- GERMAN ORIGINS #1

- GERMAN ORIGINS #2

- GERMAN ORIGINS #3

- GERMAN ORIGINS #4

- GERMAN ORIGINS #5

- GERMAN ORIGINS #6

- JAPANESE ORIGINS #1

- JAPANESE ORIGINS #2

- JAPANESE ORIGINS #3

- JAPANESE ORIGINS #4

- JAPANESE ORIGINS #5

- JAPANESE ORIGINS #6

- JAPANESE ORIGINS #7

- INTRODUCTION #1

- INTRODUCTION #2

- DISTRIBUTION #1

- DISTRIBUTION #2

- DISTRIBUTION #3

- DISTRIBUTION #4

- DISTRIBUTION #5

- DISTRIBUTION #6

- DISTRIBUTION #7

- DISTRIBUTION #8

- DISTRIBUTION #9

- FUN ANALYZING BRANDS #1

- FUN ANALYZING BRANDS #2

- FUN ANALYZING BRANDS #3

- FUN ANALYZING BRANDS #4

- BINOCULARS BY BRAND A-B

- BINOCULARS BY BRAND C-G

- BINOCULARS BY BRAND H-M

- BINOCULARS BY BRAND N-Q

- BINOCULARS BY BRAND R-S

- BINOCULARS BY BRAND T-Z

- PHOTO GALLERY #1

- PHOTO GALLERY #2

- PHOTO GALLERY #3

- PHOTO GALLERY #4

- PHOTO GALLERY #5

- PHOTO GALLERY #6

- PHOTO GALLERY #7

- PHOTO GALLERY #8

- PHOTO GALLERY #9

- PHOTO GALLERY # 10

- PHOTO GALLERY # 11

- PHOTO GALLERY # 12

- VINTAGE ADVERTISING #1

- VINTAGE ADVERTISING #2

- VINTAGE ADVERTISING #3

- VINTAGE ADVERTISING #4

- VINTAGE ADVERTISING #5

- VINTAGE ADVERTISING #6

- VINTAGE ADVERTISING #7

- VINTAGE ADVERTISING #8

- ORIGINAL BOXES #1

- ORIGINAL BOXES #2

- CAN YOU REPAIR THESE?

- REPAIR SEIZED OCULARS IF

- COLLIMATE AND REPAIR CF

- MORE REPAIRS #1

- MORE REPAIRS #2

- MORE REPAIRS #3

- IDENTIFY THIS

- SWAP SHOP & MISC

- MISC #1

- MISC #2

- BIG & SMALL #1

- BIG & SMALL #2

- BIG & SMALL #3

- BIG & SMALL #4

- BIG & SMALL #5

- BIG & SMALL #6

- BIG & SMALL #7

- BIG & SMALL #8

- OTHER BINOCULARS #1

- OTHER BINOCULARS #2

- OTHER BINOCULARS #3

- OTHER BINOCULARS #4

- OTHER BINOCULARS #5

- OTHER BINOCULARS #6

- OTHER BINOCULARS #7

- OTHER BINOCULARS #8

- OTHER BINOCULARS #9

- OTHER BINOCULARS #10

- OTHER BINOCULARS #11

- OTHER BINOCULARS #12

- OTHER BINOCULARS #13

- OTHER BINOCULARS #14

- OTHER BINOCULARS #15

- OTHER BINOCULARS #16

- BINOCULAR CATALOGS #01

- BINOCULAR CATALOGS #02

- BINOCULAR CATALOGS #03

- BINOCULAR CATALOGS #04

- BINOCULAR CATALOGS #05

- BINOCULAR CATALOGS #06

- BINOCULAR CATALOGS #07

- BINOCULAR CATALOGS #08

- BINOCULAR CATALOGS #09

- BINOCULAR CATALOGS #10

- DATA BINOCULARS BRANDS

- INDEX #1 (A-L)

- INDEX #2 (M-Z)

- JB JE MFGR. CODE LIST

- TRADEMARKED LOGOS

Text Box: VINTAGE MINIATURE BINOCULARS

Japanese External Reverse Porro Prism Binoculars. Website MUSEUM

 PHOTOS

 MARK OHNO

Collimation of Miniature Binoculars. Kollimation der Prismen der Miniaturferngläser. Collimation des Prismes des Jumelles Miniatures. 小型双眼鏡 のプリズム調整 Коллимация миниатюрных бинокль. Kollimering av Miniatyr Kikare. Colimación de Óptica Prismáticos en Miniatura. Collimazione di Binocolo in Miniatura.

In simple terms, and as I understand it, binocular collimation is the positioning (alignment) of the prisms relative to each other such that the optical images of the two sides of binoculars are superimposed, and as a result the user perceives a single image. When the prisms are not aligned, one sees a double image or a ghost image from the less dominant eye, as simulated by my friendly local raccoon in the left hand picture above. It is not unusual for miniature binoculars to have been dropped over the years, and some percentage of both individual focus and center focus models show up with collimation issues. Also the prism positioning screws may simply loosen up over the decades. It is often possible for a collector to engage in a successful remedial correction by following the procedures below. This is sometimes referred to as conditional alignment collimation. Another more sophisticated instrument based collimation or 3 axis collimation makes the optical axis of both barrels parallel to the hinge, but this adjustment is beyond the scope of hobby remediation.

Not collimated (just hungry)

  Collimated.and still hungry.

Text Box: I classify these repairs as intended to allow a collector to reclaim operational function, as opposed to some higher standard of professional and expert restoration intended to replicate a factory new specification. Collimation by eye (conditional alignment/image merging) is not the same as collimation using optical instruments(3 axis collimation). However, non functional binoculars in a collection can usually be improved quite a bit at no cost. But if you follow my directions, and you repair your binoculars, and then take them out to watch for 12 interrupted hours for an ivory billed woodpecker to appear at your bird feeder ...and if you then subsequently get a headache...it is not my fault. (In that instance it is clearly the fault of whatever sleazy politician you dislike!)

The vast majority of these miniature binoculars have prism positioning or adjusting screws, but a few don’t.

1920’s Fata Morgana binoculars have prism adjusting screws.

Screw hole typically filled with dirt or intentionally filled with wax.

But these economy Omega binoculars do not have prism adjusting screws.

1950’s RKK binoculars have prism adjusting screws.

Text Box: 1
Text Box: 2

The process of shifting the prisms in the direction of the arrow is to: unscrew # 1 to create room, and then screw in # 2 to move the prism. Normally this would be done with the prism cover in place (it is shown here to demonstrate what is actually occurring). You normally move the prism a little and then look, then repeat. You may run out of movement on one prism. Be gentle: if you run out of room for the prism to move and continue to tighten the screw you will chip the prism.

To address this issue (right-left), I would move the left horizontal prism right, or the right horizontal prism left. You shift the prisms the same way as the image shift you desire.

To fix this double image, I would move one of the vertical prisms up or the other down.

Prism screw.

There are 8.

Avoid completely removing the Prism screws. The result is a tiny easily dropped / lost screw you cannot replace.

Cleaning Prisms. Säubern der Prismen der Ferngläser. Comment Nettoyer les Prismes des Jumelles. プリズムを清掃してください. Rengöring kikare Prismor. Limpieza Prismas Prismáticos en Miniature. Praticanti do Pulizia.

These small binoculars are not particularly well sealed. So you will sometimes or often encounter ones that have dirty internal prisms and lenses that you might want to clean. Here is how to clean the prisms.

Remove the two screws holding one of the prism covers on.

These screws are small, so remove them over something that will catch them when they fall. Which they will. They can sometimes be retrieved out of the rug with a magnet.

I like to sight on a light fixture 20 feet away to make adjustments, as it ghosts particularly well and in all directions. Plus it doesn’t eat my seed so fast.

The prism covers fit down into the binocular frame, so you may have to rock them a bit to pull them free. There is a spring in the prism cover. The first two types shown sometimes appear on late binoculars, and tend to stay in the cover, which is nice. But the common one is the last type, which usually falls out when you remove the cover. In fact this one dropped off my finger just as I snapped the picture with my other hand. Even though I saw exactly where it landed, I still couldn't find it. And being non magnetic, the magnet trick didn’t work either.

If you remove a prism to clean the underside, try to mark on the frosted part with a pencil so you know what side went where.

This is how the spring goes. But the prism cover usually knocks it off when you try to replace the cover  (you will hear the spring rattle in the prism cover). If I get a couple unsuccessful attempts at replacing the cover, then I will break down and stick a bit of double sided tape on the flat of the spring and stick it into the prism cover.

Most prism covers will go on with either orientation. What is the likelihood of putting them back the wrong way? Well it’s a 50-50 shot to start with... and if you are distracted by the spring being knocked off 3 times… and happen to be holding them upside down at the time... well then you will probably be embraced by some equivalent to Murphy’s law. (Sods law in the UK, LEM/ Loi de l’Emet ê ment Maximum in France, SNAFU in US military culture, Finagle’s law, Sturgeon’s law, la Ley de Murphy in Spanish speaking countries, Pravno Murphiego in Poland, закон подлости in Russian, and 失敗 する可能性のあるものは、失敗する in Japanese. People may not agree about much, but attitudes to the probability of things getting screwed up are universal.

Repair Center Focus Binoculars: Freeing The Seized Right Side Adjusting Ocular. Fernglas Mitteltreib, Rechte Seite Okular. Le Mécanisme Saisi Pour Focaliser, Côté Droit Oculaire. Riparare il Binocolo di Messa a Fuoco Centrale: Libare il Lato Destro Preso a Regolazione Dell’oculare.

On most center focus binoculars , you focus by rotating the center wheel until the left eyepiece is in sharp focus, then if necessary, you turn the right hand active diopter ring to bring the right side into sharp focus. This focuses the instrument and also sets it up for the any vision difference between your left and right eyes. Just as the independent focus oculars often seize on independent focus models, the active right ocular on center focus binoculars often seize.

On center focus binoculars, one diopter ring is active (usually the right side one) and the other ring is inactive (a fixed or free spinning diopter ring). The way to tell which one is active is that the active diopter ring normally has numerical markings and the inactive one normally doesn’t.