Bushnell Deep Space 78-9512 (120 x 60mm) Telescope Logo

Related Topics:

Posted on Nov 21, 2010
Answered by a Fixya Expert

Trustworthy Expert Solutions

At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.

View Our Top Experts

I am able to see with the 20m Lens but once i insert the 5mm Lens it looses focus and i cannot see anything, i tried adjusting the focus again with no success. The worst thing that even at day light i cannot focus the 5mm lens on any far object. Is this a problem with the lens or the focus adjuster?

1 Answer

Joe Lalumia aka TelescopeMan

Level 3:

An expert who has achieved level 3 by getting 1000 points

Superstar:

An expert that got 20 achievements.

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

  • Master 3,186 Answers
  • Posted on Nov 23, 2010
Joe Lalumia aka TelescopeMan
Master
Level 3:

An expert who has achieved level 3 by getting 1000 points

Superstar:

An expert that got 20 achievements.

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

Joined: Nov 04, 2007
Answers
3186
Questions
1
Helped
952922
Points
7111

That's because the 5 mm is too much magnification for your small telescope. Maximum magnification is a function of APERTURE. Which is how big is the front lens or the mirror.

Your scope has about a 2 inch aperture, so the maximum posiible magnification is about 100 power (if it is like the one in the picture above)

50 times aperture (2 inches)-- 100 power

It will only achieve 50 times if the optics are perfect and the sky is very transparent and stable. Usually only 30-40 times is all you normally get.

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1helpful
2answers

How can I adjust focus?

Turn the grey ring around the lens (where the light comes from) until the image is sharp.
0helpful
1answer
0helpful
1answer

I have an Infocus LP70. My question/problem is in regards to the lens. I dropped the projector from about a foot off the carpet and onto the lens. The focus/zoom became jammed together, AND the lens came...

What I would try to do is, loosen the screw so its not stiff to adjust, adjust the lens to the right position then tighten up the screw again. Hopefully this should work for you!!
0helpful
1answer

Canon rebel T3 focus problems

in manual mode, will not try to focus itself, my be the manual auto switch is faulty, or the focus related mechanism not rotating the lens, open the lens carefully check the focus motor and gear set (engine is the technical term)
2helpful
1answer

Lens adjust is sticking. With the lense out you

since you have then lens out, get a wide blade flathead and insert it in the smallest part if **** that it will fit into behind the focus ring and turn the blade like you are trying to widen the **** all the way around until it pops out into it's normal position. Getting the entire lens back in properly is a bit tricky since the threads are easily stripped. First screw it all the way back on and then check the focus on the screen. You want to see a crisp image in 3 if not 4 of the outer corners of the screen. It is best to use something with text that fills the whole screen so you can see the 4 corners as you adjust the focus. If the focus is good in the corners, leave it alone. If not,hold the back of the projector in one hand and forcefully push the lens into where you screwed it on and see if it pops into place. It really is trial and error. Once you have a clear picture it is a good idea to remove the top cover and glue all around the base of the tube where it screws on so it doesn't come loose again.
0helpful
1answer

Focus error? The camera won't focus. Focus Error is displayed in the viewing screen. Zoom action & everything else seems to work fine. Won't focus, won't take pictures.

This is a known issue with Fuji S3000 cameras caused by dust and dirt that get in through the loosely mounted lens mechanism, there are only three solutions.

  1. If under warranty you can send the camera in for repair.
  2. Saturate around the lens with WD40 and wiggle the lens until it becomes responsive again every month or so.
  3. Dismantle the camera and clean out around the internal gear-box and lens components about once a year.

0helpful
1answer

Can't focus using 5mm lens

TOO much magnification for that 3 inch telescope. The most you will get is about 120 power or so on perfect sky nights. Try a 10mm or 9 mm as your most powerful eyepiece.

50 times aperture is the maximum possible.
0helpful
1answer

Pentax k1000 ....lens will not focus...(one 50mm...other 70-210mm)...happened once before...brought to camera store and of course it focused...nothing wrong...took some pics and worked ok...now not...

Try this first.

Set your lens focus to infinity and focus your screen at a far away object (like a distant lampost). If it,s not in focus, then you have a misaligned mirror. Adjust your mirror so that a infinity setting, the split-screen image merge well to form a well focussed image. Hope that helps.
20helpful
4answers

Picture

Hi, I would assume that by "i have tried with the settings..." that you are referring to the Camera Properties in Windows. Perhaps you should try mechanical setting, that is manually adjust the focus of the lens. Around the actual lens to the front of the camera, rotate the stub/protrusion while watching the camera display on your monitor. Adjust to your preference. It may also be a good idea to increase the light in your work area. Hope this works out for you. Good luck and pls post again how things turn up or if you would need further information. Kind regards.
Not finding what you are looking for?

138 views

Ask a Question

Usually answered in minutes!

Top Bushnell Optics Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

Brad Brown

Level 3 Expert

19187 Answers

john h

Level 3 Expert

29494 Answers

Are you a Bushnell Optic Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...