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Equipment Discussions >> Eyepieces

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Jeff Morgan
Postmaster
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Reged: 09/28/03

Loc: Prescott, AZ
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: Starman81]
      #6599604 - 06/24/14 03:40 PM

Quote:

I can't believe a Pentax XO 5 went for sub-$300 on AM just yesterday. That was a steal.




It must have set a record for the fastest Astromart sale ever. That guy's mailbox must be exploding.


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Paul G
Post Laureate
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Reged: 05/08/03

Loc: Freedonia
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: Scott99]
      #6599847 - 06/24/14 05:46 PM

Quote:

I've got a nice set of the AP SPL's for very transparent, scatter-free viewing with only 3 lenses. However, the truth is that my 5mm and 7.5mm Tak LE's spend more time in the focuser, just for ease of use and wider field.




Good point. The eye relief is uncomfortably short on the 4 and 6 ZAO's and I usually use an eyepiece with more eye relief. I see more when I'm comfortable.


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Paul G
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Reged: 05/08/03

Loc: Freedonia
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: Scanning4Comets]
      #6599853 - 06/24/14 05:52 PM

Quote:

Also, I don't understand why people complain about "scatter". As long as the detail on planets when doing planetary is good, it doesn't matter to me. I'll take the Delos over everything, every time. They are also awesome for deep sky too. Double duty baby.




I guess since the scatter isn't just around the planet but causes a subtle smearing of planetary detail.

I use Ethos (haven't tried the Delos) in that focal length range and find them very capable planetary eyepieces, indistinguishable from the ZAO's on most nights around here. Subtle differences in scatter are overwhelmed by atmospheric scatter (humidity was 99% for a few days in a row here) in my area. Despite having spent some bucks on minimal glass eyepieces and using them in scopes with low scatter optics I find there are few nights when they show more than less simple designs.


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alnitak22
professor emeritus


Reged: 02/12/11

Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: precaud]
      #6600020 - 06/24/14 07:43 PM

Quote:

And by short, let's say 10mm or less.




Nagler 3-6 zoom.


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Phillip Creed
Idiot Seeking Village
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Reged: 07/25/06

Loc: Canton, OH
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: alnitak22]
      #6600068 - 06/24/14 08:09 PM

I'd have to say my Pentax 7XW and my 10mm Delos are my go-to eyepieces. Yes, there's a lot of elements, but it's *amazing* how planets look in both of these eyepieces and how high the contrast is, even when (gulp) a barlow lens is thrown in the mix.

As someone who prefers to keep my eyeglasses on, just the thought of single-digit eye relief makes me cringe, so I just can't get myself to get short focal length orthos or plossls.

Clear Skies,
Phil


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SteveG
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Reged: 09/27/06

Loc: Seattle, WA
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: REC]
      #6601274 - 06/25/14 01:25 PM

Quote:

Steve, what barlow are you using?

I never thought about barlow on my Brandon 16mm, I just use a 6.7mm EP for highest power in some of my scopes. I'll have to give that a try on Saturn next time out.




I'm actually using (3) different barlows, all of which do not degrade the image and retain the high-contrast of the Brandon's. If I had to choose a favorite, it would be the Orion Trimag. The TV 3x is also very nice.

I find these barlowed Brandon's to be better than my Pentax XW's.


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REC
Post Laureate
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Reged: 10/20/10

Loc: NC
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: SteveG]
      #6601536 - 06/25/14 04:18 PM

Wow, better than the XW's! I'll have to try out the 16mm in my 2.5x Powermate on Saturn my next time out.

Thanks!


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bgi
sage
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Reged: 12/01/05

Loc: Ga
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: alnitak22]
      #6602496 - 06/26/14 08:55 AM

Quote:

Quote:

And by short, let's say 10mm or less.




Nagler 3-6 zoom.




^^^ What he said.


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PJ Anway
Double-Star Observer
*****

Reged: 06/04/03

Loc: North Coast
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: precaud]
      #6602584 - 06/26/14 09:46 AM

ZAO-4, XO-5, ZAO-6, SMC-7

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Greg77
super member


Reged: 05/02/09

Loc: Slovenia, EU
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: precaud]
      #6602766 - 06/26/14 11:52 AM

...lowest scatter, short FL eyepiece(s)?

Thats easy...TMB SuperMonos.

CS!

Greg


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penguinx64
Pooh-Bah


Reged: 11/12/13

Loc: Holland
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: Greg77]
      #6603465 - 06/26/14 06:55 PM

8mm RKE

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precaud
Pooh-Bah
*****

Reged: 12/05/12

Loc: north central New Mexico
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: penguinx64]
      #6618135 - 07/05/14 02:28 PM

So, the next question is, what are the most significant contributing factors to diminish eyepiece scatter? From what I've read, it appears to be a combination of a) lens polish quality, and b) coatings. Is that so? Anything else?

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SteveG
Post Laureate
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Reged: 09/27/06

Loc: Seattle, WA
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: precaud]
      #6618182 - 07/05/14 02:52 PM

Quote:

So, the next question is, what are the most significant contributing factors to diminish eyepiece scatter? From what I've read, it appears to be a combination of a) lens polish quality, and b) coatings. Is that so? Anything else?




Design


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precaud
Pooh-Bah
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Reged: 12/05/12

Loc: north central New Mexico
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: SteveG]
      #6618724 - 07/05/14 09:13 PM

I was hoping for something a little more detailed than that...

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TPMack
sage


Reged: 03/06/06

Loc: VA
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: precaud]
      #6619639 - 07/06/14 01:22 PM

Zeiss 6mm monocentric.

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Jeff Morgan
Postmaster
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Reged: 09/28/03

Loc: Prescott, AZ
Re: What is your lowest scatter, short FL eyepiece(s)? new [Re: precaud]
      #6620772 - 07/07/14 12:45 AM

Quote:

So, the next question is, what are the most significant contributing factors to diminish eyepiece scatter? From what I've read, it appears to be a combination of a) lens polish quality, and b) coatings. Is that so? Anything else?




Roland Christen has some interesting things to say on optics on the AP-UG. As much as I like CN, he will teach you 10x as much as anyone here.

To whet your appetite, properly applied coatings matter little for scatter (coatings give you transmission). Scatter is an inherent quality of the glass itself (imperfections, not absorption which is minimal). Also, the "crud" that gets between the lenses. And of course polish is important. He cites Zeiss in particular as polishing their legendary ZAO's twice as long as required.


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