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Diego
super member
Reged: 07/29/03
Posts: 179
Loc: Argentina South America
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Yesterday, UPS dropped off my new 20x90 Oberwerk Binos.
First impression was, Man! these are huge...
Then...heavy!!
The optics are Fully Multi Coated. Only nice green reflections on the objectives, prisms and eyepieces. Build quality looks good too. I was a hair away from buying Celestron Skymaster 25x100, but they are NOT fully multi coated. I called Celestron to ask them about this and they said they are coated on air to glass surfaces but not inside, and they can't be collimated. Edz told me that you can really see the difference between FMC and MC optics, so the 20x90 it was.
I then took them outside, in daylight...  , what's wrong? Double images.
They were slighty out of collimation. I asked Kevin if I could collimate them myself instead of sending them back, and he told me to follow the procedure on his webpage.
I had never collimated a binocular before in my life, but with just a half turn on the left prism screw they are now perfect.
I havn't been able to test them at night and obviously it's raining now. There is some chromatic aberration in bright daylight, but nothing to worry about. I'll try to report my viewings as soon as the weather permits. I'm temporarily in Westminster, at a pretty light polluted neighborhood, so I won't be using them at their full potential.
Talk to you soon..
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Diego
Celestron 80 mm f11.4
Oberwerk 20x90
6" f7.8 Reflector
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Rusty
Postmaster
Reged: 08/06/03
Posts: 16399
Loc: Brooker, FL
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Diego, you're going to like those binocs - there's a little fringing on bright objects, but mostly barely noticeable. For the price, they're excellent.
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Anonymous
Unregistered
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And the exit pupil is a nice 4.5mm. For some reason I'm really bothered that the exit pupils in my binoculars don't come out to be a nice number like that 
Anyway, congradulation! I hope you enjoy your new binoculars.
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Erik D
Carpal Tunnel
Reged: 04/28/03
Posts: 2551
Loc: Central New Jersey, USA
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Diego,
Glad to hear from someone in th southern hemisphere. I've been to Buenos Aires once for business but never ventured outside the city. Hope to visit some dark sky locations with my binos the next time. The Oberwerk 20X90 is a relatively new model. I thought it would be a good idea if Kevin B offered a 22X100 model with rubber armor also. Look forward to reading your full report. About how long did it take to receive your binos in Argentina after you placed your order?
Daniel S:
Just noticed you footnote about selling the 22X100s soon. I don't know if you mentioned the reason for wanting to sell in a different thread. Too heavy for your mount? Optical qualtiy? I am curious because the Oberwerk 22X100 is my recommended choice among currently available 100mm binos in that price range.
Erik D
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12566
Loc: Cumberland, R I , USA42N71.4W
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If I recall Dan, wasn't it because you picked up a pair of 15x70s and found them to be a perfect fitand it seemed to you the 22x100 were just too big. There's that personnal preference thing coming into play. For some people, sometimes bigger is not better.
But, if you are mounting binocs, that eliminates a lot of that difference.
Diego, happy to hear you got the 90s. Hope that collimation issue is a minor one.
Eric, For a big binocular, I chose something other than 22x100s because they have the exact same eyepiece assembly as the 20x80 Deluxe. There was serious right diopter adjustment problems with that particular assembly. I could never get the right eye to complete focus, even with my glasses on. Kevin did inform me that there is potential adjustment that would help correct for that limited right diopter if needed for a particular individual.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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Anonymous
Unregistered
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Yes, that's the reason. I can't remember the date of the last time I used my 22x100's(several weeks)- to me the biggest I want is the biggest I can hold.
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Diego
super member
Reged: 07/29/03
Posts: 179
Loc: Argentina South America
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Hi guys,
After the collimation adjustment, the binos work perfectly  But the sad news is that here in Westminster CA, they are almost useless due to the light pollution. I tried to view M81/M82 with no luck at all. I even tried M51...nothing.
I still don't have a tripod to mount them and they are really heavy.
When viewing Saturn I can decern the Rings, and I'm sure that with a steady mount, you may be able to see Jupiter's two main cloudbelts.
When viewing the Moon, the sight was breathtaking. It has a little bit of chromatic aberration but not much. It seemed about the same size I usually get with the 80mm scope at 56x, Moon features were also much better resolved.
To answer Eric's question about the shipping, I am visiting the US for a few weeks. I had them ship the binos to my Cousin's house where I am staying. I ordered on Wednesday and they arrived on Tuesday of the next week.
Once I get to a dark site, I'll try to post a good report.
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Diego
Celestron 80 mm f11.4
Oberwerk 20x90
6" f7.8 Reflector
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KennyJ
Reged: 04/27/03
Posts: 10143
Loc: Lancashire UK
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It seemed about the same size I usually get with the 80mm scope at 56x.
Diego , presuming you ARE talking about how big the moon "seemed" through 20 x 90 binos , I must point out that the word "SEEMED" is very key.
It's amazing how psychology ,image quality and field of view , to name but three factors , can actually "fool" the brain into "believing" such things.
I can guarantee however that if you can mount the binos next to the 80mm scope at 56x and compare the two side by side , the image through the binos will indeed be less than HALF the apparant size.
Also , just wondering , is there no way you could affix the binos to whatever tripod / mount you are currently using with your scope ? -- there are usually threads on top the rings ( intended for piggy-backing ? )that you could easily attach a simple L-bracket to.
Although this would not provide the perfect or most comfortable viewing position , nor be very stable , it probably COULD serve a purpose until you get home and get whatever tripod / mount set -up you have in mind.
Regards --and enjoy your binos !
Kenny.
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Two eyes and a preference to use both
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Swift Audubon Kestrel 10 x 50
Helios 15 x 70 Observation
Strathspey 20 x 90
Televue 76 APO
Zeiss 85 Diascope
Helios 102 f5 refractor
Various eyepieces barlows tripods mounts etc.
Panasonic Lumix DMC - TZ5 digital camera
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Anonymous
Unregistered
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I've also noticed that images appear much bigger in binoculars than they do in a telescope even at equal magnifications. Oh well, all a telescope is, is an optical illusion right? So if there's a better way to perform this illusion so much the better. The only downside is that because they *really* are the same size the image in the telescope will look much sharper; apparently although the mind sees fit to bump of the apparent size- the eyes cant pick up enough detail to match it. Even so it's a large advantage to have a *closer view* even if you don't gain any detail.
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