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Equipment Discussions >> Eyepieces

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bremms
Carpal Tunnel
*****

Reged: 08/31/12

Loc: SC
Re: Eyepiece Comebacks new [Re: Monoeil]
      #6162579 - 10/28/13 01:48 PM

18mm Intes Bertele is a lousy EP. the bright pink coatings look cool.
My vote is for
Zeiss Abbe II
Meade smoothie 5 element super Plossls Those beat the pants off the Celestron sivertops.
Never used a Pretoria, heard good things.


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JustaBoy
Post Laureate
*****

Reged: 06/19/12

Re: Eyepiece Comebacks new [Re: bremms]
      #6162634 - 10/28/13 02:16 PM

I think that the biggest problem with Pretoria sales was the 50° AFOV in the time of the 82° Naglers.

I had the U/O 28mm and the Vernonscope 20mm. I thought they did really well, but I have gone to all refractors now, so they went bye-bye.

Damnit! :-(

-Chuck


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Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Eyepiece Comebacks new [Re: JustaBoy]
      #6162640 - 10/28/13 02:22 PM

Quote:

I think that the biggest problem with Pretoria sales was the 50° AFOV in the time of the 82° Naglers.

I had the U/O 28mm and the Vernonscope 20mm. I thought they did really well, but I have gone to all refractors now, so they went bye-bye.

Damnit! :-(

-Chuck




If I am not mistaken, one of the Pretoria's had a reasonably wide field of view, the other did not.

Jon


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JustaBoy
Post Laureate
*****

Reged: 06/19/12

Re: Eyepiece Comebacks new [Re: Jon Isaacs]
      #6162658 - 10/28/13 02:30 PM

I think that all of them are in accordance with the original design, but I'm wrong about at least something every day:-)

-Chuck


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Jeff Morgan
Postmaster
*****

Reged: 09/28/03

Loc: Prescott, AZ
Re: Eyepiece Comebacks new [Re: Monoeil]
      #6162795 - 10/28/13 03:31 PM

Quote:

Your Bertele looks like a 30mm to me adapted from a microscope eyepiece.

Years ago, I owned an Intes 18mm Bertele eyepiece and it was pretty awful: strong yellow tone and ghosting. Not worth a cheap Plossl.

Reality can be somewhat different from theory...




It's construction is a little odd, I do not know if it was adapted from a binocular, microscope, or built as a telescope eyepiece. It needs a cleaning so I'll post a few better pics when I take it apart.

It does have nice MgFL coatings (which you may be able to see in that picture), no yellow tone noted. We were looking at open clusters in Cass, no ghosts noted but Jupiter would be a better test. It did notably better than the UO Konigs in Round One, but we only spent about 20 minutes with it - more eyepiece time is needed.

I never expected it to replace my Panoptics, but for the price I could hardly go wrong, even if just to get first-hand experience and satisfy curiosity.


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leonard
scholastic sledgehammer
*****

Reged: 10/19/07

Loc: West Virginia
Re: Eyepiece Comebacks new [Re: Jon Isaacs]
      #6163448 - 10/28/13 10:01 PM

Hi Jon


The 16mm is said to have 60 deg. AFOV.
How sad that I owned one and cannot remember .


Leonard


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leonard
scholastic sledgehammer
*****

Reged: 10/19/07

Loc: West Virginia
Re: Eyepiece Comebacks new [Re: Jon Isaacs]
      #6163789 - 10/29/13 12:33 AM

Hello ,


>>>> The issue with the Preforia concept is that it only works in Newtonians and you have to buy one for each focal length. Coma correctors are more practical. <<<<<

The eyepiece was designed to work in fast newtonians so why bring up anything else , so I would not see that as a detrimental.
From what I have read it works just fine in all size newtonian scopes in the F4 to F5 range.
I have no reason to own a Paracorr and do not look forward to owning one . One reason would be weight , I don't like lots of weight at the focuser.
If it were me , using four different FL eyepieces for deep sky , just pop them in and out , no need to adjust anything would be the way to go .
But Pretoria eyepieces never developed pass the first introduction I guess because of the paracorr , which does not mean the paracorr is better or in anyway more practical just that more people went ffor TV eyepieces and the paracorr went with them .
Lets see , 6 elements, great views ,lighter in weight , whats not to like ?????
Take the time to read this eyepiece archive thread by bwilson , called : Pretoria eyepieces pictures , date 10/07 ,everything one would want to know is in the first 3 pages.
Leonard


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Starman1
Vendor (EyepiecesEtc.com)
*****

Reged: 06/24/03

Loc: Los Angeles
Re: Eyepiece Comebacks new [Re: leonard]
      #6163864 - 10/29/13 02:08 AM

But a coma corrector works with all eyepieces, and parfocalizes them all.
Even if the Pretoria eyepieces still existed, they wouldn't satisfy everyone's taste in eyepieces.
Better to have a coma corrector in the scope, I think, whether attached to the focuser or merely inserted into it.


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Jeff Morgan
Postmaster
*****

Reged: 09/28/03

Loc: Prescott, AZ
Re: Eyepiece Comebacks new [Re: leonard]
      #6164096 - 10/29/13 08:10 AM

Yes, a Pretoria would be ideal for a dedicated low-power Milky Way sweeper. Something along the lines of an Astroscan, where a large number of eyepieces would not be used, or even desired.

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greju
Carpal Tunnel
*****

Reged: 10/13/05

Re: Eyepiece Comebacks new [Re: Starman1]
      #6165331 - 10/29/13 08:53 PM Attachment (11 downloads)

Would like to see these Kowa's...

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greju
Carpal Tunnel
*****

Reged: 10/13/05

Re: Eyepiece Comebacks new [Re: greju]
      #6165333 - 10/29/13 08:54 PM Attachment (10 downloads)

...or any of their derivitives.

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jdbastro
sage


Reged: 08/18/07

Loc: W. Coast
Re: Eyepiece Comebacks [Re: MRNUTTY]
      #6165603 - 10/30/13 12:45 AM Attachment (16 downloads)

Quote:

I would like to see a more modern Collins I3 like eyepiece, say in a wide-field or better yet; a zoom!




There is the Micro Monocular which easily adapts for telescope use. It's ocular lens (eyepiece) provides a sharper image across the FOV and a slightly larger apparent FOV vs. the Collins I3.

The Micro is currently shipping.

Here's a pic:

Edited by jdbastro (10/30/13 12:47 AM)


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