Question about Tasco 750 Monocular Microscope

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Optic lens tube separation

We have 20 monocular Leica BME scopes. Several of them have had the tube that holds the optic lens separate from the rotatable head of the microscope. What is left is a black fitting with a square glass peice in the bottom. Is this a friction fit or a glued joint? They are very loose and no longer snug up. Would you suggest a glue that can be used or is there a better fix to this problem?

Jim Langhus

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Hi There,

I understand your problem and I would
Recommend stud-fix by Loctite, making as sure as possible that the tube occupies the exact same place as it did before removal (at right angles to the optical axis)
If I can be of further assistance, please do not hesitate to contact me.


Posted on Mar 10, 2008


Optic lens tube separation - image.php?productid=16148Sir,your microscope tube with the eye piece is screw joint with microscope body. Rather part is friction fitted as well as there is a proper place to mount can do the gluing but first of all be clear that part should be not a movebale part other wise you will have dificulty for fine focusing.
for the further quotation dont be hazitate,

Posted on Feb 19, 2008

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The tube joint was a friction fit that had become loose. Most of the time it is a screw joint which is why I was confused. We put some electrical tape around the inside portion of the fitting and the tube fit snugly down over it. We'll have to wait and see how long it lasts.


Posted on Feb 14, 2008

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1 Answer

What is a Monocular?

A monocular is a miniature, low powered telescope or spotting scope which you hold in your hand like a binocular but use with one eye like a telescope. A monocular shares characteristics with both binoculars and spotting scopes, but is much smaller than either. Size, then, is really what a monocular is all about. Some monoculars are no larger than your thumb or thicker than a good ink pen and any monocular will slip easily into a pocket or a purse. When a Spotting Scope or a Binocular, even a compact, is too large to take along, there is always a monocular. There is no excuse for leaving home without the monocular.

Apr 04, 2018 | Optics

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Turns on but cannot see anything

Hello, there could be a number of problems but 90% of the problems with these Russian manufactured monoculars, binoculars, scopes is the the image intensifier tube. First they are cheaply made, they don't taken much abuse, and if any bright light such as, street lights, car lights, turn on the NV monoculars during the day light hours could and would total damage these Russian manufactured tubes.

I hate to tell you but there is a good possibility that the image intensifier tube is bad, sorry. Night Owl Optic and many other US companies use cheap Russian manufactured night vision devise to sell; of course, they make a huge profit on these NV devises.

There are a lot of countries in the world that manufacture NV monoculars and other NV devises. Some are good and most are just slap together.

If you want a good night vision monocular be prepared to pay top $$$ for them.
Made in the USA, Europe, England, and even in China.

List it on eBay as Night Vision Monocular and under condition: broken for parts.
I wish you luck. GB...stewbison

Oct 19, 2011 | Night Owl Optics Optics

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Didn't used 1 1/2yrears woudn't turn on

Hello, sorry that you moncular will not turn on. It seems that these Russian manufactured monocular, binoculars, scopes have really cheap intensifier tube in them. They just wake up then die. It's cost prohibitive to have it repaired because Night Owl will not sell parts for NV devises to any one. Look on eBay and they are quit of few of this NV monoculars for auction and also for parts. The image intensifier tube is 90% of the cost of any NV devises. GB...stewbison

Sep 07, 2011 | Night Owl Optics Explorer NOCX3 Monocular

1 Answer

Real hard to see & not focused 5 feet in front of whatever trying to look at.

Try this, take both lens out. All you have to do is just unscrew the lens. Use a very good optic lens clean with anti-static charging elements in the clearner. Only remove lens in a room semi free of dust, mites--little monster that live in the carpet, flaky skin, pet hair, etc. If it is dust inside of the NV devise, use a computer air spray to clean the inside. Assembly in reverse order. stewbison

Aug 06, 2011 | Night Owl Optics Explorer NOCX3 Monocular

1 Answer

I just got this from a panw shop, it doesn't work it need a battery and I take it it also need a charger for the battery, where is the best place to get one of each, can I get one from the factory, along...

OK, first it doesn't need a charger. Most charger are external types. Battery, it probably uses one (1) CR123A which is a three (3) volt battery, or two (2) "AA" batteries which are rated at 1 1/2 volts each. Batteries you can get them every where, Radio Shack, WalMart, Kmart, Sam's, Walgreen's, One Stop Batteries, etc. The average life for the CR123A is about twenty hours of use, and it probably the same for the double "AA's.

Here how this Famous Trails End NV FT300 Monocular work. The monocular has two button-one for on/off, and the other is for the IR luminations.

.WARNING!!!! This a night vision devise will be used at Night! Don't taking a look see at bright lights or using the night vision devise during the day... Light time.

Now the monocular has a build in shut off for to much light entering the image tube. Don't try it, it works. The more times the monocular NV is subjected to bright lights the more it destroys the thinly film cover over the plate. One it gone, new image intensifier tube and the cost will be about $200 plus shipping and handling.If you just have to take a look see in the monocular. Get a couple of optic lens cover that snap on. The front Optic cover drill about 1/16 in hole in the center of the cap, that it. Now you can take the back lens cover and remove it. Turn your monocular on and take a look through the eye piece. It should be green, if not, take it back the Pawn Shop and ask for a refund.

If you don't have lens covers that OK too. Just get in dark room and point the monocular at one of the corners. Don't point it any lights. It will turn green. I will advise you don't test the auto shut off. You don't know who had first, second or even third time, how it was handed and used. stewbison

Feb 06, 2011 | Famous Trails Ariel FT300 Monocular

1 Answer

I have a Ariel FT 300 it will not turn on

Hello. It seems these Russian made monocular won't operate aftera while. It is a common ocurrance with these and others NV devises.

It probably the image intensifier tube that is bad. It would be cost prohibitive to have it repair by Famous Trail Optic. I am take a guess here. The cost would be about $100 + shipping to and from, and about $200 for a used Russian image intensifier tube. New tube will be approx. $400.

Try if you have their address and phone give them a call. They might give you a deal. Normally what happen they will tell you it is none repairable but they will give you a great deal on another Russian made monocular. I'm really sorry for you. GB you...stewbison

Feb 04, 2011 | Famous Trails Ariel FT300 Monocular

1 Answer

Need instruction manual on what I BELEIVE TO BE NIGHT VISION BINOCULARS

Here we go. Sorry that you waited 7 months or maybe not. Here Meade's Instrment/Optics owner manual for your Meade NightView NV Monocular. If you have two eye pieces to look through and two optic lens on the other end then you have a binocular. But if there is only one eye piece and one Optic on the other end it a Monocular Bi--2, Mo-- Here is Meade web site for your monocular.. GB....stewbison

Jan 26, 2011 | Meade NIghtView NIght Vision Monocular

1 Answer

How far is the IR illuminator good for and is it possibl to change to a bigger LED inside the uit? Is this gen I or 2 tech?

Hello, yes you could but the scope is limited the clarity of the image intensifier tube with effective range from 0 to 80-100 yards max and if you get this out of it. The only difference here is the 1,5 85mm lens. Most lens are 45 or 50mm. So with the 85 mm lens which lets in more ambient light and with a brighter IR illuminator you might get a 100 yards or more. You have a Russian manufactured monocular the Famous Trails has installed their name and logo. You have a generation 1 ex-soviet union image tube. It painted green like the Soviet military. Sorry man.. GB...stewbison

Jan 01, 2011 | Famous Trails FT1200 Monocular

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My night vision scope will not turn on. My LEDs work but you can not see anything in the lens. Yes the cap is off. I tried new batteries. It has very few hours of operating time. Help!

Hello, Welcome to the world of Russian night vision system. That is right, Night Owl Optics Cyclops NOCC3 is manufactured in Russian. The biggest problem with these monocular and binoculars and even scope is that they use cheap 1st generation Russian image tubes and everything else. It would be cost prohibitive to have it fixed, that is, if Night Owl Optics will fix it for you. Hint: Auction it on Ebay as night vision parts. Sorry, GB...stewbison

Nov 30, 2010 | Night Owl Optics Cyclops Compact NOCC3...

1 Answer

No view

lenscap? if this is a manual mirror version (light is provided by reflection from a swivel mirror under the sample. this mirror needs to be in the correct position for you to see. also check your optic selection, (switch to a different lens) see if this helps, (you may also not be selected properly)

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