Jump to content


Photo

AP 6" Superplanetary on AstroMart

  • Please log in to reply
107 replies to this topic

#76 Napersky

Napersky

    Vanguard

  • *****
  • Posts: 2037
  • Joined: 27 Jan 2010
  • Loc: Chicagoland

Posted 23 January 2013 - 03:19 PM

I haven't measured the tube but there may be trouble with the optics more study is needed.

#77 mustgobigger

mustgobigger

    Fly Me to the Moon

  • *****
  • Posts: 5345
  • Joined: 11 Jun 2007
  • Loc: Michigan

Posted 23 January 2013 - 04:00 PM

sorry to hear that mark,
what about sending it back.
that much money it should have perfect optics.
ebay has buyer protection plan.
you should still be able to return it up to 30 days
no matter what the seller says about returns.
garys a reputable dealer and should give you no problem.
or at least fix it for you.
hope it all works out and keep us posted.

#78 mustgobigger

mustgobigger

    Fly Me to the Moon

  • *****
  • Posts: 5345
  • Joined: 11 Jun 2007
  • Loc: Michigan

Posted 23 January 2013 - 04:01 PM

yes the tube is 7" and ota weighs 26lbs.

#79 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2772
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 23 January 2013 - 04:07 PM

He did measure the OD and it is 6 7/8".

#80 Napersky

Napersky

    Vanguard

  • *****
  • Posts: 2037
  • Joined: 27 Jan 2010
  • Loc: Chicagoland

Posted 23 January 2013 - 04:10 PM

Star Test of Sirius shows diffraction spikes. This should not be. Should have been able to go higher power and see detail on Jupiter was very disappointed.

#81 Napersky

Napersky

    Vanguard

  • *****
  • Posts: 2037
  • Joined: 27 Jan 2010
  • Loc: Chicagoland

Posted 23 January 2013 - 04:12 PM

30 day is no ones "return period" for mail order transactions its Federal Law!

#82 Napersky

Napersky

    Vanguard

  • *****
  • Posts: 2037
  • Joined: 27 Jan 2010
  • Loc: Chicagoland

Posted 23 January 2013 - 04:15 PM

I need to get a ronchi tester built.
I have a good bench for testing will actually need to extend it for this scope.

The Zygo is a nightmare.

Mark

#83 Napersky

Napersky

    Vanguard

  • *****
  • Posts: 2037
  • Joined: 27 Jan 2010
  • Loc: Chicagoland

Posted 23 January 2013 - 04:17 PM

I hope the NASA glass is not damaged and that no refiguring needs to be done as there is no glass to satisfactory replace it.

#84 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2772
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 23 January 2013 - 04:21 PM

I tested it and I found it has a bad edge. About the last 1/10 inch or so so a mask can make a big difference.

#85 mustgobigger

mustgobigger

    Fly Me to the Moon

  • *****
  • Posts: 5345
  • Joined: 11 Jun 2007
  • Loc: Michigan

Posted 23 January 2013 - 04:33 PM

ebays buyer protection lasts for 30 days and if item was not as described you can file a case and return it.
unless you bought it other than paypal or one of their
approved payment plans.

#86 jjbird

jjbird

    Mariner 2

  • *****
  • Posts: 217
  • Joined: 17 Jan 2006
  • Loc: Wisconsin

Posted 23 January 2013 - 05:26 PM

Is the bad edge a manufacturing issue, or did it become an "acquired" defect? Who ultimately answers for it? These are tough questions to answer.

#87 jjbird

jjbird

    Mariner 2

  • *****
  • Posts: 217
  • Joined: 17 Jan 2006
  • Loc: Wisconsin

Posted 23 January 2013 - 05:29 PM

I wonder if Roland may want to have a chance to refigure it.

#88 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2772
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 23 January 2013 - 06:16 PM

I have wondered if it might be caused by a tight retaining ring or something simple but we have yet to look further into it. I consider this unlikely as I think there would be a pinching effect rather than a bad edge which appeared to around the entire circumference but again it needs to be further looked into.

#89 R Botero

R Botero

    Apollo

  • -----
  • Posts: 1220
  • Joined: 02 Jan 2009
  • Loc: Kent, England

Posted 23 January 2013 - 06:16 PM

I wonder if Roland may want to have a chance to refigure it.


+1

Get in touch with AP - ASAP! Sorry to hear about this - hopefully it can be solved by AP or amicably with the seller... :(

#90 mgwhittle

mgwhittle

    Apollo

  • *****
  • Posts: 1344
  • Joined: 24 Aug 2011
  • Loc: Chattanooga, TN

Posted 23 January 2013 - 07:42 PM

30 day is no ones "return period" for mail order transactions its Federal Law!


Really? Never heard of this before and my google search of the subject does not have provided any info on this. Where are you getting this info from? I'd love this to be true!

#91 Jeff B

Jeff B

    Surveyor 1

  • *****
  • Posts: 1960
  • Joined: 30 Dec 2006

Posted 24 January 2013 - 02:12 PM

Star Test of Sirius shows diffraction spikes. This should not be. Should have been able to go higher power and see detail on Jupiter was very disappointed.


Sorry to hear about the weird star test. Diffraction spikes suggest to me stress on the glass. If so, it can come from several sources.

For example, I had an older 5" oil spaced AP lens that also displayed diffraction spikes, the cause of which were the screws used to secure the cell in the tube. They were very tight and applied enough pressure to the cell to stress the glass. Loosening the screws fixed everything. Extreme cold can also shrink the cell & tube to the point of pinching. Also, Roland sometimes used a gel rather than oil. As the gel ages, it too can apply stress to the lens block.

The former 2 you can check out yourself, the latter will require a return to AP. It may take a few months to get it back too as Roland works service returns in as time permits. Also, there will be a service charge ( I paid $300 for another lens return that displayed a hexagonal diffraction pattern). However, you'll get back a basically new lens, fully serviced and tested.

Jeff

#92 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2772
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 24 January 2013 - 02:24 PM

I don't think diffration spikes is the best way to describe the aberration we saw. It was more like a very "hairy" outer ring. It is caused from a turned edge.

#93 chboss

chboss

    Viking 1

  • -----
  • Posts: 707
  • Joined: 24 Mar 2008
  • Loc: Zurich Switzerland

Posted 25 January 2013 - 02:33 AM

Sorry to hear about the problems with the optics.
It will be interesting to find out what is causing this problem.

best regards
Chris

#94 TG

TG

    Apollo

  • -----
  • Moderators
  • Posts: 1265
  • Joined: 02 Nov 2006
  • Loc: Latitude 47

Posted 25 January 2013 - 11:44 AM

I don't think diffration spikes is the best way to describe the aberration we saw. It was more like a very "hairy" outer ring. It is caused from a turned edge.


Did you test with a very narrow-band green filter? The early A-Ps are not perfectly color corrected and the star test can be muddied by CA.

Also, IIRC, "hairy" outer ring is a sign of rough optics. Turned edge gives you clear rings on on side of focus and fuzzy ones on the other. Here's Suiter's link for reference:

http://home.digitale.../TM/kestner.jpg

As I doubt Roland ever produced rough optics, you may want to check the lens for oil leakage and separation. A separation around the edge could be producing what you're seeing.

Tanveer.

#95 Darren Drake

Darren Drake

    Mercury-Atlas

  • *****
  • Posts: 2772
  • Joined: 09 Oct 2002
  • Loc: Chicagoland

Posted 25 January 2013 - 12:29 PM

No the "hairy" part was moving due to seeing issues and not part of the lens. No filter was used but the bad edge was glaringly obvious in the null test but like I said much more is needed before anything final is determined. Mark is getting heart surgery today and will be outa commision a few weeks.

#96 jjbird

jjbird

    Mariner 2

  • *****
  • Posts: 217
  • Joined: 17 Jan 2006
  • Loc: Wisconsin

Posted 25 January 2013 - 01:13 PM

Best wishes for a quick recovery to Mark.

#97 mustgobigger

mustgobigger

    Fly Me to the Moon

  • *****
  • Posts: 5345
  • Joined: 11 Jun 2007
  • Loc: Michigan

Posted 25 January 2013 - 07:03 PM

Get well mark and keep us all
Posted on your recovery.

#98 Jeff B

Jeff B

    Surveyor 1

  • *****
  • Posts: 1960
  • Joined: 30 Dec 2006

Posted 25 January 2013 - 11:06 PM

God speed Mark. All the best.

Jeff

#99 mikey cee

mikey cee

    Cosmos

  • *****
  • Posts: 7990
  • Joined: 18 Jan 2007
  • Loc: bellevue ne.

Posted 25 January 2013 - 11:31 PM

Darren obviously we didn't see this one coming. But tell Mark that Mike and Donna from Omaha wish him a good prognosis and strong recovery. He owes me a look in his Unitron and hopefully that Super Planetary when the bugs are worked out. :p ;) Mike

#100 Erik Bakker

Erik Bakker

    Gemini

  • *****
  • Posts: 3139
  • Joined: 10 Aug 2006
  • Loc: The Netherlands, Europe

Posted 26 January 2013 - 08:04 AM

Me at the device


Get well soon Mark! :fingerscrossed: :flower:

Love to see you back at the device with you both in proper order :waytogo:






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics