Question about Steiner Merlin 448 (8x42) Binocular

Open Question

Where are the collimation screws on Nikon Sporter 8X36 binos?

I dropped the binos and it caused the prisms to loose their collimation. Usually, the solution is to replace the binos, which I have, but these were very good and I'd like to take a run at collimating them myself. Just need help getting started. Thanks, Greg

Posted by on


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

10X40 monocular. Prism is loose and has come out of place. 2nd one I've had trouble with. How do I realign the prism?

I ASSUME this device has collimation screws on the side of the barrel-- if it does not then the prism cannot be aligned.

If it does have collimation screws then hold the small monocular up to a lighted window and adjust the screws until you get a ROUND circle of light-- if you see a "catseye" light circle the prism is not collimated.

Aug 30, 2011 | Barska Optics Optics

1 Answer

I can't focus the binos anymore looking through both lenses at the same time, it's distorted

You have asked about what is one of the most common binocular problems. I hope that you don't mind if I paste my generic answer below as there's no point in reinventing the wheel. If the answer does not provide a solution then please state your exact Nikon Action model and add any extra details which may help.

Your binoculars either have a bent or broken yoke assembly (the bit which carries the eyepieces) or one or more prisms have came unseated.

The first repair involves replacing the entire yoke assembly: the part is expensive in comparison to the retail cost of a new pair of binoculars and with labour charges on top is not usually a cost-effective repair except on really high end expensive models and you can buy a brand new pair of Nikon Action binoculars for less than GBP£90.

The second repair is straightforward and fairly quick for anyone with the right collimation equipment, but the screw(s) need to be secured with thread-locking liquid afterwards.

I hope you manage to use this information to fix your binoculars or at least that it assists you to choose your next course of action. Please take a moment to rate the free answer I have provided for you and any testimonial which you might wish to add is always welcome!

Oct 05, 2010 | Nikon Action Binocular

1 Answer

Winchester WL-7350WR 7X35 binos out of aligngment/colimation- need to re-adjust. Don't know if there's any objective lens alignment method, but I have found the rear adjusting screws for the prisms under...

There are another set of adjusting grub screws not just these! If you need to collimate them then you will need to adjust the correct ones to avoid what is known as "conditional collimation" where they are only good for people with the same IPD (interpupilary distance). If you feel confident that you can do this fine. But first is there any leaning field obvious? Using one side at a time and looking at a horizontal or vertical object (like a flagpole) show any lean when compared to the visual appearance? If it does then you need to send them to a service centre for correct alignment.

Feb 23, 2010 | Winchester Optics

1 Answer

We had a fire and my binos got smoked inside. I took apart the front and cleaned the prisms in front and lenses. How do I access the back prisms? How do i get the cover off the prisms at back of binos.

most prisms have coating on their air to glass surfaces. Chances are you have already degraded their original quality, even with the smoke gone. From past exp. you will be better of getting another bino...

Feb 16, 2010 | Bushnell Legend 19-1050 (10x50) Binocular

1 Answer

I see two immages. I can not get the immage to become one. I am using a Nikon 8x21 6.3deg Sprint II

this is usually caused by the bino's being dropped or banged knocking the internal prisms out of alignment.

Oct 06, 2009 | Optics

4 Answers

Dropped new Celestron Skymaster 15x70 binoculars. Nothing appears broken, but now have two images. Can I repair this. and how? Thanks. Dan

Don't "unscrew" the binoculars. there are no user servicable parts inside. the collimnation adj screws are beneath the rubber boot just under where your index fingers rest when looking through the bino's. use a jewelers screwdriver to tease the boot up and stick a small nut or something in. then put the binos on a stable surface and play with the screws a bit while watching the images. you can get them pretty close this way.

Jul 21, 2009 | Optics

2 Answers

Double tunnel vision

I'm assuming that you have the dioptre set correctly for your eyes.

Normally this is caused by a collimation error, caused when one (or both) of the prisms move, even by a small amount.

You will need to get this repaired/serviced as this is not a DIY problem. (Unless, of course, you have a collimator lying around)

Mar 21, 2009 | Optics

1 Answer

Travelite 10x25

well lets see..if i was you which im not i would take my dog for a nice walk on the ocean look at the sea and say bye bye binos.aaah the lobsters and crabs will have a nice time trying to get a single image.ok if you really want to have them fixed. send them for an estimate to a good repair shop...that should only take about 5 weeks and cost you $30.00 for shipping and an estimate.and they only cost $20.00

May 29, 2008 | Nikon Travelite V Binocular

1 Answer

Pattern appeared on interior of lens/prism

What you see is fungus . It comes off very easily BUT if allowed to grow it will damage coating and glass because the organism releases hydrofluoric acid. So the key is to clean as soon as possible. You can do this your self but be careful around the prisms because even slight movement here will upset your collimation ( will get 'double image')and then you will need to have your nbinocs aligned properly.

Sep 09, 2007 | Canon (12x36) IS II Binocular

Not finding what you are looking for?
Steiner Merlin 448 (8x42) Binocular Logo

Related Topics:

92 people viewed this question

Ask a Question

Usually answered in minutes!

Top Steiner Optics Experts

Joe Lalumia aka...
Joe Lalumia aka...

Level 3 Expert

3186 Answers


Level 3 Expert

102366 Answers

Mark Campeau

Level 1 Expert

44 Answers

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

Answer questions

Manuals & User Guides