Question about Bushnell NorthStar 78-8890 (300 x 90mm) Telescope

1 Answer

Lens Fogging Issue

I appoligize for entering the wrong product info but i cant find anybody to ask about this fogging issue im having. maybe some of the fixes will work for this type of scope. Hoping to get some help with an issue with a Bushnell Sportview scope i just mounted on my .22. After picking up some mounting rings,i noticed that after looking through the scope it was no clear. so i cleaned both outter lenses with a cloth i use on my 35mm camera lenses. then i noticed that both inner lenes were fogged up. so i unscrewed each one, cleaned, replaced and did the same to the other. i am still not able to clear up the fogging so im thinking that opening the inner portion was not the brightest idea. any help would be great.


Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 3,186 Answers

Apparently this is NOT a waterproof rifle scope. I would return it as you will have this same problem only worse out in the field. Buy a waterproof nitrogen filled rifle scope.

Posted on Sep 19, 2011


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

A/c in 2006 hyundai sonata needs refrigerant every few days?

A/c experts use a dye to find the leak. Don't guess, as a leak can happen lots of places.

Jul 27, 2017 | Hyundai Cars & Trucks

1 Answer

I have a pair of Docter 7x42B and the left lens is foggy. do they have a gas in them? How do I get them fixed?

Binoculars are normally purged of all air and filled with nitrogen to prevent fogging and mould issues. If one side fogs internally it's a sign that a seal has leaked and needs to be replaced. The manufacture or any camera repair store should be able to replace the seal and refill the chamber with nitrogen.

Oct 29, 2013 | Optics

1 Answer

Window fogging up inside

Hot air on clod windscreen will cause the window to fog up. You have to remove the humidity ( water in the air) inside the car to stop fogging up. The answer is to run the a/con which de humidifies the air then the heater the job Run both together.r it is sometimes called climate control in cars.

Mar 21, 2013 | aFe 2001 Dodge Durango - 4.7L V8 - Air...

1 Answer

Fog in the lense of my Vivitar 75-300mm macr focusing lense, can't seem to locat a place to have the lense cleaned. I live in Palestine Texas and have a limited budget.

The fog is most likely lens fungus and is very difficult to remove, so is also expensive to remove. It's not suited to a DIY repair without special tools and equipment. Spare parts for your lens are practically unobtainable, and camera and lens repairers are much rarer these days.

With all due respect, your lens is nearly worthless even if in perfect condition, so your lens is totally beyond economic repair.

You have the following options (in no particular order):-

1. Discard your lens and replace it. You can find replacements very cheaply online, although you may need to be a little flexible as to what's acceptable. Tamron Adaptall-2 lenses can be very good and you can switch the lens mounting to fit your Minolta MD. Lesser-regarded brands such as Sunagor were also in reality very good lenses and their 80-250mm has a very similar effective focal length to your Vivitar. Hoya were also a less-regarded brand despite actually making many of the lenses for "better" brands (including Vivitar, from time to time). You can also find replacement lenses for free either by asking around friends and relatives or by looking/asking on FreeCycle and Gumtree, although it is harder to find them for Minolta than say, Canon, Nikon or Pentax. On the flip side I have had many complete and perfectly functional 35mm SLR outfits from FreeCycle, so if the lens comes with a body attached who's complaining?

2. If the fogging does not affect your images then live with it. if it does reduce contrast, then consider scanning your negatives/transparencies and using free software to repair the images.

3. Leave your lens out in daylight with the lens cap removed. Some of the common types of lens fungus are destroyed by UV light. It won't physically remove the fungus, nor will it repair any damage to the optical elements inside your lens, but it can recover an otherwise unusable lens. If the fogging inside is due to moisture instead, then the fogging may dissipate if the lens is left in a warm and sunny location which is well ventilated. Marks may remain, but they'll rarely affect image quality.

Good luck.

Jul 16, 2011 | Vivitar 75-300mm f/4.5-5.6 Manual Focus...

2 Answers

My head lights are very fogged i bought the restoration kit but cant figure out how to take off the cover to apply the soulution

Those restoration kits are only for the outside of the lenses. They oxidize and you use that kit to remove oxidation. If the haze is on the inside you need to replace the entire housing. They're sealed from the factory. Some people have tried to disassemble and clean insides but the success rate is very low.

Feb 18, 2011 | 2000 Mercury Cougar

1 Answer

Im not getting heat in my 1989 ford bronco II. i replaced the thermostat< and still only getting luke warm. im not getting drips in the passenger floorboards, and my windsheild isnt fogging, so i...

You could have an air bubble in the system. It is also possible that the heater core has debris blocking the flow of water. I would check to see that you are getting good circulation by checking the heater hoses near the firewall. If they are both getting hot then you may have an air baffle issue inside the heater box.

Dec 03, 2010 | 1989 Ford Bronco II

1 Answer

Binocular fogging, outside lens only. Do all bino's do that?

If it gets foggy on the outside then yes. Just like glass when you breath hot air on it. Most commonly fogging occurs on the outside of the eyepiece lenses. This is because the heat from your body or breath is warmer than the glass and condensation occurs. You can do a few things to help this problem go away. One is to keep a little airspace between your face and the eyecups. If you press the eyecups against your brow with your head bowed a little it lets air flow from underneath. Another is to make a small hole in the eyecups to allow air to circulate. This will void and warranty as it is a deliberate act. Some military binoculars have a small hole for this reason. The other you can do is purchase a fog free cloth. This is a cloth that is imregnated with a chemical that leaves an invisible film on the glass helping keep it fog free. Just ask at a camera store which is suitable for use on coated optics.

Aug 03, 2009 | Optics

2 Answers

Mercedes c180 1995 new windscreen- problem with de-fogging


Jul 16, 2009 | 1992 Mercedes-Benz Mercedes Benz 300 Class

2 Answers

I have front glass fogging issue

Possible heater core leak. Is your coolant level going down, and perhaps an odour inside? Can you feel a sticky film of inside of windsheild?

Dec 12, 2008 | Honda CR-V Cars & Trucks

2 Answers

Nikon N80 Shutter? Issue

dear ben505,
This could be due to the shutter leaking light from the top or bottom, and it could also be caused by light leaking in through the camera back. The most common cause of edge fogging is light leaking in through the film canister, which happens over time if the unused film is not stored properly. If this is a high ISO film(400 and up) and you load your film into the camera in a very bright enviroment that can also cause film fogging. Try a brand new roll of film and if that doesn't resolve the problem I would have it looked at by a camera service technician.

Agent Allan
Go Ahead. Use Us.

Apr 15, 2008 | Nikon F80 35mm SLR Camera

Not finding what you are looking for?
Bushnell NorthStar 78-8890 (300 x 90mm) Telescope Logo

294 people viewed this question

Ask a Question

Usually answered in minutes!

Top Bushnell Optics Experts


Level 3 Expert

82322 Answers

Brad Brown

Level 3 Expert

17473 Answers

George Merkley
George Merkley

Level 2 Expert

190 Answers

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

Answer questions

Manuals & User Guides