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Equipment Discussions >> Eyepieces

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Tamiji Homma
Carpal Tunnel
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Reged: 02/24/07

Loc: California, USA
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Paul Schroeder]
      #5939625 - 06/25/13 12:08 PM

Hi Paul,

It did have big impact to image. Here is an example (ES 30mm):


I cleaned it with Baader Optical Wonder and then distilled water. It is gone.

Tammy


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csrlice12
Postmaster
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Reged: 05/22/12

Loc: Denver, CO
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Tamiji Homma]
      #5939635 - 06/25/13 12:16 PM

"I cleaned it with Baader Optical Wonder and then distilled water. It is gone."

and hopefully, so's that eyepiece cup.


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Matt Wallin
member
*****

Reged: 01/29/12

Loc: Portland, OR
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: csrlice12]
      #5940002 - 06/25/13 03:27 PM

My ES82 30mm got badly smudged by the bottom cap one time and I was so disappointed with it's views, it really affects the view, big time. I was comparing it to my ES100 20mm on M31, the contrast was so bad in comparison that I almost considered selling it until I noticed the nasty smear on the field lens!

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Paul Schroeder
super member
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Reged: 06/05/03

Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Matt Wallin]
      #5940185 - 06/25/13 05:30 PM

Quote:

My ES82 30mm got badly smudged by the bottom cap one time and I was so disappointed with it's views, it really affects the view, big time. I was comparing it to my ES100 20mm on M31, the contrast was so bad in comparison that I almost considered selling it until I noticed the nasty smear on the field lens!




Thanks all for the feedback, it's very helpful!

Previously I had an ES 30mm 82 degree that I compared to a Nagler 31T5, and I didn't think the ES was that close across the entire field of view.

However, I also don't remember checking whether the field lens had a smudge.

I might just have to re-try the comparison with the 31T5 -

Paul


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Fred1
Carpal Tunnel
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Reged: 09/19/07

Loc: Somewhere in the Orion Spur
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Paul Schroeder]
      #5940259 - 06/25/13 06:34 PM

I posted this in another thread but I don't mind repeating myself. I solved the problem with a Kim Wipe stuffed into the cap (best tissues for cleaning, BTW, no lint, no smear) and the barrel glass stays 100% smudge free, even though I use the soft yellow Eyepiece Caps on all my EPs as they stay pliable in winter and easy to find when dropped in the dark.

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DHurst
super member


Reged: 03/10/06

Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Fred1]
      #5942513 - 06/27/13 04:14 AM

Quote:

I solved the problem with a Kim Wipe stuffed into the cap




Forgive me... but that's not a solution! Sounds like a way to cause more problems! The bottom cap should protect the field lens! Bottom line!

Be careful, the lens is very close to the bottom of the ES20 barrel!

Just give them a call if you have an issue.
I feel assured ES has and will respond appropriately!


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vonuscyg
member
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Reged: 03/21/11

Loc: Southern CA
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: DHurst]
      #5942582 - 06/27/13 06:42 AM

I have the same smudging problem with my 20mm 100* ES eyepiece. I cleaned it off, and under normal house lighting, it looked sparkling clean.
However, when I was observing at my dark sky location, I was able to see a faint smudge on the field lens under the subdued light of my red flashlight. It appears that the lens cap may have left a permanent, but ghostly stain.
I doubt it affects the views though.


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slack
sage
*****

Reged: 05/02/12

Re: ES 100 caps leaving smudges - impacting reviews? new [Re: DHurst]
      #5943370 - 06/27/13 04:17 PM

Quote:

Quote:

I solved the problem with a Kim Wipe stuffed into the cap




Forgive me... but that's not a solution! Sounds like a way to cause more problems! The bottom cap should protect the field lens! Bottom line!

Be careful, the lens is very close to the bottom of the ES20 barrel!




It may not be a solution, but it's less likely to cause more problems than a replacement non-smudging bottom plastic cap that is in still in contact with the field lens. After all, KimWipes are widely used by professionals to clean the finest and costliest optics.


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csrlice12
Postmaster
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Reged: 05/22/12

Loc: Denver, CO
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: slack]
      #5943378 - 06/27/13 04:24 PM

A hard cap like the ones from Televue don't flex, so they won't touch the field lens. I think I paid $2 for mine.

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Matt Wallin
member
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Reged: 01/29/12

Loc: Portland, OR
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: slack]
      #5943444 - 06/27/13 05:07 PM

The field lenses arent' right *at* the bottom, it's just that the rubber cup flexes that much! A rigid cap would definitely fix the problem. IMHO, having ANYTHING, even a pro-grade cleaning cloth, in constant contact with my optics seems to just be asking for trouble, it may have worked for you so far, but why use a method with such potential for damage? One piece of grit, landing in the wrong place, vibrating against my field lens every mile of rough road I drive? No, thanks.

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Matt Wallin
member
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Reged: 01/29/12

Loc: Portland, OR
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Matt Wallin]
      #5943523 - 06/27/13 05:51 PM

Just put in a quick call to ES, they we eager to send me new bottom caps for my ES82 and ES100s, free of charge. Gotta love that, standing behind your products! Thanks ES!

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Fred1
Carpal Tunnel
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Reged: 09/19/07

Loc: Somewhere in the Orion Spur
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: slack]
      #5943525 - 06/27/13 05:52 PM

Quote:

Quote:

Quote:

I solved the problem with a Kim Wipe stuffed into the cap




Forgive me... but that's not a solution! Sounds like a way to cause more problems! The bottom cap should protect the field lens! Bottom line!

Be careful, the lens is very close to the bottom of the ES20 barrel!




It may not be a solution, but it's less likely to cause more problems than a replacement non-smudging bottom plastic cap that is in still in contact with the field lens. After all, KimWipes are widely used by professionals to clean the finest and costliest optics.




That's right, Slack. Anyone that's ever used a Kim Wipe knows that. I do the same with my 17mm Ethos. Plus, those yellow EyepieceCaps are better than losing another black cap in the dark or wasting perfectly good observing time looking for one in the grass.


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Starman1
Vendor (EyepiecesEtc.com)
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Reged: 06/24/03

Loc: Los Angeles
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: vonuscyg]
      #5943664 - 06/27/13 07:19 PM

Quote:

I have the same smudging problem with my 20mm 100* ES eyepiece. I cleaned it off, and under normal house lighting, it looked sparkling clean.
However, when I was observing at my dark sky location, I was able to see a faint smudge on the field lens under the subdued light of my red flashlight. It appears that the lens cap may have left a permanent, but ghostly stain.
I doubt it affects the views though.



Try ROR (ror.net). It will safely clean the glass down to the coatings, leaving no stain behind.


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DHurst
super member


Reged: 03/10/06

Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Matt Wallin]
      #5944194 - 06/28/13 03:21 AM

Quote:

The field lenses arent' right *at* the bottom, it's just that the rubber cup flexes that much! A rigid cap would definitely fix the problem...




I measured 5mm from the bottom edge of the barrel to the center of the field lens. *at* is relative! I don't know about you, but to me half a centimeter is pretty tight! Just got my cap from ES today. It's no TV cap but way more rigid than the orig.


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Scanning4Comets
Markus
*****

Reged: 12/26/04

Re: ES 100 caps leaving smudges - impacting reviews? new [Re: DHurst]
      #5944252 - 06/28/13 06:09 AM

I hate to say this, but people really need to stop complaining about this and just contact ES about it....they will send you any free bottom caps you need free of charge if you can prove you own any of the three focal lengths in the 100 degree series. It's a bottom cap and an easy fix if you think about it.

Heck, you could even order one from Agena Astro for next to nothing !!! C'mon people, it's not that big of a deal really. They know they made a mistake and are helping everybody out they can. The people that work at ES who have contacted me have been very polite and the customer service has been over the top for me personally!!!

Cheers,


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GeneT
Ely Kid
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Reged: 11/07/08

Loc: South Texas
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: Paul Schroeder]
      #5945407 - 06/28/13 07:14 PM

Quote:

I checked to see if the soft cap on the bottom of the eyepiece was in contact with the field lens. Sure enough it had been, and had left a fairly good-sized smudge.




I hope this was just an anomaly. Anyone else have this problem?


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GeneT
Ely Kid
*****

Reged: 11/07/08

Loc: South Texas
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: GeneT]
      #5945416 - 06/28/13 07:18 PM

Quote:

Quote:

I checked to see if the soft cap on the bottom of the eyepiece was in contact with the field lens. Sure enough it had been, and had left a fairly good-sized smudge.




I hope this was just an anomaly. Anyone else have this problem?




I see where ES has changed the caps, and sent customers new ones at no charge. Case closed?


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russell23
Post Laureate
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Reged: 05/31/09

Loc: Upstate NY
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: GeneT]
      #5946185 - 06/29/13 09:23 AM

Quote:

Quote:

I checked to see if the soft cap on the bottom of the eyepiece was in contact with the field lens. Sure enough it had been, and had left a fairly good-sized smudge.




I hope this was just an anomaly. Anyone else have this problem?




Yes. When I picked up a used 14mm ES100 it came with a smudge just like the photo shown on this thread. It cleaned up and I switched to a hard cap and then there was no problem.

Dave


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vonuscyg
member
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Reged: 03/21/11

Loc: Southern CA
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: russell23]
      #5947224 - 06/29/13 09:46 PM Attachment (8 downloads)

I received a replacement lens cap from ES today, only two days after requesting it. That was quick.

The new, hard cap is on the left. It seems to fit even looser than the original soft cap, and it doesn't look as well made as the soft one. Hmmm, I might just keep using the original caps, being careful to place the eyepiece eye lens end first into the eyepiece case. I suspect in the cold of the observing nights, the caps would fall off even easier.

Thanks Don for the ROR advice.


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azure1961p
Postmaster
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Reged: 01/17/09

Loc: USA
Re: ES 100 caps leaving smudges - impacting reviews? new [Re: star drop]
      #5947281 - 06/29/13 10:45 PM

I don't ever use eyepiece caps ever. The ocular case when closed is dust proof and has desiccant to insure dryness. I'd never cap my oculars particularly where it could conceivably have air that's moist trapped under the cap even the the case is desiccant dry.

Pete


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