Nikon J-87 Binoculars Worth Repairing?
#1 
Posted 21 October 2007 - 05:36 AM
how-do-you-do folks
simply plant these at a car boot sale, paid £fifteen Great britain for them and was wondering if anyone knows a scrap about them.
they are 7x50's with individual focusing ep'southward are sealed. they're marked on the correct side J-B7, NIKON, 7x50 fov vii.3.
left side is marked "nipon kogaku tokyo 704171
i have no idea if there nitrogen sealed only the await to be at least sealed and h2o proof, they are in almost mint condition autonomously from some slight clouding of the prisms as seen through the objectives. collimation is very slightly out only not noticable.
i have heard the disignation j-b7 somewere and though it was a civilian designation but not certain?
whatever help with these would be nice
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#ii
Posted 21 Oct 2007 - 06:30 AM
some other angle. one matter i practice discover with these is the absence of dimed edges or the grey cut off you get with bak7 prisms, the exit pupil when veiwed at a altitude looks clear right to the border unlike my harmonys which do have bak 7, practice these have bak 4 prisms?
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#3
Posted 21 October 2007 - 06:55 AM
i dont know what blazon of drinking glass is used merely i cant see any cut off
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#four
Posted 21 October 2007 - 06:56 AM
unlike the harmony'southward
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#5
Posted 21 October 2007 - 07:17 AM
JB 7 = Japan Kogaku Kogyo Co. Ltd. = Nikon
See
http://home.europa.c...cope/jbcode.txt
#6
Posted 21 Oct 2007 - 07:23 AM
Mark ,
Equally Claudio pointed out , JB7 simply indicates the manufacturer equally being Nikon .
If this specimen is as good as it looks , you've got yourself a real deal at £15 !
Regards , Kenny
#7
Posted 21 October 2007 - 07:46 AM
hi kenny
they do seem to be in exellent lodge, the just thing that bothers me (and i new this earlier i parted with my cash) the prisms are slightly fogged and at that place is a slight rattle in ane barrel which past the looks of one spiral (very slightly burred) may have been taken at least partialy apart on one side. the fact that these are sealed makes me nervous about taking them apart, but in order to repair/make clean them i may have to.
maybe a desiccant placed inside earlier reasembely will stop fogging upwards when sealed once more?
does anyone know what blazon of glass/ coatings these accept they look fully coated and like i said i cant run across whatsoever cutting off in the prisms
#8
Posted 21 October 2007 - 08:33 AM
You noticed some misalignment of the axes + some rattle in one barrel: I remember that there could be a loosen prism. Could y'all quantify how great is the misalignment?
Maybe the rattle could exist made by one of the objectives that is slightly loosen. As collimation is most certainly achieved with eccentric rings and eccentric objective cups, their fifty-fifty slight loosening would cause misalignment.
Regards
Claudio
#9
Posted 21 October 2007 - 09:21 AM
hello cladio
i retrieve its a prism, the rattle is very slight though. miss alignment if i tin can explain it, when veiwing a stone that is about 3inchs big at 30 metres distant one image seems to be about 2 inchs higher and correct or you could say left and lower. they are adjusted with concentric rings and i really nead a tool to do this but not knowing which side is out wouldnt know which side to corect. if one prism is loose securing it my put it back in alignment.
does any ane know if a tool i nead to arrange them is bachelor and what its chosen?
it looks like im going to have to "go in" and have a expect, i'll but have to reseal them with a desiccant stock-still within
#10
Posted 21 October 2007 - 09:49 AM
i found the sorce of the rattle, one of the eps had a loose lens inside,the metal collar marked with the red arrow needed to exist tightened. the prisms are sound.
now there opened i may likewise make clean the fogged prisms. there is room for a desicant pill inside and i have some sealant.
hands upwards anyone who'd like to endeavor this with their £500 bins, i only paid £fifteen and im pretty nervous virtually messing things upward so please dont tell me im an idiot ... i allready know 
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#11
Posted 21 Oct 2007 - 11:08 AM
Before reading your new postal service I had prepared this text:
<< To know if a lens is rattling put a finger on the objective lenses and milk shake the binocular. If the rattle disappears…
Information technology seems that at your IPD the optical axes take a vertical step of about 5 or 6 arc minutes. This misalignment that has to exist multiplied by seven (the magnification) to know the mistake in the credible FOV, which says how far from the tolerated fault it is. Tolerated vertical step is 15 arcminutes in the AFOV (sometimes a bit more), that is already a noticeable amount of misalignment. Your binocular seem to show a vertical step of 35 arcminutes or more than.
If you want to enjoy that binocular you should fix it.
You assert that if you secure that prism the binocular would get collimated again.
It would exist nice, merely is as well dainty to be true.
You don't know whether the loose prism is a rear prism or a front end prism. Thus you don't know whether you accept to detach the glass starting from the objectives (which makes to lose collimation) or from the eyepieces.
The recess of the prism has non its verbal size, then y'all should observe the correct position, in order to become the two prisms 90° to each other, and to go at the same time a rough collimation.
Then almost surely yous should meliorate the collimation by adjusting the eccentrics.
Finally, if nothing has been damaged (it is easy!) and if y'all have institute an acceptable alignment, what you would have is a binocular that still needs to be cleaned. And so only half of the work would have been done.
Y'all are lucky, y'all live in the U.Yard.: there is a lot of good technicians who know what is a binocular overhaul, and the cost should be affordable. In about countries of Europe a good technician is condign rare.
I think that the game is worth the candle and am sure you will love that binocular.>>
Then subsequently your last message I added:
<< I fear that the misalignment doesn't depend on the loose lens of the eyepiece.
If prisms are ok, peradventure 1 of the objectives shifted a bit. It's simply a hypothesis.
Please notation that you can cannot get in to clean adequately the hypotenuse of the prisms without taking them downwardly, loosing irremediably the collimation. Please clean gently only the half hypotenuse that is in front end of the field lens of the ocular.>>
But now that you have added the flick the only thing I can say is:
I hope you wrote something on the prisms in society to find again their position in the right identify and in the right direction.
Look for a good technician and give him everything.
Otherwise what you would become in the best instance is a conditional collimation.
Claudio
#12
Posted 21 Oct 2007 - xi:27 AM
hi claud
i did mark the prisms before removal and i have a process for cleaning that has worked in the past, i did the same to my harmony 7x50'south last calendar week and when reasembled they were notwithstanding aligned as before and spottless inside.
the prisms sit very snugly in at that place cut out resesses... at that place simply is no room for prism lean and when asembled without ep'due south and objectives this tin be checked and seen
i've done this a few times now and find it very enjoyable to practise, i purchase old bins that demand repairing very cheaply at boot sales ect so spend many an hour learning how they go together and along the manner 9x out of x i end up with a dandy ready of bins that cost me next to zilch. i simply wont pay someone else to exercise something i enjoy doing myself even if they are better than me at it.... how else am i to larn?
claud you seem worried for me! 
#xiii
Posted 21 October 2007 - eleven:43 AM
Very nice binoculars, Marker! Congratulations on the find!
Continue usa posted equally to how your project comes out. 
#14
Posted 21 October 2007 - xi:52 AM
Those are very expert binoculars at a very good price. Excellent condition as well.
I had a JB-7 but it was an 8x30mm. Very sharp views and built very well - typical Nikon quality.
#xv
Posted 21 October 2007 - eleven:59 AM
I was worried for the Nikon more than than for y'all. 
I was fearing this was the first time you were disassembling a binocular, and that Nikon is not precisely a guinea pig. Happy to hear that you enjoy the overhaul!
<< the prisms sit very snugly in there cut out recesses... there simply is no room for prism lean >>
I am talking of small-scale fractions of millimetre that allow micro shifting longitudinally and laterally. This is ever possible, unless the recesses are punched.
Claudio
#16
Posted 21 October 2007 - 12:09 PM
the prism resseses were punched and i was very carefull to mark every thing before removing them. i have done this with a pair that had plenty of roon effectually the prisms the type that are when aligned cemented.... took me all mean solar day to get them corrected, they were the starting time pair i had a go at and i still use them today.
and thanks guys they were a steal, the guy wanted £fifty for them but after pointing out the fogged prisms he dropped to £xxx... i and then demonstrated the rattle they dropped to £twenty... conditon of the case dropped them to £15, i left very rapidly after exchanging my greenbacks grinning all the way dwelling house 
#17
Posted 21 October 2007 - 01:50 PM
i must acknowledge im however a piffling curious well-nigh the glass used in these bins.as i said there are no "cut offs" visable as with bak7 glass prisms yet these are quite old bins. i did find something near ED or E something glass beingness used in some highend older bins, is this anything like the modern bak 4? the coatings on them is also a purple colour as apose to the blue i normally see on older bins. i did go to use them before down on the beach and they are astoundingly sharp and clear, there was some "hazeing" when looking towards the sun(Not AT THE Sunday, that is very dangerous)due to the fogged prisms, but yous can see they are very adept quality, more than so than the harmony 7x50's i bought earlier
#18
Posted 22 October 2007 - 01:38 PM
Squeamish find Marking. On the rare occasions I exit to motorcar boot sales I don't come up across a notice similar this!
Usually it's only Prinzlux rubbish (there was a pair of Prinzlux 7x50s on sale in a charity shop here for £12).
#nineteen
Posted 22 October 2007 - 02:26 PM
I as well have been checking out binoculars at car kicking sales for about xx years , on and off , and have never come across any every bit nice as this Nikon vii x 50 .
There's an almost INCREDIBLE amount of rubbish out there though -- I often wonder where people must have bought them all from in the first place , and what they can perhaps have used them for !
A rather strange thing about binoculars is that apart from people like united states of america , inappreciably anyone ever seems to mention them , or admit to owning any , yet there are probably relatively few households in England which DON'T have the odd pair of soe kind or other , hanging around somewhere , even if almost forgotten almost .
Kenny
#20
Posted 22 October 2007 - 05:twoscore PM
i visit machine boot sales quite frequently but its but recently that i've been looking for binoculars in particuler. what amazes me is the toll sometimes asked for really bad bins. i was very lucky with the nikons. i but had £10 on me and the guy wanted £50 he plain didnt know the commencement thing virtually them and probably inherited them from a grandfather or somewere. finaly got him downwardly to £fifteen simply had to observe a greenbacks machine (20min walk away) imagine haveing em for a tenner!
of corse they did take a few things against them ie fogged prisms rattely ep lens (fixed, was just needed a tighten)and of corse me, but appart from that they are in superb status and expect new.
problem is i cant aid only take things apart. allthough i experience bad for doing then with these, i get the feeling i should have found an adept to fix these bins from the views of some 
but there my bins and i "want" to be able to prepare em myself, i have the number of a guy in plymouth who does fix bins... i may ask for his help with alighning them if there out but would rather find the tools/equipment and learn to do it myself. there is no blitz and im learning a little more each twenty-four hour period
#21
Posted 22 October 2007 - 09:55 PM
The skilful erstwhile days of such sales are only near over on this side of the swimming unfortunately. It'due south getting harder and harder to become deals like that from strangers hither.
#22
Posted 23 October 2007 - 01:25 PM
it aint easy here either. yous've got to go out at that place ofttimes and wade through all the dross, i've been to quite a few boot sales in the last few months and this is the first time i've seen a pair that were any good. bought a few old 10x50'due south for peanuts that needed cleaning but they not keepers and'll end upwardly on that webbay.
car boot sales here are dying down a flake now as winter arrives but in that location are still a few and im trying to get to every bit many as time permits.
i did find a pair of swifts 8x40's that had seen far better days so didnt bother with them... if i can find a prissy set again i'll sure permit you know.
i got a quote for cleaning the nikons but it was so much im going to do it myself, i managed ok with the harmonys just the nikons are a bit special and i want to be as carfull as possible with them, simply any tips would be great.
#23
Posted 23 October 2007 - 07:54 PM
Not certain where a 'auto boot sale' sale takes place, they didn't do that when I lived at that place. Here we have 'garage' or 'm' sales at your own home. You do see the odd binocs, but I have a friend who always asks if they have any binocs. They don't accept them out just frequently they'll say "Well we take those really big ones Granpa brought back from the war, we never utilize them, I'll go find them" He's picked up some gems doing that.
BTW those are a existent find.
#24
Posted 24 October 2007 - 01:34 AM
hullo brentwood
we accept them here all the time there very popular in england. basicaly its formal veneu held in a field, carpark somewere similar that folks bring all at that place unwanted stuff in the car and sell information technology from the boot/trunk you lot can apply a table/blanket to lay your stuff out on, very pop in england, some of them are quite big. exercise yous not have them?
#25
Posted 24 Oct 2007 - 04:00 AM
I've done this a few times now and detect it very enjoyable to do, i purchase old bins that demand repairing very cheaply at boot sales ect and and so spend many an hour learning how they go together and along the way 9x out of 10 i end up with a great set of bins that cost me adjacent to null. i simply wont pay someone else to do something i bask doing myself fifty-fifty if they are better than me at information technology.... how else am i to acquire?
Great!
I got a quote for cleaning the nikons merely it was so much im going to do it myself,
Swell?
What kind of quote did you get? Was it besides loftier in comparison with the toll the seller of the binocular asked (very low), or with the price you lot paid (ridiculously low), or with the work you assumed was necessary to dismantle, clean, reassemble and (truly) collimate the musical instrument?
By some adverts it seems that in the U.K. the cost of a consummate overhaul can be £twoscore, if spare parts are not needed. Exercise you lot judge information technology too much?
Regards
Claudio
Source: https://www.cloudynights.com/topic/135304-nikon-j-b7-7x50s-%C2%A315/
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