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Equipment Discussions >> Eyepieces

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johnnyha
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Leica ASPH Zoom Paracorr setting
      #5653581 - 01/31/13 03:34 AM

Any idea what the best Paracorr 1 setting is for the Leica ASPH Zoom with 2" adapter? My preliminary tests show it appears to need to be set with the tunable top all the way down (setting 5). Even this is not enough "in", but at this setting I'm happy to report I do get a sharp image across 100% of the FOV in my f4.65 dob. How 'bout y'all?

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Doug Culbertson
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Re: Leica ASPH Zoom Paracorr setting new [Re: johnnyha]
      #5653671 - 01/31/13 06:30 AM

That's the setting that I use as well.

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VĂ­ctor MartĂ­nez
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Reged: 02/05/07

Loc: Cadiz - Spain
Re: Leica ASPH Zoom Paracorr setting new [Re: johnnyha]
      #5653690 - 01/31/13 06:48 AM

Johnny, you say:
"I'm happy to report I do get a sharp image across 100% of the FOV in my f4.65 dob".
This is only with the eyepiece and Paracorr, or adding a Barlow lens also to the optical train


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btom
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Re: Leica ASPH Zoom Paracorr setting new [Re: VĂ­ctor MartĂ­nez]
      #5653754 - 01/31/13 07:45 AM

Ditto that question?

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Doug Culbertson
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Re: Leica ASPH Zoom Paracorr setting new [Re: btom]
      #5653852 - 01/31/13 08:59 AM

In my case, I get sharp stars almost all the way across the fov at all magnifications with the Leica ASPH. I can't say for sure that it's 100%, but it's at least as good as my 31mm Nagler at the same setting. Not perfect, as it could stand a bit more inward travel, but close enough for rock and roll. FWIW, that's in my 14.5" f/4.3 Starmaster.

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johnnyha
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Re: Leica ASPH Zoom Paracorr setting new [Re: VĂ­ctor MartĂ­nez]
      #5654895 - 01/31/13 07:00 PM

Quote:

Johnny, you say:
"I'm happy to report I do get a sharp image across 100% of the FOV in my f4.65 dob".
This is only with the eyepiece and Paracorr, or adding a Barlow lens also to the optical train




This is with only the Leica ASPH zoom and a Paracorr 1, no barlow. Sharp to the edge! I was testing on the Moon so there was no ambiguity, 100% of the FOV was clean and sharp.

With a barlowed Leica ASPH zoom I find the Paracorr is not needed, I get a sharp image across the FOV.

With an unbarlowed, unParacorred Leica ASPH zoom I get a soft image starting 2/3 of the way to the edge.


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VĂ­ctor MartĂ­nez
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Reged: 02/05/07

Loc: Cadiz - Spain
Re: Leica ASPH Zoom Paracorr setting new [Re: johnnyha]
      #5655595 - 02/01/13 05:18 AM

Can you tell me anything about focus travel of this eyepiece + Barlow Antares 1.6X compared to an eyepiece Ethos. In my focuser, a JMI Ev-1n, I have focus with all my eyepieces, from ES 30 mm until 10 mm Ethos, all barlowed also with Antares 1,6X included.

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VĂ­ctor MartĂ­nez
sage


Reged: 02/05/07

Loc: Cadiz - Spain
Re: Leica ASPH Zoom Paracorr setting new [Re: VĂ­ctor MartĂ­nez]
      #5658425 - 02/02/13 04:10 PM

Nobody can answer this question?. Anyone could know what is the value of the field stop of this eyepiece?.

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johnnyha
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Re: Leica ASPH Zoom Paracorr setting new [Re: VĂ­ctor MartĂ­nez]
      #5658817 - 02/02/13 07:59 PM

I actually went out specifically to check last night Victor but it had clouded up, and looks like rain tonight.

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andydj5xp
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Re: Leica ASPH Zoom Paracorr setting new [Re: VĂ­ctor MartĂ­nez]
      #5659321 - 02/03/13 03:13 AM

Quote:

Anyone could know what is the value of the field stop of this eyepiece?.




Victor,

the field stop diameters for the various ASPH settings can be seen here

Info about the infocus requirements as compared to some other eyepieces is given here

I don't remember the infocus requirement for the Antares 1.6x Barlow, but normally the focus travel with and without Barlow is very similar if not the same. Therefore, if the Leica ASPH can be fosused stand alone it will also achieve focus with the Antares Barlow.

Andreas


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VĂ­ctor MartĂ­nez
sage


Reged: 02/05/07

Loc: Cadiz - Spain
Re: Leica ASPH Zoom Paracorr setting new [Re: andydj5xp]
      #5659371 - 02/03/13 05:08 AM

Johnny, thanks for the inconvenience you are taking to check it, I really appreciate.
Andreas thank you.
Well, based on the Tammy says in his post, the distance of the field stop of Leica zoom with the Starlight adapter, in respect of the focal plane, would be of -16'9 mm (-0'66"), always taking values of Televue site of approximately location of field stop.

Edited by Víctor Martínez (02/03/13 09:01 AM)


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johnnyha
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Re: Leica ASPH Zoom Paracorr setting new [Re: VĂ­ctor MartĂ­nez]
      #5660728 - 02/03/13 08:57 PM

Victor - the Leica ASPH zoom/1.6X Antares barlow requires 1/4" more infocus than the zoom alone. The zoom alone is parfocal with the 31T5 Nagler.

The 13 Ethos requires 3/4" more outfocus than the 1.6X barlowed Leica ASPH zoom.


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VĂ­ctor MartĂ­nez
sage


Reged: 02/05/07

Loc: Cadiz - Spain
Re: Leica ASPH Zoom Paracorr setting new [Re: johnnyha]
      #5661104 - 02/04/13 03:34 AM

The 31T5 Nagler is, in theory, parfocal with 21mm Ethos. Consequently, the Leica ASPH zoom/1.6X Antares barlow requires 1/4" (6'35mm) more infocus that 21mm Ethos. According to the TeleVue Ethos eyepieces and in theory, the 13mm Ethos requires 0'9" (22'86mm) more outfocus than the 1.6X barlowed Leica ASPH zoom. With this I can get an idea that the travel focus I need.
Thank you very much Johnny.


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