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My astronomy project:
Big Binoculars


Binoculars 25x100

  1. Binoculars
  2. Binoculars mount
  3. Binoculars mount another idea
  4. Test rig

1: Binoculars

When I was out on a cruise on Baltic Sea I got a message that a package was waiting for me. Later when I got home, I immediately went to the post office and picked up the package. See what happy a man could be when receiving new toys :-)

Package with binocular

My earlier binoculars was a 8x21, very easy to bring with you on travels and pretty good optics too. But as you see of the size of the box above this must be something bigger.

Binocular 25x100

This is a Helios 25x100 binoculars, it's like two 100mm refractors!

Compare binocular 25x100 with 8x21

Compare the sizes of the two binoculars, 25x100 vs 8x21. About 8 times more expensive and 20 times more heavier!

I have never been a fan of visual observation, but now I'm curious to give it a chance.

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2: Binoculars mount

This binoculars has a weight of 4.5 kilo and can not be handheld. It must have a sturdy tripod or something similar to hold it stable. My photo tripod you see above is too weak.

Pier

Earlier in my pier project I already had a big binoculars in mind so I built two piers. Now it's just the problem how to mate the binoculars together with this pier.

EQ2 mount

Maybe I can use this EQ2 mount hat I just have bought, or I build DIY parallelogram mount to hold it.

Something like this:

I think this binoculars will have a field of almost 3 degrees, about the size of Andromeda galaxy. After a test outdoors I'm impressed of the optical quality, because this is just a very cheap instrument and I didn't expect very much from it. Where there is heavy contrast you can see purple fringes, this is not an APO binoculars of course.

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3: Binoculars mount another idea

After a lot of reading at forums I got ideas how to build my own mount to my big binoculars. This is my interpretation of how it could be done. First I have to solve how to rotate the binocular mount easy around the pier. This is what I bought to handle this problem, a caster wheel.

Caster Wheel as a part of binoculars mount

This caster wheel has a double roller bearing. My idea is to mount this with an extension on my pier. One problem, when mounted upside down like this the roller bearings are not protected from rain and water, I have to fill it with a lot of grease.

Binoculars mount

No need of the wheel, here I will mount the arm that holds the binoculars. If I need two arms there is space for the second arm too. The U-gap is 43mm.

Binoculars mount

This is how it will look if I got it to work. If I want a parallelogram mount it's easy to built it like that too, just ad one more arm. The green ring is a counter balance weight, about 10 kilograms.

With this construction I don't get the fine adjustment I thought about with the EQ2 mount. I don't have any experience if this is a must with 25x magnification. But this is easily to built so I can just built it and test it. I plan to have something like a handlebars from a bicycle to maneuver it.

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4: Test rig

Before I spent to lot of time on this I have to do a test rig so I get a felling about the dimensions. First take a look at the pier again.

Binoculars mount

Still the hood in place and protected against weather.

Binoculars mount

No damage to it during the winter.

Binoculars mount

This is about my idea how it shall look. It will be used when standing up. Binocular at the left and balance weight to the right.

Binoculars mount

Close up of the caster wheel. I need a distance between that and the pier to get it high enough.

Binoculars mount

Now in the beginning the balance weight will just be a buck filled with stones.

Binoculars mount

This wooden part will be replaced with one in steel. It will hold the binocular with a standard 1/4" camera mount bolt.

Binoculars mount

As it now it could be difficult to aim it at higher altitudes. I think I must have a bent at the end of the arm. If I built it as a parallelogram it will not be a problem.

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