Binoculars won't stay adjusted??? (2 Viewers)

[number41]

I have some older Minolta MK 7x50 binoculars. When I adjust them comfortably spaced to my eyes, they won't retain that position. Almost like a "hinge" needs to be tightened. Although looking at them I can't find any type of screw or adjustment.
Anyone know how I can adjust them?

thanks.

 

[Binastro]

Hi and welcome.

The hinge needs tightening, but I don't know how.

I have Minolta MK 7x35, 8x40 and 10x50.

Regards,
B.

 

[Scott98]

how about a picture? On many binos there's a little cover or plate on the bottom end of the hinge that must be pried off to access the adjustment screws underneath.

 

[number41]

I will try to post two pics.

https://imgur.com/YSUXm4f

https://imgur.com/xOwjTFA

I do see a circular cover but didn't want to force it off in case it might break something.

 

[Binastro]

Thanks for the photos.

The 10x50 MK also has a 7.8 degree field.
I used this daily for ten years with no problems.

Don't try to do anything until one of the binocular repairers answers.
It may be a simple job, maybe not.

I don't know if you want a professional service by say Suddarth Optical, for regreasing etc.

B.

 

[Scott98]

I see what you mean, I'd be afraid to start prying stuff off also. The servicing is usually $200 though, so it might be worth taking some risks

 

[Troubador]

If the dealer who sold them to you is within a reasonable travelling distance from you, give them a call and ask them if they could do this adjustment for you.

 

[dries1]

number41,

I would go to a website Cloudynights, sign up (it's free). There is a Binocular sub forum there and post the photos there with your issue. I am sure you will get someone there who has repaired these, they have extensive knowledge on the older porro prism binoculars. l have seen these same binoculars posted there in the past, so it cannot hurt to try.

 

[Foss]

Can't tell by the pix, but it looks like the axle caps may be glued down. If that's the case, prying the caps off may damage them.
And yes, ^^^ Cloudynights is a great resource.

 

[number41]

thanks for all the help. I did find some info and the "cap" that says Minolta does come off revealing an adjustment screw. So, I have the hinges a little tighter now.
Although it does look like more of a specialized tool should be used, I still managed to turn it about 1/8th of a turn.

 

[Scott98]

how'd you get it off? Just curious - screwdriver edge? razor blade??

 

[Binastro]

Rotation?

B.

 

[number41]

how'd you get it off? Just curious - screwdriver edge? razor blade??

I just screwed it off. Previously I wasn't sure if it came off so I didn't want to break it.
I only paid $1 for these at a yard sale so I wasn't too concerned about breaking them.

 

[Binastro]

If clean and collimated $50.

Regards,
B.