Question about Celestron Nautica 71189 (7x50) Binocular

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I have a Celestron 7by50 waterproof binoculars that I droped.Now when I look trough them I see 2 pics. at differant hights also they sound like the prism is loose.I have had this on cheeper binoculars and took t hem apart and fixed them myself but I am not sure If I wont to do this.. thanks Dave Evans

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Your binoculars either have a bent or broken yoke assembly (the bit which carries the eyepieces) or one or more prisms have came unseated. Your description firmly suggests the latter.

The first repair involves replacing the entire yoke assembly: the part is expensive in comparison to the retail cost of a new pair of binoculars and with labour charges on top is not usually a cost-effective repair except on really high end models at prices far higher than yours (which can be replaced for around GBP£200).

The second repair is straightforward and fairly quick for anyone with the right collimation equipment, but the screw(s) need to be secured with thread-locking liquid afterwards.

Your binoculars have far higher repair costs than usual as they are waterproofed so need to be serviced by the correct specialists who know how to replace the seals and who are able to recharge the nitrogen filling if disassembly becomes necessary. As the prism seems to be loose it's unlikely to be a mere matter of adjustment.

Either way, you really need to get a Celestron servicing agent to diagnose the fault and provide you with an estimate, or you can go ahead and see what's wrong yourself (they're broken anyway!) and see whether you can repair things sufficiently that they just need re-collimation and gas filling, a far cheaper repair. If the seals look good, then wipe them with a thin smear of silicone grease upon re-assembly (sold as o-ring lube at any plumbing shop)

I hope you manage to use this information to fix your binoculars or at least that it assists you to choose your next course of action. Please take a moment to rate the free answer I have provided for you and any testimonial which you might wish to add is always welcome!

Posted on Oct 02, 2010

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