AP 6" Superplanetary on AstroMart
Posted 23 January 2013 - 03:19 PM
Posted 23 January 2013 - 04:00 PM
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.
Posted 23 January 2013 - 04:10 PM
Posted 23 January 2013 - 04:12 PM
Posted 23 January 2013 - 04:15 PM
I have a good bench for testing will actually need to extend it for this scope.
The Zygo is a nightmare.
Posted 23 January 2013 - 04:17 PM
Posted 23 January 2013 - 04:21 PM
Posted 23 January 2013 - 04:33 PM
unless you bought it other than paypal or one of their
approved payment plans.
Posted 23 January 2013 - 05:26 PM
Posted 23 January 2013 - 05:29 PM
Posted 23 January 2013 - 06:16 PM
Posted 23 January 2013 - 06:16 PM
I wonder if Roland may want to have a chance to refigure it.
Get in touch with AP - ASAP! Sorry to hear about this - hopefully it can be solved by AP or amicably with the seller...
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!
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.
Posted 24 January 2013 - 02:24 PM
Posted 25 January 2013 - 02:33 AM
It will be interesting to find out what is causing this problem.
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:
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.
Posted 25 January 2013 - 12:29 PM
Posted 25 January 2013 - 11:31 PM
Posted 26 January 2013 - 08:04 AM
Me at the device
Get well soon Mark! :flower:
Love to see you back at the device with you both in proper order