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Equipment Discussions >> Refractors

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Napersky
Carpal Tunnel
*****

Reged: 01/27/10

Loc: Chicagoland
AP 6" Superplanetary on AstroMart
      #5585289 - 12/23/12 09:51 AM

This is the best amateur refractor I have looked thru. Now what that does is exclude all large refractors over 6" since 6" is the largest I have been able to use.

Nothwithstanding the aperture limitation this scope presented outstanding views of the disc of Neptune with some detail. I have not seen any reflector, SCT including our Chicago Astronomical Society's 14 MEADE LX200 on a Paramount ME produce views anywhere close to this wonderful scope.

It's long focal length f12 truly makes it a SUPER PLANETARY INTRUSMENT.

Mark

I am not the seller and wish I could buy it!

http://www.ebay.com/itm/Astrophysics-6-f12-Superplanetary-refractor-Losmandy-...


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The Ardent
Pooh-Bah
*****

Reged: 10/24/08

Loc: Virginia
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5585526 - 12/23/12 12:33 PM

Your title says Astromart but the link is *bay



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Jim7728
Postmaster
*****

Reged: 04/10/05

Loc: Stoop Landing Observatory, NYC
Re: AP 6" Superplanetary on AstroMart new [Re: The Ardent]
      #5585534 - 12/23/12 12:42 PM

Apparently, there are two for sale. Different sellers.

http://www.astromart.com/classifieds/details.asp?classified_id=804516


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Cotts
Just Wondering
*****

Reged: 10/10/05

Loc: Toronto, Ontario
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5585712 - 12/23/12 02:27 PM

The eBay scope is on sale from Hands On Optics so a reputable dealer is involved.... Gary probably had it out for a spin so he could vouch for it....

I wonder how different this scope would be from my Astro-Physics 1988 6" f/8 triplet in terms of colour correction and overall optical quality.....

Dave


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ryderc1
sage
*****

Reged: 04/15/06

Re: AP 6" Superplanetary on AstroMart new [Re: Cotts]
      #5585746 - 12/23/12 02:47 PM

I owned a 5" f/12 Superplanetary which, presumably, would have slighly less color than a 6" f/12 Superplanetary. Nevertheless, I found it to be less well color corrected than an FS-128 (but considerably better corrected than a 5" f/15 D&G achro as would be expected).

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Mirzam
Post Laureate
*****

Reged: 04/01/08

Loc: Lovettsville, VA
Re: AP 6" Superplanetary on AstroMart new [Re: ryderc1]
      #5586027 - 12/23/12 05:50 PM

These two AP scopes hold a special interest for me. I placed an order for one in 1985. Then kid #1 was born and our family moved to a new house. Had to cancel the order. AP refunded my deposit no questions asked. The most amazing thing was when I placed another order 20 years later they still had my information in their data base! In a world with so much shoddy customer service and shoddy behavior in general, it's nice to deal with a company that has integrity. Hard to place a price on that.

JimC


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Pete-LH
sage
*****

Reged: 03/25/09

Loc: Wilmington, DE
Re: AP 6" Superplanetary on AstroMart new [Re: Mirzam]
      #5586616 - 12/24/12 03:06 AM

I have the 5" AP superplanetary. I think the colour correction in focus is comparable if not equal to my FS-102. I was tempted for the 6" AP SP and also the D&G 6" f12 recently posted but had decided 5" f/12 was my limit for storage, lifting, mounting and transporting.

The views are fabulous.


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Sunspot
Postmaster
*****

Reged: 03/15/05

Loc: Surprise, AZ
Re: AP 6" Superplanetary on AstroMart new [Re: Cotts]
      #5586867 - 12/24/12 09:32 AM

I saw this scope in Tucson...was VERY tempted to buy it. It looked a bit rough, but the optics looked very clean.

Quote:

The eBay scope is on sale from Hands On Optics so a reputable dealer is involved.... Gary probably had it out for a spin so he could vouch for it....

I wonder how different this scope would be from my Astro-Physics 1988 6" f/8 triplet in terms of colour correction and overall optical quality.....

Dave




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gillmj24
Post Laureate
*****

Reged: 12/06/05

Loc: PA
Re: AP 6" Superplanetary on AstroMart new [Re: Sunspot]
      #5587582 - 12/24/12 06:08 PM

Guess the Astromart seller wont get 7k now...

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Napersky
Carpal Tunnel
*****

Reged: 01/27/10

Loc: Chicagoland
Re: AP 6" Superplanetary on AstroMart new [Re: gillmj24]
      #5587732 - 12/24/12 08:46 PM



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Napersky
Carpal Tunnel
*****

Reged: 01/27/10

Loc: Chicagoland
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5587735 - 12/24/12 08:50 PM

Dave the longer the focal length the better and easier to color correct.

The magic of the APOs is short focal length color correction. Even long focal ratio achromats are well corrected, I have many achromats good ones very little if any false color.

The best way of course to determine the quality of color correction is multi-color interferometry in the way Wolfgang Rohr does.

Mark


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Denimsky
professor emeritus


Reged: 01/21/07

Loc: BC, Canada
Re: AP 6" Superplanetary on AstroMart new [Re: gillmj24]
      #5587777 - 12/24/12 09:38 PM

I'm not sure how much AP800 mount is worth but the AstroMart one includes an AP 800 mount.

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Eddgie
Postmaster
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Reged: 02/01/06

Re: AP 6" Superplanetary on AstroMart new [Re: Cotts]
      #5587821 - 12/24/12 10:17 PM

The 6" f/8 would I think fail even Roland Christen's definition of "APO today, though at the time it was sold, it was considered an APO (1/8000th of the focal lenght spacing).

Anyway, the 6" f/8 is not color free. The only ray trace for a similar design I have is for an 8" f/10 Christen Immersion Triplet. In this design, the red, green, and blue are well corrected, but the violet spread is very defocused (about 30mm at the focal plane). This is so diffuse that it would be difficult to see unless the star is very bright (Sirius or Vega). This is consistent with the 6" f/8. The violet is defocused over a very wide area and unless the star is very bright, you can't see it.

I am sure the correction is not as good as the Superplanetary, but it is excellent in red, green, and blue. When cooled, stars appear to be color free, but again, bright stars will show a very faint but very large diffuse violet in the field. Barely detectable even on the brightest stars.


Optical quality though I would think could not be better than in the 6" f/8. I think Mr. Christen is perhaps a compulsive type incapable of letting something go out the door that is not made to standards that border on absolute perfection.

My 6" f/8 has the best optical of any telescope I have ever star tested. Flawless. Perfect breakout on the SA test, and optics that are as smooth as I have ever seen. I don't know for the life of my how the Superplanetary could be better than this because it is optically about as perfect as one could ask for. There is no meaningful improvement to be found beyound this level of quality. It would be a meaningless decimal place change on the Strehl report.

Edited by Eddgie (12/24/12 10:21 PM)


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Napersky
Carpal Tunnel
*****

Reged: 01/27/10

Loc: Chicagoland
Re: AP 6" Superplanetary on AstroMart new [Re: Eddgie]
      #5587841 - 12/24/12 10:34 PM

Paul,

How much was Hands On Optics asking for the same scope that you saw in Tucson? Was it the same as the one they sold on
Ebay with the g11 mount?

Msrk


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gillmj24
Post Laureate
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Reged: 12/06/05

Loc: PA
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5588185 - 12/25/12 08:18 AM

The last one on astromart tube only, sold for only 3500 IIRC. That corresponds well to 5k with a G11. A unitron guidescope and ap800 aren't worth $4000 (he is asking 7500 not 7000 my mistake) but good luck to the seller. If someone with deep pockets missed the ebay auction and decides suddenly he has to have a superplanetary (they don't come up.for sale all that often) it might sell for that. You can check feedback and see if he is flipping the 3500 dollar OTA for a Christmas bonus.

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Napersky
Carpal Tunnel
*****

Reged: 01/27/10

Loc: Chicagoland
Re: AP 6" Superplanetary on AstroMart new [Re: gillmj24]
      #5588209 - 12/25/12 08:57 AM

$4,500 for a pristine OTA and $3,000 for the AP Mount, it could happen. Otherwise he would have not much trouble getting prices close to those if he later sells them separately.

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Napersky
Carpal Tunnel
*****

Reged: 01/27/10

Loc: Chicagoland
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5588430 - 12/25/12 12:42 PM

Hands On wanted $6,500. Which could translation into $5,000 for the scope and $1,500 for the G11 mount and tripod.

This means the one on Amart would be asking $5,500 for their better condition scope and $2,000 for the AP 800 mount. A fair price.

Mark


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Napersky
Carpal Tunnel
*****

Reged: 01/27/10

Loc: Chicagoland
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5589452 - 12/26/12 10:39 AM

Won it!

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t.r.
Post Laureate
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Reged: 02/14/08

Loc: Upstate NY
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5589734 - 12/26/12 01:14 PM

Congrats! Pics when you get it of course!

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The Ardent
Pooh-Bah
*****

Reged: 10/24/08

Loc: Virginia
Re: AP 6" Superplanetary on AstroMart new [Re: Napersky]
      #5589889 - 12/26/12 03:34 PM

The one on *bay or Astromart?

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