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Thread: Sears 10x50 Discoverer Binos

  1. #1
    Don Alvarez's Avatar
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    Default Sears 10x50 Discoverer Binos



    So (there it is again) my dad came up with another auction special, a pair of old Sears 10x50 Discoverer binos for $7. Age unknown, but they're the ones with the silver highlights around the focus wheel and eyepieces. Glass is in good shape but dirty, though the exterior is pretty messed up and some nimrod etched his name and some other nonsense on the housings. Now, my dad was hoping to use these for spotting down at the shooting range, but they are out of collimation a bit. I see no screws on the housing, but I've read these may employ collimation "rings" around the objective lenses. I took off the cover and sure enough, there is an inner and outer ring around the objective one or the other I assume is the collimation ring, and that's about as far as my Google expertise takes me. Am I on the right track here? Can anyone give me some tips on lining these things up?
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    Default Re: Sears 10x50 Discoverer Binos

    Hello Don,

    any pics of the binoculars to share?
    These may be Tasco or others from Japan, just rebranded, so not bad.
    Best,

    JG
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  3. #3
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    Default Re: Sears 10x50 Discoverer Binos

    Quote Originally Posted by j.gardavsky View Post
    Hello Don,

    any pics of the binoculars to share?
    These may be Tasco or others from Japan, just rebranded, so not bad.
    Best,

    JG
    I'll post some up when I get home from work JG
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  4. #4
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    Default Re: Sears 10x50 Discoverer Binos

    Here we go. As I said, dirty. On closer inspection it looks like these may have taken a few shots, the retaining ring might be flattened on one of the objectives and it may be pushed from center slightly. I'm wondering if that might be the cause of the collimation issue. I've highlighted a closeup of the rings on one of the objectives, I don't know if one of these is the collimation ring I've heard described or part of the cell maybe. Any ideas, or are these hopeless?

    20180516_230159.jpg 20180516_230213.jpg 20180516_231408.jpg
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    Default Re: Sears 10x50 Discoverer Binos

    Thanks for the pics, Don!

    They still have the sticker "passed", which indicates a high quality made in Japan for export.
    Admitted, I have no idea where the collimating screws are hidden, they are as a rule covered by the armor.
    You'll spend some time with cleaning I guess, but this pair for $7 is pretty good.

    Keep us posted about your progress,

    JG
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  7. #6
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    Default Re: Sears 10x50 Discoverer Binos

    Quote Originally Posted by j.gardavsky View Post
    Thanks for the pics, Don!

    They still have the sticker "passed", which indicates a high quality made in Japan for export.
    Admitted, I have no idea where the collimating screws are hidden, they are as a rule covered by the armor.
    Oh I hope not. I already probed with a knife where I thought one may be, only to find nothing but the housing underneath. That armor is more like just a skin.
    You'll spend some time with cleaning I guess, but this pair for $7 is pretty good.

    Keep us posted about your progress,

    JG
    Thanks to Bryan it'll be clouded up and raining the next two days, so these and the Sans & Streiffe probably get some love this weekend. I may have to invest in a good pair of spanners.
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    Default Re: Sears 10x50 Discoverer Binos

    My internet source was indeed correct, these bino's don't have collimation screws, they use the rings as shown in my picture above. It's hard to tell in that picture, but after removing the retaining ring and pulling out the cells, it is apparent the collimation rings are off-center, so that when you are rotating the collimation ring you are actually changing the position of the objective. This actually corroborates some binocular collimation video's I've seen where people claim you can correct the collimation by rotating the objectives - they probably have bino's with collimation rings and don't realize it.

    I was able to pull these apart and clean them up pretty good, they actually come apart for servicing fairly easy with the exception of a stubborn retaining ring as I suspected. The eyepieces look good, unfortunately there was some damage to the amber coatings on the objectives. Unfortunate, but not surprising considering the shape they were found in. I replaced the objectives after cleaning, just snugged the retaining rings and tinkered with the collimation rings till they produced a good image. I will say, its probably not a true collimation but they are much easier to deal with than collimation screws. You give one side an 1/8th turn and then check the image. If the image is not coming together, try the other side. Simple. Once the image was lined up, I had to hold the collimation ring in place with a small screwdriver while I tightened the retaining rings. A brief daytime test produced a satisfactory image, and they should now be good for what he needs them for. For me, they're a big heavy and over-large, but I shouldn't complain much as that heavy durable frame has allowed them to still be in a usable condition after so many years.
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    Default Re: Sears 10x50 Discoverer Binos

    Nice save Don! Coincidentally, Orion 10x50 I got off eBay were also signed with marker. What's up with that?
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    Default Re: Sears 10x50 Discoverer Binos

    Quote Originally Posted by Bigzmey View Post
    Nice save Don! Coincidentally, Orion 10x50 I got off eBay were also signed with marker. What's up with that?
    I guess they hoped they'd be famous one day.
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