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31T5 orange color?

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#1 Im2bent

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Posted 19 October 2019 - 08:44 PM

So I was looking at the moon the other day and noticed an orange cast around the periphery of the view. looking at the bottom of the eyepiece there is a band of orangy looking cork? It looks like it is acting as a cushion for the lens? Could this be the source of the orange cast ? For those of you with this eyepiece does your have this cork like material and do you see this cast on bright objects?



#2 Spikey131

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Posted 19 October 2019 - 09:04 PM

No.  Nothing like that in my 31T5.

 

Sounds like there is something in yours that does not belong there.


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#3 rkelley8493

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Posted 19 October 2019 - 09:32 PM

I wonder if it was the "ring of fire" effect, also known as chromatic aberration of the exit pupil. Could you take a picture of the material you are speaking about, please?

 

Edit: Here is a photo of the ring of fire effect. Is that how it looked?

 

IMG_20181223_200635 (1).jpg


Edited by rkelley8493, 19 October 2019 - 09:41 PM.

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#4 havasman

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Posted 19 October 2019 - 11:15 PM

So I was looking at the moon the other day and noticed an orange cast around the periphery of the view. looking at the bottom of the eyepiece there is a band of orangy looking cork? It looks like it is acting as a cushion for the lens? Could this be the source of the orange cast ? For those of you with this eyepiece does your have this cork like material and do you see this cast on bright objects?

No.



#5 Im2bent

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Posted 20 October 2019 - 12:41 AM

I wonder if it was the "ring of fire" effect, also known as chromatic aberration of the exit pupil. Could you take a picture of the material you are speaking about, please?

 

Edit: Here is a photo of the ring of fire effect. Is that how it looked?

 

attachicon.gif IMG_20181223_200635 (1).jpg

Yes except all the way around. Did a search for ring of fire got a million eofb threads because the search term "of" . Will take a pic of the orange cork stuff in the morning.  Is there a known cure for the ring of fire? Break out a sharpie and go to town on the cork stuff?


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#6 Im2bent

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Posted 20 October 2019 - 09:45 AM

Here it is

Attached Thumbnails

  • Screenshot_20191020-074427_Gallery.jpg


#7 Spartinix

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Posted 20 October 2019 - 09:58 AM

Where did you get THAT TVN31?!?
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#8 rkelley8493

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Posted 20 October 2019 - 12:22 PM

Yea.. that looks defective undecided.gif

See if you can get to the inside of the eyepiece by decoupling [unscrewing] it near the green lettering. The eyepiece has two main sections, the eye lens assembly and the field lens assembly [it's probably got another name, but I'm just calling it how I see it]. Anyways, see if whatever that orange ring is can be removed or if it is embedded in the field lens.



#9 rkelley8493

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Posted 20 October 2019 - 12:28 PM

31t5.jpg

31t5br.jpg



#10 Spikey131

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Posted 20 October 2019 - 01:22 PM

I don’t know why you have that orange band inside the bottom of your EP.

 

But I don’t think that you are seeing it when you look through the eye lens.



#11 25585

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Posted 20 October 2019 - 01:27 PM

I wonder if it was the "ring of fire" effect, also known as chromatic aberration of the exit pupil. Could you take a picture of the material you are speaking about, please?

 

Edit: Here is a photo of the ring of fire effect. Is that how it looked?

 

attachicon.gif IMG_20181223_200635 (1).jpg

Poor Moon. She looks like she's been where no Moon should go!  


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#12 rkelley8493

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Posted 20 October 2019 - 01:50 PM

Poor Moon. She looks like she's been where no Moon should go!  

lol.gif I know, I know.. it's a very crappy picture. But it was the only example I had of :

 

p29345_v_v8_aj.jpg

 

roflmao.gif rofl2.gif


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#13 Im2bent

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Posted 20 October 2019 - 02:57 PM

Yeah yours definitely isn't like mine. Maybe mine is an older vintage? Or the po messed with it?

#14 junomike

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Posted 20 October 2019 - 04:20 PM

Is this 31T5 new? (maybe a new version with a dampening ring/cork).

My guess is you're not seeing the cork per se, but the reflection of it off the chrome barrel when viewing

the uber bright moon.

Interesting, maybe Televue can elaborate on this or Don can check his new stock to see if this is a new to the 31T5



#15 Im2bent

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Posted 20 October 2019 - 05:53 PM

Where did you get THAT TVN31?!?

 

 

Is this 31T5 new? (maybe a new version with a dampening ring/cork).

My guess is you're not seeing the cork per se, but the reflection of it off the chrome barrel when viewing

the uber bright moon.

Interesting, maybe Televue can elaborate on this or Don can check his new stock to see if this is a new to the 31T5

Bought it from a fellow LAAS member who got it from another LAAS member. Any way to tell vintage on these eyepieces?



#16 Im2bent

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Posted 20 October 2019 - 06:03 PM

Will give Televue a call tomorrow as there is no email for them on their website?



#17 Spikey131

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Posted 20 October 2019 - 08:28 PM

Call them.  Al might answer the phone.



#18 Im2bent

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Posted 21 October 2019 - 01:47 PM

Call them.  Al might answer the phone.

As a matter of fact he did and is following this thread. I had a very pleasant conversation with him and he spent a half an hour on the phone with me about this issue. He even had me hold for a couple of minutes while he put a 31t5 in a c8 he had there and viewed the daytime sky. He verified that he saw the "ring of fire" and that it is due to the eyepiece design and is only visible when viewing daytime or as in my case a near full moon. He said it is lateral color of spherical aberration of the exit pupil. If I could not live with it he recommended a 41 pan for the same field of view. He also recommended an Ethos 13mm as the perfect compliment for this eyepiece in my NS11GPS. As I am not using this for daytime terrestrial viewing I don't have a problem with it and when looking at the moon the issue can be ignored as far as I am concerned. He was a true gentleman to speak with, and took the time to answer my questions.


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#19 Spikey131

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Posted 21 October 2019 - 01:52 PM

Unparalleled customer service.

 

Did you ask him about the orange line inside the bottom of the EP?



#20 Im2bent

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Posted 21 October 2019 - 02:07 PM

Unparalleled customer service.

 

Did you ask him about the orange line inside the bottom of the EP?

Yes he said he had no idea what it could be. i wonder if its something the PO had done. When I get home I will take it apart per instructions Al gave me and inspect a little closer as to what this orange ring is.



#21 Spartinix

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Posted 21 October 2019 - 02:19 PM

I hope you can get it fixed!

#22 SeattleScott

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Posted 21 October 2019 - 03:53 PM

It sounds like it isn’t necessarily broken. Like others, I doubt it is affecting the view at all. The ring of fire is a well known issue with this particular eyepiece which makes it a poor choice for lunar observing, although if a 31T5 is your lunar specialist, either you have at least a 14” SCT or consistently poor seeing. Ultimately this was designed to be a low power DSO finder eyepiece, so a ring of fire seems like an acceptable compromise for an eyepiece that is so good in other ways. Unless there is some other issue with the views, I don’t know that I would bother taking it apart, although curiosity could get the best of me. But I also remember hearing about people taking eyepieces apart and having trouble getting them back together again. You know the old saying, curiosity killed the Nagler?

Scott

#23 Spartinix

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Posted 21 October 2019 - 04:01 PM

Except it's not 'the' real Nagler 31t5 to begin with. I say open it up -just be careful..and get rid of that orange 'thing'. You can't even sell it like that so really..

Edited by Spartinix, 21 October 2019 - 04:01 PM.


#24 rkelley8493

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Posted 21 October 2019 - 04:43 PM

It should be okay to take it apart because the lenses are fixed together. There are only two main sections of the 31T5, the top half [eye lens group] and bottom half, which is sort of like a built in barlow containing the field lens.

It didn't come with a warning sticker like my 10mm Ethos did. I think the lenses aren't fixed in that one, so decoupling [unscrewing] the body could cause the lenses to fall out of place.



#25 Im2bent

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Posted 21 October 2019 - 05:12 PM

Except it's not 'the' real Nagler 31t5 to begin with. I say open it up -just be careful..and get rid of that orange 'thing'. You can't even sell it like that so really..

Not sure why you are saying its not a "real" Nagler?




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