Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
Get a Cloudy Nights T-Shirt Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu uh, User

Equipment Discussions >> Refractors

Pages: 1 | 2 | 3 | 4 | (show all)
la200o
Carpal Tunnel


Reged: 09/09/08

Loc: SE Michigan, USA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: jrbarnett]
      #5552866 - 12/03/12 09:20 PM

Though he may not be a fan, Jim seems to be outvoted by the many favorable reviews and enthusiastic users of the NP101.

Bill


Post Extras: Print Post   Remind Me!   Notify Moderator  
cloud_cover
professor emeritus


Reged: 08/17/10

Loc: Restaurant at the End of the U...
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: la200o]
      #5553123 - 12/03/12 11:46 PM

Hello!
I think the most important question is do you ever intend to stick a camera into the telescope? If yes, then the NP-101 is the best choice (actually the only choice unless you like to play with field flatteners, which adds cost to your whole setup anyway)
I personally use the NP-101 for both visual and AP. I find its contrast is excellent and looking at stars through it is almost sublime, compared with a previous 80ED doublet I had an a current 8" SCT (The SCT is undoubtedly brighter, but the NP-101 view is nicer)
I'd also like to point out that although the TV-101 has a longer focal length, this difference can be compensated for by using shorter focal length eyepieces. They both have (roughly) the same maximum useful magnification anyway)
How much is the difference in price, used? If its not significant, then I suggest going for the NP-101 instead.


Post Extras: Print Post   Remind Me!   Notify Moderator  
KWB
Postmaster
*****

Reged: 09/30/06

Loc: Westminster,Co Elev.5400 feet
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: la200o]
      #5553148 - 12/04/12 12:01 AM

Quote:

Though he may not be a fan, Jim seems to be outvoted by the many favorable reviews and enthusiastic users of the NP101.

Bill



Everybody is entitled to their opinion,and no, we aren't running an election in this thread,nor do we need to make reference to anothers likes or dislikes. One persons eye for beauty can be anothers eyesore.

Stating your viewpoint once, on-topic and in a civil manner, in a thread is usually sufficient.


Post Extras: Print Post   Remind Me!   Notify Moderator  
la200o
Carpal Tunnel


Reged: 09/09/08

Loc: SE Michigan, USA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: KWB]
      #5553495 - 12/04/12 07:58 AM

I fail to see how my comment is uncivil.

Regards,

Bill

Edited by la200o (12/04/12 08:02 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Lt 26
scholastic sledgehammer
*****

Reged: 02/19/09

Loc: Northwest Illinois
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: KWB]
      #5553501 - 12/04/12 08:01 AM

1) the 102 cost less, a lot less new, a few Ethos less.

2) the 102 is shorter and lighter than a 101 with a Barlow.

3) you can drop kick a 102 across a field and the only damage would be to your foot.

Dereck


Post Extras: Print Post   Remind Me!   Notify Moderator  
la200o
Carpal Tunnel


Reged: 09/09/08

Loc: SE Michigan, USA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: Lt 26]
      #5553504 - 12/04/12 08:04 AM

Dereck, alas, you can't buy new 102, since the scope's been discontinued.

Bill


Post Extras: Print Post   Remind Me!   Notify Moderator  
NHRob
Post Laureate
*****

Reged: 08/27/04

Loc: New Hampshire
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: la200o]
      #5553615 - 12/04/12 09:23 AM

Also, using a TV-102 has been shown to:

* increase male virility
* stop hair loss
* increase stamina and energy level
* contribute to fat loss
* improve memory function

and also lead to a general feeling of well being.




Post Extras: Print Post   Remind Me!   Notify Moderator  
la200o
Carpal Tunnel


Reged: 09/09/08

Loc: SE Michigan, USA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: NHRob]
      #5553650 - 12/04/12 09:50 AM

Rob, you've given me more reasons not to sell my 102!

Bill


Post Extras: Print Post   Remind Me!   Notify Moderator  
Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: Lt 26]
      #5553666 - 12/04/12 10:00 AM

Quote:



2) the 102 is shorter and lighter than a 101 with a Barlow.






I put the Barlow in the diagonal, the length of NP-101 does not change. The Barlow weighs 76 grams.

Besides being more compact, the big thing about the NP-101 is that it does it all, 15x to 300x with zero field curvature at the low end and perfect color correction at the high end.

Sure the TV-102 represents a better value, the Synta ED-100s are much better values than either scope. In this price range, I suspect one is looking for the better scope and the NP-101 is the better scope.

Jon


Post Extras: Print Post   Remind Me!   Notify Moderator  
la200o
Carpal Tunnel


Reged: 09/09/08

Loc: SE Michigan, USA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: Jon Isaacs]
      #5553720 - 12/04/12 10:39 AM

+1

Post Extras: Print Post   Remind Me!   Notify Moderator  
stratocaster
sage
*****

Reged: 10/27/11

Re: TELEVUE 102 VS TELEVUE NP101 new [Re: Jon Isaacs]
      #5553889 - 12/04/12 12:32 PM

Quote:

...the big thing about the NP-101 is that it does it all, 15x to 300x with zero field curvature...




Jon, I've started to notice what I'm now considering inevitable FC in my refractor using 100 degree eyepieces as a "typical" fundamental refractor design issue - not unlike coma in a reflector. But I remember you mentioning in previous threads that you have no field curvature with the NP101 and I always wondered what it was about the 101's design that eliminated FC that might be considered "not typical". In this thread it appears the NP101 was designed more for imaging. Is this why the 101 has no FC - because it has already been corrected for AP use while perhaps most other refractors require a field flattener?


Post Extras: Print Post   Remind Me!   Notify Moderator  
Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: stratocaster]
      #5554028 - 12/04/12 01:45 PM

The NP-101 is designed for visual and photography. NP stands for Nagler-Petzval. A Petzval is a 4 element design that has two groups of two element,one at the front one, in the rear.

The NP-101 is the most recent offering in a long line of TeleVue Petzval refractors that include the MPT, the various versions of the Genesis and the TV-101. Uncle Al loves big, widefield views and combined with his eyepieces, the NP -101 is about as perfect as it gets.

jon


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mr Onions
Two Time International Photographical Competition Winner
*****

Reged: 04/14/07

Loc: Newcastle upon Tyne.
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: Jon Isaacs]
      #5554063 - 12/04/12 02:08 PM

The shorter tube of the NP 101 might make it easier when viewing directly overhead at the zenith,depending on your mount of course.
And you might split tight doubles easier at very high powers with the NP101.
Although you're probably talking 200x+ to see an advantage.


Post Extras: Print Post   Remind Me!   Notify Moderator  
jrbarnett
Eyepiece Hooligan
*****

Reged: 02/28/06

Loc: Petaluma, CA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: la200o]
      #5554185 - 12/04/12 03:37 PM

I take great solace in being outvoted, Bill. After all, the majority of our countrymen believe in all sorts of superstitious nonsense that isn't true. For example, more Americans believe that the world will end on December 21 of this year due to a Maya prophecy than can identify North America on a globe.

- Jim


Post Extras: Print Post   Remind Me!   Notify Moderator  
snommisbor
professor emeritus
*****

Reged: 06/15/09

Loc: Cedar Park, TX
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: jrbarnett]
      #5554223 - 12/04/12 04:15 PM

I hear ya Jim, I felt the same way LOL. I thought for visual only people would recommend the 102 as I did. The NP101 is great I had its predecessor and the views were great but I needed the more powerful EP's to get close. But since I used it mainly for AP I just enjoyed my 13 Ethos at 40X and 7 Nagler at 77X. Still waiting for that TEC 140 to come in. Being without a scope has me going through withdrawals.

Post Extras: Print Post   Remind Me!   Notify Moderator  
sydney
super member


Reged: 04/07/10

Loc: Upstate NY
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: enniot1]
      #5554356 - 12/04/12 05:52 PM

Roland Christen wrote in "Notes on Star Testing Telescopes"

"Every Apo lens I have ever star tested, even ones that tested close to 1/20 wave P-V, shows different inside and outside patterns of interference. This is normal...

... If the outer rings are identical on either side of focus, there is no significant spherical aberration."

http://geogdata.csun.edu/~voltaire/roland/startest1.html

Al Nagler once told me that about the outer ring as well for testing a refractor.

p.s there is nothing like the wide field view through an NP101/NP101is.


Post Extras: Print Post   Remind Me!   Notify Moderator  
jrbarnett
Eyepiece Hooligan
*****

Reged: 02/28/06

Loc: Petaluma, CA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: sydney]
      #5554454 - 12/04/12 06:57 PM

I'm pretty sure that Roland is talking about triplets, not doublets. He doesn't consider doublets "apochromats".

The NP is a doublet with a corrector set in the rear. It should, as Televue employee tigerider claims on this thread, show a perfectly symmetrical star test if perfect, just like any other doublet.

Regards,

Jim

Edited by jrbarnett (12/04/12 06:59 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
la200o
Carpal Tunnel


Reged: 09/09/08

Loc: SE Michigan, USA
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: jrbarnett]
      #5554512 - 12/04/12 07:39 PM

Jim, are the FSQ's also "doublets"?

Regards,
Bill

p.s. This will all be moot on Dec 22d anyway!


Post Extras: Print Post   Remind Me!   Notify Moderator  
idealistic
scholastic sledgehammer
*****

Reged: 12/31/10

Loc: massachusetts
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: la200o]
      #5554529 - 12/04/12 07:45 PM

"Double doublets"

Post Extras: Print Post   Remind Me!   Notify Moderator  
Levine
Pooh-Bah
*****

Reged: 03/24/06

Loc: 40° 47' 52" N / 85° 49' 14" ...
Re: TELEVUE 102 VS TELEVUE NP101 new [Re: idealistic]
      #5554573 - 12/04/12 08:17 PM

Quote:

"Double doublets"




Quadruplet!



Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | 3 | 4 | (show all)


Extra information
28 registered and 58 anonymous users are browsing this forum.

Moderator:  Scott in NC, FirstSight, panhard, star drop 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 3669

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics