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OVL = TS

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#1 daslolo

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Posted 10 April 2020 - 01:05 AM

They are $25 apart yet their 82 degree eyepieces look the same. Are they the same?



#2 sg6

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Posted 10 April 2020 - 02:50 AM

Eyepieces are fairly often copies/clones of each other.

So yest I would say they are, and I haven't even looked.

Consider the Paradigms, they are also BST Starguiders, Agena ED2, and one other brand name I forget (Olivon ??). So there are 4 all the same. Think they are sold in Aus under the Saxon name also.

 

My WO SWANS are under assorted names.

 

So when it comes to eyepieces almost certainly: Yes they are identical.

One question may be any QA performed on the final assembled performance. And then are they graded as say A, B, C

Who gets (pays for) A's, B's and C's.


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#3 25585

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Posted 10 April 2020 - 05:10 AM

TS use various makes under their own label, GSO definitely. OVL is an importer so they could well share some optics.


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#4 Starman1

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Posted 10 April 2020 - 01:07 PM

They are $25 apart yet their 82 degree eyepieces look the same. Are they the same?

Those eyepieces were first sold as William Optics UWAN eyepieces, starting many years ago.

Since then, the have been sold as:

OVL Nirvana

SkyWatcher Nirvana

Telescope Service UWAN

and several others, like Levenhuk, or Omegon.

They have been gradually phased out by most companies, and are slowly disappearing from the market.

I don't know why, but most sellers have stopped selling the 28mm, so they are mostly available now in 4mm, 7mm, and 16mm.


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#5 daslolo

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Posted 10 April 2020 - 01:37 PM

They have been gradually phased out by most companies, and are slowly disappearing from the market.
I don't know why, but most sellers have stopped selling the 28mm

Who makes them?
Is there a difference in stock quality between the brands?
How do they compared in term of clarity and kidney beans to an es82 of the same barrel size and FL?
I'm interested in them in a bino

#6 Starman1

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Posted 10 April 2020 - 01:55 PM

1.Who makes them?
2.Is there a difference in stock quality between the brands?
3.How do they compared in term of clarity and kidney beans to an es82 of the same barrel size and FL?
I'm interested in them in a bino

1) not sure.  Could be Long Perng in Taiwan or KUO in China.

2) Unlikely, since the cost of manufacturing different small batches would be prohibitive.

3) They have gotten good reviews here on CN, but due to their lower popularity compared to ES, there aren't as many comments.

However, blackouts are not real common in eyepieces with shorter eye reliefs, so I wouldn't expect them to be bad in that regard.

Like the ES, they are not glasses-compatible.



#7 daslolo

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Posted 10 April 2020 - 02:44 PM

Perfect! Thank you so much I think they'll give stellar (laugh.gif ) views with binos.

Which of these brands is the cheapest?

2) in electronic they pull a number of units for testing and based on failure rate or other stats they mark the batch as A,B,C, like etalons going to Quark or Quantum. They don't do that in these low price eyepieces?


Edited by daslolo, 10 April 2020 - 02:44 PM.


#8 Starman1

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Posted 10 April 2020 - 05:29 PM

Perfect! Thank you so much I think they'll give stellar (laugh.gif ) views with binos.

Which of these brands is the cheapest?

2) in electronic they pull a number of units for testing and based on failure rate or other stats they mark the batch as A,B,C, like etalons going to Quark or Quantum. They don't do that in these low price eyepieces?

Absolutely not.  There is not enough profit in the eyepieces to even inspect them after assembly.

In my experience, they don't even bother to clean them a lot of the time.

I've cleaned brand new eyepieces where the q-tips moistened with cleaning solution came off the lenses with dirt and debris on them.

That's why QC is often so poor on inexpensive eyepieces.


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#9 daslolo

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Posted 10 April 2020 - 06:34 PM

I noticed, often had to open and close them to remove rattle.

I found a difference: The TS are Nitrogen filled and have the N letter after FMC



#10 daslolo

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Posted 15 April 2020 - 01:56 PM

My WO SWANS are under assorted names.


Which ones?

#11 Starman1

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Posted 15 April 2020 - 04:13 PM

Which ones?

Hard to tell exactly, but maybe:

Opticstar XS Super wide angle

Bresser 70

Discovery Series 70

Agena Super wide Angle

I think there were more in the past and some eBay brands might still be selling them.



#12 Antodumont

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Posted 16 April 2020 - 03:59 AM

  Hello ,

 

I've have both ES 14/82° and WO 16/82° , I don't have a lot of experience but I do prefer the WO for the darker sky background it provides



#13 daslolo

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Posted 17 April 2020 - 12:34 AM

Darker sky= less light passing through the eyepiece isn't it.
Given that the 16mm is 30% larger than the 13, it's not a good sign on the lens quality.
Then if you want to look at DSO the WO isn't helping.
It's better to use light pollution filters if that's what keeps your sky bright.

#14 Antodumont

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Posted 17 April 2020 - 12:48 AM

Darker sky= less light passing through the eyepiece isn't it.
 

I would say more contrast ....

 

I have a pretty nice sky , the best nights , I'm able to see the veil in the WO 16 without filter but not in the ES 14 .....


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#15 daslolo

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Posted 17 April 2020 - 01:23 AM

Interesting, I didn't know optic could apply a gamma curve to light, that's good to know.

The veil is faint, good eyepiece indeed.




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