere) Typical refractor is 700mm. For maximum power (155x) it is: focal length of telescope/focal length of eyepiece = magnification. Or FL (scope)/ magification= FL eyepiece. 700/155= 4.5mm. This size will have terrible eye relief unless you spend $$$$$. Suggest a 10mm eyepiece which gives 70x power and a great view of the moon and planets

Nov 15, 2007 | Tasco Luminova 40114675 (675 x 114mm)...

1 Answer

Garage sale purchase


This is a small telescope.You will get limited views with this scope.However you will be able to see the craters on the moon and the rings of saturn.Although they will not have any detail.You will be able to use it as a terestrial scope.For that it is ideal.You will need an erecting lens to turn the view right side up.You need atleast 1 eyepiece,finderscope,erecting lens(for terestrial views)and maybe a barlow lens.Keep in mind it is not magnification you are looking for it is the ability to gather light and a 50mm is not going to gather much.the bigger the objective lens the more light it will gather.Think of animals that come out at night,their eyes are bigger than those that are out in day light.Because the bigger the lens the more light it gathers,so magnification only plays a part if you can see the target with your light gathering ability.Because just like 1000x0 is 0 the same gos for telescopes.1000xblack is black..

Sep 02, 2007 | Bushnell Voyager 78-9440 (440 x 12.5mm)...

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