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

Announcements and News >> Discussion of CN Articles, Reviews, and Reports

Pages: 1
Charlie HeinAdministrator
Postmaster
*****

Reged: 11/02/03

Loc: 26.06.08N, +80.23.08W
TS 120mm 900MM FL ED Doublet
      #6005000 - 08/03/13 03:23 PM

TS 120mm 900MM FL ED Doublet Apochromatic Refractor

By Steven P. Sukel


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

Reged: 02/28/06

Loc: Petaluma, CA
Re: TS 120mm 900MM FL ED Doublet new [Re: Charlie Hein]
      #6005129 - 08/03/13 04:50 PM

Well done, practical and comprehensive review of a really, really nice looking, tempting scope!

Thanks for the well-written, informative review.

- Jim


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

Reged: 02/26/06

Loc: Atlanta, GA
Re: TS 120mm 900MM FL ED Doublet new [Re: jrbarnett]
      #6005562 - 08/03/13 10:56 PM

Thanks for the informative review. I really want a scope like that now!

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

Reged: 11/20/08

Loc: Flushing, NY - Europe
Re: TS 120mm 900MM FL ED Doublet new [Re: wprince]
      #6005663 - 08/04/13 12:36 AM

Excellent review!

Certain changes need to be made in the Mag. Table because a 6mm eyepiece gives 150X, a 5mm is 180X, a 4mm is 225X, and a 3mm is 300X.

George


Post Extras: Print Post   Remind Me!   Notify Moderator  
spsesq
super member
*****

Reged: 06/04/11

Loc: New Jersey, USA
Re: TS 120mm 900MM FL ED Doublet new [Re: george tatsis]
      #6005996 - 08/04/13 10:16 AM

Thanks for the input. I am not the author of the table. It's a plug in the value and it spits out based on aperture and focal length. The actual review has the correct magnifications for the eyepieces used in the observations. Thanks again for the input.

Post Extras: Print Post   Remind Me!   Notify Moderator  
spsesq
super member
*****

Reged: 06/04/11

Loc: New Jersey, USA
Re: TS 120mm 900MM FL ED Doublet new [Re: spsesq]
      #6006136 - 08/04/13 01:40 PM

Corrected below

Edited by spsesq (08/04/13 01:55 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
spsesq
super member
*****

Reged: 06/04/11

Loc: New Jersey, USA
Re: TS 120mm 900MM FL ED Doublet new [Re: spsesq]
      #6006143 - 08/04/13 01:44 PM

I went back to the table and I believe based on entering other scope specs they are rounded figures. For example the highest practical magnification for the 120 mm scope is 282x. The closest eyepiece to get you there is a 3mm. Hence, the tables format. The magnifications are not exact but rather what eyepiece to use to get to the theoretical limits.
Steve

Edited by spsesq (08/04/13 01:47 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Gert K A
sage


Reged: 07/16/12

Loc: Copenhagen, Denmark
Re: TS 120mm 900MM FL ED Doublet new [Re: spsesq]
      #6015168 - 08/09/13 06:23 AM

Love it!.. Congratulations. It is a very tempting scope indeed.
Thanks for taking the time to share


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


Reged: 08/19/07

Loc: The Netherlands
Re: TS 120mm 900MM FL ED Doublet new [Re: Gert K A]
      #6015176 - 08/09/13 06:35 AM

Hi Steven: you wrote a very nice review!

Post Extras: Print Post   Remind Me!   Notify Moderator  
dvb
different Syndrome.
*****

Reged: 06/18/05

Loc: Vancouver, Canada
Re: TS 120mm 900MM FL ED Doublet new [Re: Traveler]
      #6016222 - 08/09/13 04:58 PM

Thanks very much for the well-written review. I was looking very carefully at this scope, but jumped at a used Skywatcher Black Diamond 120ED f/7.5, which uses the same optics.

Like you, I am delighted by the optics and the aperture - for me, it will get a lot of use when I don't want to set up the 10" Newt.

Being used to the 10" and 8" apertures of Newts, I expected to be disappointed with the views from my light-polluted location (Red at best, probably White). I was not disappointed at all!

On a New Moon night, with great seeing, the Ring/ M57 was beautifully presented - obvious at 37x in with a Panoptic 24, and it just got better at 100x with a Nagler T6 9mm, a Delos 6mm, and a Nagler T6 5mm.

The Double/ Double (Epsilon Lyra) was beautifully split at 100x.

I'll look forward to your future reports - 120mm f/7.5 is a sweet spot for refractors - bigger is too much scope for me to handle (I had a 6" achro) less does give me the light grab I like (I had a 100ED).


Post Extras: Print Post   Remind Me!   Notify Moderator  
spsesq
super member
*****

Reged: 06/04/11

Loc: New Jersey, USA
Re: TS 120mm 900MM FL ED Doublet new [Re: dvb]
      #6021606 - 08/12/13 08:41 PM

Thank you for all your comments. I am glad the review helped out.
Steve


Post Extras: Print Post   Remind Me!   Notify Moderator  
Maverick199
Postmaster
*****

Reged: 02/27/11

Loc: India
Re: TS 120mm 900MM FL ED Doublet new [Re: spsesq]
      #6037827 - 08/21/13 07:42 AM

Nice review and Jim's advice seemed to have clinched it.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Teo79
newbie


Reged: 12/31/13

Re: TS 120mm 900MM FL ED Doublet new [Re: Maverick199]
      #6283338 - 12/31/13 12:04 PM

Hello Gents!
I'm Matteo, from Italy, and I need some help!
I'm desperately serching for a 120 ed refractor that could reach the focus with a baader maxbright binoview, without a focal multiplier!
I hope that this nice refractor can do that, but I need to know its exactly backfocus. Do someone of you have this instrument? How can I contact with Steven Sukel?


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

Reged: 09/27/06

Loc: Seattle, WA
Re: TS 120mm 900MM FL ED Doublet new [Re: Teo79]
      #6291906 - 01/04/14 01:41 PM

Teo, I suggest you move this question to the refractor forum.

I have it's cousin, the WO Megrez 120. When I tried binoviewing, I had the cheaper Orion unit. I found that I could achieve focus without the correcter using a 1.25" diagonal. Hopefully some who has this scope can confirm.


Post Extras: Print Post   Remind Me!   Notify Moderator  
amicus sidera
Post Laureate
*****

Reged: 10/14/11

Loc: East of the Sun, West of the M...
Re: TS 120mm 900MM FL ED Doublet new [Re: SteveG]
      #6293761 - 01/05/14 12:08 PM

I'm in the market for a a 120mm-140mm apochromatic refractor, and at first glance this model looked inviting; however, while I'm sure that the views through this instrument are first-class, what I primarily took away from this review was that:

1. The interior of the focuser adapter was machined to tolerances that did not ensure compatability with one of the world's most popular 2" diagonals;

2. Dust particles that should never have been present within the tube at final assembly ended up on the objective during transit, necessitating partial disassembly of the instrument by the customer to rectify the situation;

3. No provision was made for affixing a finder scope and rings, apart from mounting them at a less-than-desirable position on the mounting rings, far from the eyepiece;

4. The objective is made in part from "secret" glass, if I'm reading the review correctly. This would seem to imply that no data or specifications are available for the material, especially as regards any potential hygroscopic tendencies or other physical aspects of the element.

I do not find the above issues acceptable in a plus-$2000.00 instrument.



Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
0 registered and 6 anonymous users are browsing this forum.

Moderator:  droid 

Print Thread

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


Thread views: 2443

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics