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Telescope model 750150 focal lenth 750mm

When i went out side i could not see anything what am i doing wrong first time user

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Posted on Jan 02, 2017

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SOURCE: BUSHNELL DEEP SPACE SERIES 420 X 60 REFRACTOR TELESCOPE MODEL 78

Do not buy either telescope-- both are junk.

Instead buy one of these --

http://www.telescope.com/control/product/~category_id=dobsonians/~pcategory=telescopes/~product_id=09804

http://www.telescope.com/control/product/~category_id=dobsonians/~pcategory=telescopes/~product_id=08942

http://www.telescope.com/control/product/~category_id=refractors/~pcategory=telescopes/~product_id=09794

Posted on May 15, 2009

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SOURCE: I broke the focal tube

You can contact repair on this web site they may have a new one you can buy--

http://www.tasco.com/pages/repair-and-warranty/

Or you can buy another focuser from many on-line retailers- here is one:
http://www.telescope.com/Accessories/Telescope-Focusers/pc/3/51.uts

Posted on Jun 18, 2011

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1 Answer

Can anyone tell me how to find an instruction manual on a telescope 750150 please


https://storage.googleapis.com/skywatcher-canada/upfiles/en_download_caty01316546551.pdf
I search google telescope 750150 instruction manual
I do not know anything about telescopes but I have search the internet for the last 10 years since I bought a computer for my daughter to uses for school.

Aug 13, 2017 | Optics

1 Answer

Unable to view oncew assembled. Please check parts list


Since you did not reply with make and model see the following general rules below. Always start with the highest number eyepiece (lowest magnification) and do NOT use the barlow until you get comfortable with the scope
  1. Get Stellarium or another fine astronomy program
  2. During the day, point the telescope at a part of the landscape about 100 yards away.
  3. Use the lowest power eyepiece (highest number) in the focal tube.
  4. Center the landscape object in the telescope.
  5. Align the finder scope so that it points exactly where the main telescope is.
  6. At night, leave the scope out to reach thermal equilibrium (about an hour for small reflectors and refractors)
  7. If the scope is on a EQ mount, polar align.
  8. Point the finder at the moon. The moon should be in the main scope also.
  9. Practice finding the moon before you start on the planets
  10. Once you are comfortable with the moon and planets, you can go for the deep sky objects

Dec 29, 2011 | Optics

1 Answer

The eye piece lens is missing. How do i find the model number of the telescope to order a new eye piece and a manul for this telescope


Most telescopes use a standard fitting eyepiece with a 1.25 inch outside diameter barrel. You can measure the mount where the eyepiece goes to make sure that yours is this size, then search on eBay or Amazon for "1.25 eyepiece" and you will find many available. None of these will be made by "Edu-Science", but any make will fit.

The other variable will be the focal length of the eyepiece, which is what determines it's power. The power of the scope will be the focal length of the main objective divided by the focal length of the eyepiece, so a 9mm eyepiece will give a higher magnification (and be dimmer and harder to focus and find objects) than a 20mm eyepiece. It is usual to have two or three different focal length eyepieces for viewing different objects.

You will find a large variation in prices, which is partly due to the difference in quality and type of construction of the eyepieces. Kellner eyepieces are simple and cheap, whereas Possl or orthoscopic ones are more complex and cost more. There are reasons why people will pay more for the better eyepieces. Avoid eyepieces marked with the letters "H" or "SR" before the focal length.

There is an excellent website for beginner telescope users at THIS LINK

Jan 20, 2011 | Edu-Science (10166) Telescope

1 Answer

Got a( model:NG76AZ Focal Length:700mm


Put the eyepiece with the LARGEST number written on it into the telescope. DO NOT use the 2x barlow if you have one.

Try focusing on a distant object during the daytime.

Nov 04, 2009 | National Geographic 76AZ (525 x 76mm)...

1 Answer

BUSHNELL DEEP SPACE SERIES 420 X 60 REFRACTOR TELESCOPE MODEL 78


Do not buy either telescope-- both are junk.

Instead buy one of these --

http://www.telescope.com/control/product/~category_id=dobsonians/~pcategory=telescopes/~product_id=09804

http://www.telescope.com/control/product/~category_id=dobsonians/~pcategory=telescopes/~product_id=08942

http://www.telescope.com/control/product/~category_id=refractors/~pcategory=telescopes/~product_id=09794

Apr 18, 2009 | Bushnell Deep Space 78-9512 (120 x 60mm)...

1 Answer

Optisan Star 750150


Hi Tony, please send me your email address and I will email back the manual. kind rgds, Lilie

Mar 10, 2008 | Magnacraft Optisan Telescope and...

1 Answer

35mm Pantex Camera model # ME


That's the focal length of the lens. If there're two numbers, then the lens is either a zoom or a "vari-focal" lens, meaning the lens can change focal length from one end to the other. In this case, the lens can change its focal length from 150mm to 750mm, either by turning a ring or pushing/pulling a ring.

BTW I wasn't aware Pentax had a zoom that long. Are you sure it's not 75-150?

Dec 14, 2007 | Pentax Cameras

3 Answers

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.

May 15, 2007 | Bushnell Deep Space 18-1560 (150 x 53mm)...

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