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Equipment Discussions >> Eyepieces

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astrodon
Carpal Tunnel
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Reged: 04/07/05

Loc: Portland, OR, USA
Re: List of Paracorr settings for all brands of EP new [Re: Lawrence Sayre]
      #1768673 - 08/09/07 08:42 PM

Lawrence-
In the photo of the Paracorr with the tunable top you can see that setting 5 is the lowest, for in order to reach that setting the tunable top with the slot in it must descend in order for the set screw to reach that level.
Hope I helped to clear this up, I know it is hard to get just by looking at the image,
~Don


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Lawrence Sayre
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Re: List of Paracorr settings for all brands of EP new [Re: astrodon]
      #1768777 - 08/09/07 09:31 PM Attachment (429 downloads)

OK, I finally realize that my intuitive view of the 5 being higher in the picture than the 1 was all wet, and I now trust that 5 is the lowest and 1 is the highest setting. Obviously the slide lever has to go up for the tunable top to go down, and visa versa. Thank you Don and Don!!! With that to go on, I've re-worked my spreadsheet once again, and I'm attaching it right here. I'm also now willing to believe that the TeleVue website chart is using the taller adapter for its 1.25" eyepieces. Please kick the tires with this spreadsheet, and let me know if it gives correct tunable top settings across the board.

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

Loc: Los Angeles
Re: List of Paracorr settings for all brands of EP new [Re: Lawrence Sayre]
      #1768841 - 08/09/07 09:57 PM

Lawrence,
It worked for my 31 Nagler and my Type 6 Naglers.
It didn't work for the 17 Nagler, with a field stop to shoulder dimension of -0.03"
The spreadsheet erroneously gives a setting of 5 instead of 3.


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Starman1
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Reged: 06/24/03

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Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1768866 - 08/09/07 10:07 PM

Lawrence,
I accidentally included the adapter height for a 2" eyepiece.
Doh!
Your calculator works fine.
Don


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Lawrence Sayre
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Reged: 10/16/04

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Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1768948 - 08/09/07 10:55 PM

Thanks!!!

Whew, you had me worried there for a bit. I was beginning to wonder if I would ever get it right. A sanity tester for sure.


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Keith
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Reged: 05/14/05

Loc: Costa Mesa, CA USA
Re: List of Paracorr settings for all brands of EP new [Re: Lawrence Sayre]
      #1786829 - 08/19/07 02:17 PM

for the 30mm 1rpd, setting 3, works suprisingly well. When I later aquired the real deal 30mm widescan III, suprisingly, it wasnt as well correctable with the paracorr, possibly because it has a wider field stop. I kept both eyepieces. Since I also aquired a nice f10 OTA, I use the WSIII with it, and my most recently aquired 31mm nagler with the dob, with or without the paracorr. I have the older photo/visual model, and the vignetting bothers me, so I will likely add the visual model in the future, and keep the other for my 8"f4 for imaging.

my 2c in the 8.8 UWA discussion, I used it in the lowest setting (5) with the included 1.25 adapter in 1.25 mode, like suggested for the 9mm nagler and it worked very well. I dont think I tried it with the 14mm yet, which I aquired more recently.


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Starman1
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Reged: 06/24/03

Loc: Los Angeles
Re: List of Paracorr settings for all brands of EP new [Re: Keith]
      #1787397 - 08/19/07 07:10 PM

I went back and looked for my records:
14mm UWA (used as 2")--setting 1
8.8mm UWA (used as 2")--setting 5

The 31 Nagler would be better corrected at setting 6. The fact there is no setting 6 shows the Paracorr was designed long before the 31 Nagler. I find it "tolerable" with setting 5, however.


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Zooball
journeyman


Reged: 02/05/07

Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1799454 - 08/25/07 11:49 AM

Thanks Don,

You just saved me a lot of work. I have both of those EPs and a brand new Paracorr PCV-2000 still snug in the box waiting for dark skies.


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sixela
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Reged: 12/23/04

Loc: Boechout, Belgium
Re: List of Paracorr settings for all brands of EP new [Re: Lawrence Sayre]
      #1805439 - 08/28/07 11:54 AM

Quote:

I woke up early this morning and I've been attempting to make a spreadsheet to calculate the ideal Paracorr tunable top setting based solely upon the field stop location of the eyepiece, and although in its present state it appears to give correct answers for all of the 2" TeleVue eyepieces, it gives incorrect answers for all of the 1.25" TeleVue eyepieces.




Probably means you haven't accounted for the extra 9.6mm caused by the Paracorr 2"-1.25" adapter.

Edit: never mind - late to the party...


Edited by sixela (08/28/07 11:56 AM)


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bkushner
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Re: List of Paracorr settings for all brands of EP new [Re: Lawrence Sayre]
      #1885054 - 10/04/07 08:36 AM

What about Ethos?

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

Loc: Los Angeles
Re: List of Paracorr settings for all brands of EP new [Re: bkushner]
      #1885980 - 10/04/07 02:49 PM

The position of the Ethos' focal plane is only 0.02" different than the Type 6 Naglers. That means setting 4 would be correct--the Nagler Type 6s WITH the adapter, and the Ethos WITHOUT an adapter.
I don't believe you could get the Ethos close enough to the Paracorr lens if used with a 1-1/4" adapter.


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sixela
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Reged: 12/23/04

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Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1886417 - 10/04/07 05:55 PM

Can't. In 1.25" mode in a 2"-1.25" adapter, it doesn't insert with the 1.25" barrel completely seated in the adapter, because the 2" barrel contacts the adapter.

When used this way, the focal plane is much too far from a Paracorr lens, even with a zero-length adapter.

Ethos: 2" mode, top fully pulled out.


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Starman1
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Reged: 06/24/03

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Re: List of Paracorr settings for all brands of EP new [Re: sixela]
      #1887162 - 10/04/07 11:30 PM

It works fine in a TeleVue "High-Hat" 1-1/4" adapter, but, in general, the Ethos should be used as a 2" eyepiece in 2" focusers. And in the Paracorr too.

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Mr. Bill
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Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1887870 - 10/05/07 11:08 AM

Anybody know offhand what the settings for the 14, 10.5 and 7 mm Pentax XLs is?

I say "is" because they are all parfocal.



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sixela
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Reged: 12/23/04

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Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1888469 - 10/05/07 03:10 PM

Quote:

It works fine in a TeleVue "High-Hat" 1-1/4" adapter,




That doesn't fix the issue either, because the reason it works is because the high-hat adds extra length.


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Mr. Bill
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Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1888566 - 10/05/07 03:46 PM

Quote:

It works fine in a TeleVue "High-Hat" 1-1/4" adapter, but, in general, the Ethos should be used as a 2" eyepiece in 2" focusers. And in the Paracorr too.




That's what TV's Ethos instruction sheet plainly says....


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Starkler
scholastic sledgehammer


Reged: 11/04/05

Loc: Australia, Melbourne
Re: List of Paracorr settings for all brands of EP new [Re: Mr. Bill]
      #1990375 - 11/16/07 09:02 PM

Quote:

Anybody know offhand what the settings for the 14, 10.5 and 7 mm Pentax XLs is?

I say "is" because they are all parfocal.






The Pentaxs appear to perform best with the tunable top set to the highest setting (which requires the max amount of focuser in-travel). I had to cut 15mm from my truss poles to accommodate but its worth it

I find the paracorr works wonderfully as a field flattener, nicely mitigating the often criticised field curvature in the 14 and 21mm pentaxs

A note of caution! A friend handed me an OIII filter to try on my 31nagler. Dont try it as it hits the paracorr lens



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

Loc: Los Angeles
Re: List of Paracorr settings for all brands of EP new [Re: Starkler]
      #1990803 - 11/17/07 01:31 AM

Quote:


A note of caution! A friend handed me an OIII filter to try on my 31nagler. Dont try it as it hits the paracorr lens





Ouch.
Note: 2" filters should be threaded on the bottom of the Paracorr for safety's (and convenience's) sake.
And don't use 1-1/4" filters on the bottom of the dual 1-1/4"/2" eyepieces when used as 2" eyepieces either. The filter will hit the lens if a lower setting is used.
If you use a Paracorr, it is safer to use all 2" filters and thread them on the bottom of the Paracorr.


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Olivier Biot
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Reged: 04/25/05

Loc: 51°N (Belgium)
Re: List of Paracorr settings for all brands of EP new [Re: Starman1]
      #1993128 - 11/18/07 09:24 AM

For that reason I'm designing a 2" filter wheel that goes right below the ParaCorr.

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Shawn H
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Re: List of Paracorr settings for all brands of EP new [Re: Lawrence Sayre]
      #2054266 - 12/16/07 07:50 AM

Lumicon sells thier coma correcter for about 100 euros less than TV's paracorr in France, I'd love to hear if anyone has done a side by side comparison!

Shawn Haggerty Avignon, France


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