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 Post subject: Cleaning TENTO 20X60's
PostPosted: Thu Sep 21, 2017 4:25 pm 
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Joined: Mon Jan 09, 2006 11:05 am
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Location: Lancashire
Can anyone recommend a good binocular repair service to remove the fungus from a prism in the TENTO's?
Removing fungus is easy to do, but recollimating is something else.

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PostPosted: Sat Sep 23, 2017 7:00 pm 
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Hi Brian,

East Coast Binocular Repairs.

Regards,
David


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PostPosted: Mon Sep 25, 2017 9:36 am 
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Thanks David. It would probably cost more to have the job done than what I paid for TENTO's, but I do like them.
Regarding recollimation. Is it possible to do it on the kitchen table, so to speak, without recourse to an optical bench?

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PostPosted: Mon Sep 25, 2017 2:17 pm 
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I couldn't Brian.
It is called conditional alignment for your IPD but not for other IPDS.

You probably have the skills necessary but I would send such binoculars to an expert such as Gary.

My selected specially made 20x60 Soviet binocular has been waiting for years uncollimated, but I doubt I will get it done.

Regards,
David


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PostPosted: Sat Nov 04, 2017 3:06 pm 
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I've sent off the TENTOs David to the firm you recommended and they've acknowledged receipt of them. "We are very busy" they said, but the wait should be worth it.
Why don't you have your own Russian binoculars recollimated? It seems a shame to have a good pair of binoculars languishing in a corner when they can be used. You could always sell them, knowing that you've brought them back to life. :D

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PostPosted: Sat Nov 04, 2017 3:53 pm 
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Hi Brian,
They are also the Zeiss official repairer, so they can get busy.

There are many things pending. More important for me is to look after myself rather than things.

Also I do less observing than I used to and have the 18x50 when I need something bigger. Mainly for Jupiter's moons.
And night and day don't vary that much any more as the light pollution steadily engulfs the local sky.

Regards,
David


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PostPosted: Mon Nov 06, 2017 2:58 pm 
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I have the "ordinary" TENTOs David, but they also made a tropical glass of the same 20X60mm spec.
What did they mean by "tropical"? Nitrogen purged to keep out moisture in warm, humid climates?

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PostPosted: Mon Nov 06, 2017 3:42 pm 
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Hi Brian,
I don't know the Tropical 20x60 Tento.

Mine is one of the specials arranged I think by J. Hysom. I think they are made with possibly 1/20th wave optics at least in part and specially assembled.
I think G. Alcock had one of them, as did I.
There may only be a dozen made for the U.K. although Soviet presidents would get the same quality optics.

Many of the 20x60s are not that good, and some later Russian ones are just poor, made with parts after the Soviet collapse, some without serial numbers.

Regards,
David


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PostPosted: Tue Nov 07, 2017 4:46 pm 
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Fortunately, the 20X60 glass I have is good. I once looked through TENTO 10X50 bins at a flea-market and they were awful. Apart from bad optics, they were in mint condition.
The stallholder, who used to be a rep for Russian "Zenit" cameras, asked me to price them, but I couldn't wish them on anybody!
You mentioned Jim Hysom ( AE Optics ). Back in the '80s, he polished a Wildey 4-inch/f.12 Fraunhofer objective for me. There was a fine scouring on the glass that produced a milky cast, especially on the Moon. I still have the air-spaced objective sealed in a tin. It's very good and should really be used!

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PostPosted: Sun Dec 03, 2017 10:33 am 
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Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
I have seen some really horrible old binoculars in local "junk and recyclingk" shops, and often at ridiculous prices. I dropped into Emmaus (the local recycling centre) yesterday for a wander-round. They had three binos for sale. The 50mm binuculars were priced at £10 but unfortunately that were very dirty within and no use at all. The medium-sized, priced at much more, were no better and even had a dint in the OG. The final one was a "Field Issue" "made in France" operaglass. This cleaned up quite well, using a tissue, (although the case was moldy). I might have paid the £10 for this but it was greatly overpriced. The operaglass was the only instrument of any use what-so-ever. regards maf


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PostPosted: Mon Dec 04, 2017 10:57 am 
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It's the luck of the draw when it comes to secondhand binoculars. I have a range of secondhand
Japanese bins, all in nice condition and bought for a song: 10X25, 8X40, 9X40, 7X50, 10X50 ( four pairs! ), 16X50 and 20X50.
The ones bought new are the 15X70 and 25X70 CELESTRON Skymasters, although these are stopped down to 63mm clear aperture at the prisms.
Should we older folk get rid of binoculars with an exit pupil greater than 3mm to 4mm? This would mean shedding more than half of mine.
The iris shrinks with age. According to a table of pupil sizes in the book "Stargazing with Binoculars", co-authored by Robin Scagell and David Frydman, my age group has a much reduced pupil size compared to owl-eyed youngsters with 6mm to 8mm pupils.

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PostPosted: Fri Dec 22, 2017 1:52 am 
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Brian, just an afterthought here. If you stick each foot in the bath alternately, you can wash five toes at a time. I find it easier than cleaning Tentos. :D Bob


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PostPosted: Fri Dec 22, 2017 1:22 pm 
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I sent the TENTO's off for cleaning in October, but haven't heard from the cleaners since. They must be taking a long bath. :wink:

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