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Post by jamesling1000 on Jan 28, 2013 1:07:03 GMT -5
Hi Ales..... Is a month since your last update on the raycorr development status..... Is it possible for you to give us your monthly update on the progress of this raycorr , since January is almost coming to an end , and we are fast approaching Feburary, and very soon , we will be in 1st qtr ending.....  I am sure many others , are like me more anxious to know the current status of this product..... Regards James Ling |
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Post by delorme on Mar 5, 2013 22:58:02 GMT -5
Hi Alex, Please give us an update, good or bad on the Raycorr. We realize that this is difficult. Just let us know what's up. Look forward to the day I can buy your 8" lens. Looking forward to your reply. De Lorme
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Post by aviegas on Jun 2, 2013 10:48:54 GMT -5
Just wondering if there is any update on the Raycorr? Also I was curious if anyone has used the old Chromacor correctors with their scopes and if this had any noticeable impact? There is a Chromacor N up for auction at Astromart, so was just wondering about the pros/cons of going chromacor vs. waiting for the raycorr.
Thanks
Al
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gord
Full Member
Posts: 82
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Post by gord on Jun 2, 2013 21:01:47 GMT -5
Al,
The Chromacor's work, and work well within their design parameters. That doesn't mean they aren't without limitations. They need to be matched properly to the objective, they need to be adjusted for spacing correctly, and they deliver the correction within the center of the FOV.
If you get all that right, then things become very ED to apochromat like. All depends on the model and the objective size/FL you are dealing with.
One additional important thing to remember is the spherical aberration correction that is going on as well. They correct for more than just CA, so that's why they need to be matched to the objective. I used an incorrectly matched one on my 6" F10 and the CA was dramatically improved. However, details didn't seem that much better.
Switching to the properly matched one (Chromacor-II U1), CA was gone and the detail improvement was dramatic. Different scope completely. Effectively an apo.
The main pro to the Chromacor right now is they exist and work! But they aren't easy to find and it has to work for your scope.
The other thing to remember is that they are made for a normal CF corrected scope. With the R30's, IStar has gone a different direction with the color correction, so this will not be an ideal setup. I expect it will overcorrect the blue.
It's also kind of a problem with the Raycorr's, if they are going to be tailored to the R-series. If they are, it will mean they will not be a good match for the classic achros. I think there was talk of making multiple versions, but with more versions comes more trouble to produce and so more risk of things not working (or not working well).
Digging into the history of CA correctors, there have only really been two. Roland's tri-space and Valery's Chromacor. Roland only ever made 2, and Valery is the only one to do it in serial production. It's my understanding that at least 3 companies have attempted this since the Chromacor came out, Meade being the largest, and all have failed. Chromatic correction is obviously not easy!
Clear skies,
-Gord
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Post by aviegas on Jun 2, 2013 21:14:54 GMT -5
Thanks for the heads up! I was toying with the idea, but I,will just wait it out for the Raycorr... I am sure Ales knows that if he gets it right the Raycorr could be a great seller, but I appreciate your realistic warnings about just how hard it is to fabricate.
Al
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Post by evanapp on Jun 3, 2013 13:07:11 GMT -5
As a newcomer to this forum, I've been following this thread with some interest. I was wondering if anyone has every published details of the physics and/or engineering principles that underlie the concept of these correctors. At first blush, the whole idea seems like a contradiction in terms -- making an apochromat without making an apochromat. And the fact that Meade gave up on the idea is less than encouraging!
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Post by laurence on Jun 3, 2013 14:16:20 GMT -5
Hi I had a cromacor matched to a sky watcher 150mm F8 and wish I never sold it. I have since used a few 130mm to 150mm APO,S and there is little improvement with the true APO,S so I will want a 180mm F8 R30 with a matched Raycorr as I have seen how good these can be when correctly matched. I hope this gives some faith to people awaiting the Raycorr.
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Post by evanapp on Jun 3, 2013 16:41:52 GMT -5
"Hope springs eternal in the human breast;
Man never Is, but always To be blest."
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Post by bn1777 on Jun 6, 2013 5:39:43 GMT -5
Hi I had a cromacor matched to a sky watcher 150mm F8 and wish I never sold it. I have since used a few 130mm to 150mm APO,S and there is little improvement with the true APO,S so I will want a 180mm F8 R30 with a matched Raycorr as I have seen how good these can be when correctly matched. I hope this gives some faith to people awaiting the Raycorr. Hi Laurance , I have a Saxon ( Synta) 150mm f/8 with a fitted Chromocorr in NZ while I am here in Australia working and I hear what you are saying . I was tempted to sell this scope before I moved here but I could not bring myself to do that as its performance was really , really good , not far behind a friends AP 152mm f8 Star fire up to about 350x and at 1 1/10th the cost I don't think its worth it for me to sell as , what else would I get at that price ?? My Nephew is using my Saxon (synta) 150mm and loving her and looking after her well , I am happy with that . I have built an Istar 127mm f8 achro since I have been here and its performance is very good . I am thinking a R30 127mm f8 as the price is excellent just to compare the achro and R30 ?? . I will keep all who are interested as to how this pan's out . I had a head to head here last Saturday night with a mates nice 150mm f8 SW and the Istar gave way better views on all objects , Saturn at 317x ( 3mm TV Radian ) there was no comparisim , the Istar was way better , the only area the 150mm SW won out in was deep sky , 25mm is a lot at this size . I will do a full report of this shootout with photos soon . Chromocors do work when set up correctly and I hope the Istar Raycors live up to their promise. Brian. Attachments:
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Post by Mike on Jun 24, 2013 15:56:15 GMT -5
A good design exists. That part is finished and has been for some time. If the first glass company would have provided the correct glass in the first place, there would be no posts on the subject. Poor Ales after completely finishing a prototype only to find out the company mislabeled - misrepresented the glass (it's your call). This is what started the whole thing getting off track. Ales was so frustrated with the whole thing he put it on the back burner for a while. Getting the correct glass has been an exercise in futility. However, we finally struck a deal with Ohara for the correct glass after much much trouble. Now we have everything we need to again assemble prototypes. Ales will be back from the US at the end of this month. Hopefully then everything will be back on track. We're trying... I guess if we had hundreds of thousands of dollars at our disposal this would not take so long. Sales are not bad but they could be better if we could just stop all the bad publicity on CN. Sorry, but I'm being truthful here. I'm just as tired of the setbacks as you guys. I think Ales thought this thing would be here because the design looked good and the prototype was built. So we have been eating a lot of insults. Somebody on CN called the Raycorr a carrot. I guess that means teaser. As soon as I hear something positive from Ales I'll report it here. By positive I mean finished prototype, tested, works and able to be duplicated  |
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Post by mikey cee on Jun 24, 2013 17:34:34 GMT -5
I'd rather be in my shoes than yours any day Mike. I live a life of little preassure day to day. So far it's because I made good choices along life's way....some by luck but a lot by priortized planning. Anything worth a damn seems like it takes forever with all kinds of obstacles in the way. Hell if it were easy we'd have built or bought our own "Raycorrs" by now. Gives Ales my best regards. Thanks Mike  |
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