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Equipment Discussions >> Refractors

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telescopemullet
professor emeritus
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Reged: 11/16/09

Istar apo
      #5971518 - 07/15/13 12:34 AM

Purchased a forfax apo yesterday from Mike at the SCAE: This is one incredible scope. Photos and details to follow. First night was an eye opener.

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mikey cee
Postmaster
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Reged: 01/18/07

Loc: bellevue ne.
Re: Istar apo new [Re: telescopemullet]
      #5972060 - 07/15/13 11:29 AM

Mullet you obviously didn't hear a word the critics have said. That scope can't be any good. Mike

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Kunama
professor emeritus


Reged: 10/22/12

Re: Istar apo new [Re: mikey cee]
      #5972922 - 07/15/13 06:57 PM

Quote:

Mullet you obviously didn't hear a word the critics have said. That scope can't be any good. Mike




??????

Looking forward to seeing the pictures and report on this one.


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NHRob
Post Laureate
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Reged: 08/27/04

Loc: New Hampshire
Re: Istar apo new [Re: Kunama]
      #5972988 - 07/15/13 07:37 PM

need 1st light report!!

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Kunama
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Reged: 10/22/12

Re: Istar apo new [Re: telescopemullet]
      #5973028 - 07/15/13 08:01 PM

Pics ...... where are the pictures !

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telescopemullet
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Reged: 11/16/09

Re: Istar apo new [Re: Kunama]
      #5973317 - 07/15/13 11:16 PM

Scope is acclimating now, this is a brand new 140 forfax.

This is a very well built scope, solid. Focused is an IStar as well, no complainants there, not a FT but still good. Report to come tomorrow.


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jrbarnett
Eyepiece Hooligan
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Reged: 02/28/06

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Re: Istar apo new [Re: telescopemullet]
      #5973345 - 07/15/13 11:47 PM

What are the specs on the scope (doublet or triplet? glass types used? focal ratio? etc.). Also are there any spot diagrams for the optic? I didn't see a "Forfax" listed on the Istar website. Is it maybe a discontinued or a newly introduced model? 140mm is a nice portable, but still large (for a refractor) aperture.

- Jim

Edited by jrbarnett (07/15/13 11:52 PM)


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telescopemullet
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Reged: 11/16/09

Re: Istar apo new [Re: jrbarnett]
      #5973431 - 07/16/13 12:47 AM

Moon...there was a very slight yellow tint on the edge of the limb when using celestron eyepieces, the pre luminos versions, i forget their names. When switched to televue naglers, absolutely color free views, a very bright moon against a very dark background. Color free down to 9mm which is where I stopped on the magnification. Shadows were very dark and crisp. I did not press the issue with my planetary eyepieces as the atmosphere is still not allowing more magnification.

This scope is easily handled by the g11, vibrations well less than 1 second, focusing manually not an issue.

The triplet is very heavy, but again, g11 is taking this scope in stride.


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Kunama
professor emeritus


Reged: 10/22/12

Re: Istar apo new [Re: jrbarnett]
      #5973440 - 07/16/13 12:53 AM

Quote:

What are the specs on the scope (doublet or triplet? glass types used? focal ratio? etc.). Also are there any spot diagrams for the optic? I didn't see a "Forfax" listed on the Istar website. Is it maybe a discontinued or a newly introduced model? 140mm is a nice portable, but still large (for a refractor) aperture.

- Jim




Istar used to do a 140mm F12 (LTT140 ?) I think there was a review on CN last year, I assume this is the same scope.
Very long at 1680mm FL so would have quite a moment arm and need a solid mount.
There was one on Astromart for $2500 last year from memory.
Good luck with your new scope Mullet.

Number of Elements: 3
Type: Super Apochromatic Triplet
Lens Coating: Full Multi-Coated
Clear Aperture: 140 mm (5.5 inches)
Lens Diameter: 144 mm
Focal Ratio: f/12
Focal Length: 1680mm
OTA Weight: 13.9 kg - 30.6 lbs. (including focuser reduction and cap)

Edited by Kunama (07/16/13 01:23 AM)


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telescopemullet
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Reged: 11/16/09

Re: Istar apo new [Re: Kunama]
      #5973453 - 07/16/13 01:09 AM

That is the model I purchased. Moment arm is not that big of a deal, but then I have been using my 150 f15 for a while now and this apo is much shorter.

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timps
sage


Reged: 02/24/13

Re: Istar apo new [Re: telescopemullet]
      #5973575 - 07/16/13 05:16 AM

I contacted Istar earlier this year, enquiring about their
Apo's. They told me Istar no longer make Apo's.


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SteveG
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Reged: 09/27/06

Loc: Seattle, WA
Re: Istar apo new [Re: timps]
      #5974782 - 07/16/13 06:34 PM

Here's a thread from last year regarding the Forfax:
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5680526/Main...


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telescopemullet
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Reged: 11/16/09

Re: Istar apo new [Re: SteveG]
      #5975870 - 07/17/13 12:17 PM

I have been observing Saturn last two nights and comparing the view with my CPC1100. The atmosphere has been pretty sloppy here so I was only able to get down to my 7.5 Tak LE on the APO. Tried to employ a 5mm Mono but it was too much. Saturn is crisp and no false color at all. Colors seen on planet are exact as seen in the CPC 1100, details are plainly evident and comparable to the CPC being that the CPC does not take magnification as well as the refactor.

Going to get some deep sky next.


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mgwhittle
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Reged: 08/24/11

Loc: Chattanooga, TN
Re: Istar apo new [Re: telescopemullet]
      #5976139 - 07/17/13 02:37 PM

When you say the CPC doesn't take magnification as well as your new Istar, what exactly do you mean?

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telescopemullet
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Reged: 11/16/09

Re: Istar apo new [Re: mgwhittle]
      #5976215 - 07/17/13 03:35 PM

My CPC cannot handle very high magnifications, especially under poor skies: Last night I could not get past a 22mm eyepiece in the CPC while the refactor took down to a 7.5mm. Make sense?

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Tapio
Pooh-Bah


Reged: 09/24/06

Loc: Tampere, Finland
Re: Istar apo new [Re: telescopemullet]
      #5976254 - 07/17/13 03:56 PM

Something is not right with that CPC.

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telescopemullet
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Reged: 11/16/09

Re: Istar apo new [Re: Tapio]
      #5976266 - 07/17/13 04:02 PM

It works just fine, I can typically use down to a 12mm but that takes good skies...this is on planets mind you...

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Gord
Carpal Tunnel
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Reged: 01/06/04

Loc: Toronto, ON, Canada
Re: Istar apo new [Re: telescopemullet]
      #5976283 - 07/17/13 04:09 PM

Quote:

Colors seen on planet are exact as seen in the CPC 1100, details are plainly evident and comparable to the CPC being that the CPC does not take magnification as well as the refactor.




And more specifically, this IStar apo is only performing the same as a poor performing C11? 127x (22mm) in a C11 is loafing along. Is the collimation out?

Clear skies,


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telescopemullet
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Reged: 11/16/09

Re: Istar apo new [Re: Gord]
      #5976293 - 07/17/13 04:13 PM

The views are comparable because I could not push the magnification on the CPC, the image was blowing out given the atmosphere and the cool down factor of the scope being in my observatory all day. I was steering clear of stating that a small APO was providing more detail that an 11-inch refactor, the views were comparable given the magnification level with the CPC.

Edited by KWB (07/18/13 10:15 PM)


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fred1871
professor emeritus


Reged: 03/22/09

Loc: Australia
Re: Istar apo [Re: telescopemullet]
      #5976729 - 07/17/13 08:06 PM

Mullet, you appear to have a problem with your CPC1100 if the 22mm eyepiece (127x) is the limit sometimes, and 12mm (233x) is your planetary limit. I have a C9.25 and it does better than that; in the past I had regular access to a C14, and it was loafing at 120x (the C9.25 isn't pushed at that level either). Around 240x on either of them, including for planets, is no big deal.

On the C11 a power of 233x is a 1.2mm exit pupil. That should not be the limit for planets if the seeing is even half-way reasonable.

So comparing what seems to be a C11 with problems with any other telescope is not informative, because that C11 appears to have problems and isn't performing at a normal level for a C11.



Edited by KWB (07/18/13 10:19 PM)


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