Question about Bushnell Voyager 78-9945 Telescope

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Should I be using the 2x lens or the 1.5x lens for looking at stars, also what is the correct setup of the different lens?

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  • jordirolheis Feb 07, 2010

    But my scope is 114mm or 4.5 inches and the bushnell site says that it can support up 226x magnification...

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No matter how much magnification you use stars are always just points of light. You cannot resolve a star into a disk.

Your scope will work better at lower powers. I probably would NEVER use either the 2x lens. The maximum magnification of any telescope is about 50 times aperture. You scope is about 2-3 inches so your max is about 120 power under PERFECT sky conditions.

Read the TIPS on my profile page.

Posted on Feb 07, 2010

  • Joe Lalumia aka TelescopeMan

    OK- 4.5 times 50 = 225 power BUT-- this is only under the best sky conditions and with perfect optics. Typically only about 30 times or so is possible. SO-- about 140 power.

    In my 8 inch LX90 I rarely even use anything above 150 power. Once in a while 200 power. Magnification is the least important quality in a telescope. Aperture and quality optics are more important. You can actually see almost all of the Messier objects (look-up Charles Messier on Google) with a pair of 10x50mm binoculars from a dark sky site away from city light pollution. This is 10 power magnification.


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Aligning a scope requires several things to be correct.
1. You must follow the setup in manual 100%
2. You must pick the correct alignment stars. Most failed alignments are because you aligned on the wrong star. So alignment requires you to learn the names of a few bright stars and be able to spot them in the sky.
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But the wide angle front lenses, were designed for compact camera's and video camera's And although the 18 mm could become like 12 mm, but you will introduce colour fringing, distortion and more , that can't be corrected in normal programs like Lightroom.
I used a wide angle 0,5x (52mm) Hama and a tele 1,5x from cannon, on my video and later on my canon powershot G9, to find I was looking for a DSLR. I never was quiet pleased with the results.

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I am inexperienced at this, attempting to enjoy this with my grandsons...When using the diagonal mirror, what is the difference in using the H20 eyepiece and the SR6 eyepiece? When using the 1.5x Erecting...


The numbers on the eyepieces are the focal length in millimetres. You can calculate the magnification of the telescope by dividing the focal length of the main objective by the focal length of the eyepiece in use, so if the main focal length is 700mmm and you use the H20 (Huygens 20mm) eyepiece, you will get a magnification of 35. The SR6 ( Symmetric Ramsden 6mm) would give about 117 magnification. You will find that the LOWEST magnification is about the only one that is usable. I wouldn't use the Barlow at all.

There is a good website full of info about this HERE

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Telescope is definitely assembled correct but fail to see any magnification of light thru tube with use of either lens. Very clear nite but little moonlight, does that matter? Seems we get no magnification...


Did you try this during the day time. Stars are always just points of light no matter what telescope you use.

Try for the moon and or Jupiter which is up in the sky right now after dark. It looks like a BRIGHT star.

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C-af 1 2x teleplus mc7 will not auto focus with my 90-300mm canon ef lens on my canon d7 dslr. can you help please.


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This is a small REFRACTOR style telescope. Put the eyepiece with the largest number written on it into the telescope. DO NOT use the small lens that says 2x (barlow) on the side.

Read this web site:
http://www.texasastro.org/telescope.php

so you understand what the different types of telescopes look like when setup correctly. Bushnell has a web site with all of their current manuals here:
http://www.opticsplanet.net/bushnell-warranty.html

Look down the web page and find your telescope and download a manual. Read my TIPS on my profile page.

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1 Answer

How I know the red dot is working ok, is


This is a 60mm telescope not much bigger than a 10x50mm pair of binoculars. Your maximum magnification will be about 100 power. Yes I know they said 200-300 power on the box. This was a lie.

Do not use the 2x barlow. Probably be just too much magnification. Put the eyepiece with the largest number written on it into the telescope; then try the same eyepiece with the 1.5x barlow. That is probably all the magnification the scope can handle.

Stars are always pinpoint light sources, no matter how large the telescope. They are hundreds or thousands of light years away.

The "red dot" should be pointed at exactly the same spot as what is in the eyepiece. Center a bright star in the eyepiece, then without moving the telescope... center the red dot on the star. Now you can use the red dot to POINT the telescope exactly to a sky object.

This web site may also help you:
http://www.cloudynights.com/item.php?item_id=810

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