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Audubon 8.5 x 44 HR/5 repair by Nicolas Crista

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Old Friday 12th December 2014, 15:03   #1
Chhayanat
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Audubon 8.5 x 44 HR/5 repair by Nicolas Crista

I first contacted Nicolas Crista about the Audubon 8.5 x 44 HR/5s discussed in this thread. Moving from place to place meant that it finally took till November 2014 for the glasses to be returned to me after repairs and adjustment.

He replaced the dented prism covers with unmarked ones. The replacement covers are marked "Fully Multicoated" though the glasses themselves with a 1985 manufacturing date are just "Multicoated". It does not matter as I do not intend selling them. The other putative user of the glasses knows a lot about birds but nothing about multicoating

Mr. Crista cemented the prisms besides lubricating the glasses and collimating them.

When using them, I thought the view quite relaxing. I would have demanded a little more brightness. My vision has deteriorated suddenly from illness; otherwise, i feel I would have found them slightly sharper than I do now.
With my glasses on, even at the maximum interpupillary distance, the prisms appear to interfere with the field of view. This was true before the repair as well.

Tomorrow I am going birding and will have an opportunity to make a comparison with the following binoculars, CZJ Jenoptem 10 x 50w, CZJ Notarem 10x40B, Pentax 8x42WP Nikon Premier 10x42 HG_L. Others with better vision than mine would be able to offer comments as well.

Nicolas Crista has done a fine job with these Audubons both mechanically and cosmetically.
Best wishes,
Chhayanat
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Old Saturday 13th December 2014, 05:26   #2
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Hi Chhayanat. Glad to hear that your HR/5 repair worked out. Bill had recently posted that Nicolas Crista had retired, but I guess he is still handling some work.
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Old Sunday 14th December 2014, 03:26   #3
Chhayanat
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Quote:
Originally Posted by peatmoss View Post
Hi Chhayanat. Glad to hear that your HR/5 repair worked out. Bill had recently posted that Nicolas Crista had retired, but I guess he is still handling some work.
I first contacted Nicolas Crista about the binoculars in June 2013 but I was diverted by my movement from one country to another.My friend who took the binoculars to the US for repair, also said that Nicolas Crista was very difficult to contact. One assumes, therefore, that he has, in effect, he has retired.
Comparison of the Audubon with other binoculars was abandoned as there was unseasonal rainfall which made non-waterproof binoculars risky.

Last edited by Chhayanat : Sunday 14th December 2014 at 03:31. Reason: Omission of germane fact
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Old Friday 19th December 2014, 00:50   #4
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Quote:
Originally Posted by Chhayanat View Post
I first contacted Nicolas Crista about the Audubon 8.5 x 44 HR/5s discussed in this thread. Moving from place to place meant that it finally took till November 2014 for the glasses to be returned to me after repairs and adjustment.

He replaced the dented prism covers with unmarked ones. The replacement covers are marked "Fully Multicoated" though the glasses themselves with a 1985 manufacturing date are just "Multicoated". It does not matter as I do not intend selling them. The other putative user of the glasses knows a lot about birds but nothing about multicoating

Mr. Crista cemented the prisms besides lubricating the glasses and collimating them.

When using them, I thought the view quite relaxing. I would have demanded a little more brightness. My vision has deteriorated suddenly from illness; otherwise, i feel I would have found them slightly sharper than I do now.
With my glasses on, even at the maximum interpupillary distance, the prisms appear to interfere with the field of view. This was true before the repair as well.

Tomorrow I am going birding and will have an opportunity to make a comparison with the following binoculars, CZJ Jenoptem 10 x 50w, CZJ Notarem 10x40B, Pentax 8x42WP Nikon Premier 10x42 HG_L. Others with better vision than mine would be able to offer comments as well.

Nicolas Crista has done a fine job with these Audubons both mechanically and cosmetically.
Best wishes,
Chhayanat
I don't think you will find that Nick "cemented" the prisms. They sit clipped to a prism shelf with leaf springs. They were my birding bino until I got my SE. I could go back to them without shedding a tear.

Bill
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Last edited by WJC : Friday 19th December 2014 at 00:53.
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Old Friday 19th December 2014, 04:41   #5
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Quote:
Originally Posted by Chhayanat View Post
I first contacted Nicolas Crista about the binoculars in June 2013 but I was diverted by my movement from one country to another.My friend who took the binoculars to the US for repair, also said that Nicolas Crista was very difficult to contact. One assumes, therefore, that he has, in effect, he has retired.
Comparison of the Audubon with other binoculars was abandoned as there was unseasonal rainfall which made non-waterproof binoculars risky.
Hi Chhayanat,

I've dealt with Nick for over ten years concerning Swift binoculars, e.g., history, repairs, parts, etc. I've never had the slightest difficulty getting hold of him at this [NRC Optics business number].

What is your IPD, incidentally?

Ed
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Old Sunday 21st December 2014, 13:39   #6
Chhayanat
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Originally Posted by elkcub View Post
Hi Chhayanat,

I've dealt with Nick for over ten years concerning Swift binoculars, e.g., history, repairs, parts, etc. I've never had the slightest difficulty getting hold of him at this [NRC Optics business number].

What is your IPD, incidentally?

Ed
My friend who took the glasses to the US for repair said he often got recorded messages from that number. Once he was able to connect with Mr. Crista, however, things proceeded smoothly.
I do not know my interpupillary distance. Is it measured from the centre of one pupil to the centre of the other? I am sure that it will figure somewhere in BF.
I don't know whether this rather iffy explanation helps but when I move the oculars up and down the central axis, the only place where I get a approximately whole and peaceful image is when the IPD is at its widest, i.e. with the marker just above the 70 degree mark and the glasses effectively locked at that position after which they cannot be widened further.
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Old Sunday 21st December 2014, 13:45   #7
Chhayanat
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Quote:
Originally Posted by WJC View Post
I don't think you will find that Nick "cemented" the prisms. They sit clipped to a prism shelf with leaf springs. They were my birding bino until I got my SE. I could go back to them without shedding a tear.

Bill
Maybe he did not actually cement the prisms. I took the term from the work estimate which he sent my friend who was handling the binoculars in the US which I am quoting from below:
# 804 8.5x42 Hit/dropped
Remove prisms
clean all optics
cement prisms to specs.

I have also developed a medical problem with my eyesight which, together with ageing eyes, prevents them achieving the entral sharpness associated with these binoculars. This was the main reason for buying these glasses.
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Old Sunday 21st December 2014, 21:02   #8
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Quote:
Originally Posted by Chhayanat View Post
My friend who took the glasses to the US for repair said he often got recorded messages from that number. Once he was able to connect with Mr. Crista, however, things proceeded smoothly.
I do not know my interpupillary distance. Is it measured from the centre of one pupil to the centre of the other? I am sure that it will figure somewhere in BF.
I don't know whether this rather iffy explanation helps but when I move the oculars up and down the central axis, the only place where I get a approximately whole and peaceful image is when the IPD is at its widest, i.e. with the marker just above the 70 degree mark and the glasses effectively locked at that position after which they cannot be widened further.
Yes, your IPD is the distance between the centers of your eye pupils. From the sound of it, yours is ≥ 70mm, which is at the high end of the population distribution. But, if it makes you feel better it has been said that intelligence is positively correlated with IPD (an old wives tale?). Your optometrist can tell you your IPD since it's needed to fit your glasses properly.

Ed
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Old Monday 22nd December 2014, 12:02   #9
Chhayanat
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Quote:
Originally Posted by elkcub View Post
Yes, your IPD is the distance between the centers of your eye pupils. From the sound of it, yours is ≥ 70mm, which is at the high end of the population distribution. But, if it makes you feel better it has been said that intelligence is positively correlated with IPD (an old wives tale?). Your optometrist can tell you your IPD since it's needed to fit your glasses properly.

Ed
Thank you. I did not realise that the markings on the plate of the central axle of older porro binoculars were in mm.
If the maximum IPD of the 804R is around 70mm, then the IPD of the other glasses I use must be a little more as I have no difficulty in seeing whatever FOV is available (to me with spectacles) in an uninterrupted fashion. My other glasses are:
CZJ Jenoptem 10 x 50w (eye relief 10mm), CZJ Notarem 10x40B, Pentax 8x42WP and Nikon Premier 10x42 HG_L

After I read your post, I recalled reading something similar about the 804R IPD years ago. I found the post after some searching on the net. It is by Dana A. Bunner in an online review of 8X binoculars on 5 June 1995.
"Swift Audubon 8.5x44: Wide FOV of 430'. Moderately heavy at 29 ounces.
Very good center field sharpness falling off toward lense edge, but still
usable. Very good contrast. Insufficient eye relief for eyeglass
wearers, I noticed a definite loss of field with glasses. Close focus
was decent at 13'-14'. Very bright images, even in low-light situations.
Unable to focus at infinity w/o eyeglasses. Interpupillary distance was
a bit narrow, just over 70mm, at maximum separation
."
The link is
http://www-personal.umich.edu/~bbowm...h/bin_8x_a.txt

As to the correlation between wide IPD and high IQ, my teachers would have disagreed.

Last edited by Chhayanat : Monday 22nd December 2014 at 12:05.
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Old Thursday 25th December 2014, 18:38   #10
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Quote:
Originally Posted by Chhayanat View Post
Maybe he did not actually cement the prisms. I took the term from the work estimate which he sent my friend who was handling the binoculars in the US which I am quoting from below:
# 804 8.5x42 Hit/dropped
Remove prisms
clean all optics
cement prisms to specs.

I have also developed a medical problem with my eyesight which, together with ageing eyes, prevents them achieving the entral sharpness associated with these binoculars. This was the main reason for buying these glasses.
His "cement prisms to specs" PROBABLY meant cementing the prism to the prism shelf in the needed orientation to remove "lean." In the attached photo, you can see where two tabs of glue are used in seating the upper prism. The first photo to the right (Thanks Jan) shows the U.B.M.M. display for a bino that needs a collimation adjustment but which has very little lean. The photo on the far right is of a binocular the has a major collimation issue and considerably more lean in both telescopes. This should be corrected before a good collimation process can be started.

Why haven't you heard of "lean" before? Just as some people don't know binoculars needs to be collimated, even fewer have ever heard of "lean" or know about attendant problems. This is what often prompts me to say, "Some people don't know what they don't know."

Cheers,

Bill
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Last edited by WJC : Thursday 25th December 2014 at 19:03.
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Old Friday 26th December 2014, 11:30   #11
Chhayanat
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Quote:
Originally Posted by WJC View Post
His "cement prisms to specs" PROBABLY meant cementing the prism to the prism shelf in the needed orientation to remove "lean." In the attached photo, you can see where two tabs of glue are used in seating the upper prism. The first photo to the right (Thanks Jan) shows the U.B.M.M. display for a bino that needs a collimation adjustment but which has very little lean. The photo on the far right is of a binocular the has a major collimation issue and considerably more lean in both telescopes. This should be corrected before a good collimation process can be started.

Why haven't you heard of "lean" before? Just as some people don't know binoculars needs to be collimated, even fewer have ever heard of "lean" or know about attendant problems. This is what often prompts me to say, "Some people don't know what they don't know."

Cheers,

Bill
Thanks I can see the difference in the two pictures and your explanation makes it easier to understand why that difference is there. What is blue-coloured glue used for cementing and is it sold in large hardware stores?
Best wishes,
Chhayanat
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Old Saturday 27th December 2014, 18:47   #12
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Originally Posted by Chhayanat View Post
Thanks I can see the difference in the two pictures and your explanation makes it easier to understand why that difference is there. What is blue-coloured glue used for cementing and is it sold in large hardware stores?
Best wishes,
Chhayanat
The blue is some variety of "lock tite."

Bill
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Old Sunday 4th January 2015, 09:16   #13
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The blue is some variety of "lock tite."

Bill
Thanks. I have noticed a similar blue-tinted glue covering screws inside assorted electronic items as well and was curious to know what it was.
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Old Monday 5th January 2015, 03:09   #14
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Thanks. I have noticed a similar blue-tinted glue covering screws inside assorted electronic items as well and was curious to know what it was.
In many of the binos I have repaired and collimated, it was definitely Lock Tite. However, in all other things I'm at a loss.

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Old Monday 12th January 2015, 22:56   #15
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Here is text with a description
of the WW2 cement used while upgrading the
US Army M3 to the M13:

http://home.europa.com/~telscope/milusarm.txt

---cupric oxide powder / phosphoric acid / zinc chloride / water (dried)

...and various other funky procedures.

I put the prisms back in line on some USN WW2 Wollensack 6x30s
that had (cracked) cement. Not sure what the binder was,
but it was mostly silica-powder-filled. Replacement with some
epoxy putty seemed appropriate. I didn't want normal epoxy to
crawl under the prism or to bond too strong, just keep position.
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