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But you’re problem definitely is the Baader Click lock. Those are used only for visual, not for astrophotography. But if you have any doubts about it with the configuration that you have right now, just do the barrel every time you the optical tube moves from position. But if you any any doubts regarding the Baader Click Lock, just do this: Point the telescope to east and take some images and run into ASTAP or CCD Inspector and check the tilt. Then point the telescope to the west and take and run some images to see if you have any tilt. You’ll find the tilting pouting in the direction of the ground which is caused by the Click Lock. He’s like dancing inside |
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OK. I see what you mean now. There are 48mm female threads on the telescope side of the corrector. I ordered a Celestron visual back that has 42mm male threads and a 42mm female to 48mm male adapter. I'll be able to thread the Starizona Corrector to the scope. Great! Thanks so much for taking the time to help me my friend Observatório Astrográfico do Boqueirão  Mike |
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By aiming the telescope at the floor, loosing the Baader ClickLock then retightening it I was able to get the tilt down to 13%. So it's obvious that the parts I have coming will get me the low tilt percentage I need. All of you that said the ClickLock was the problem, You were right. Thanks Guys |
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Let us know when you have everything operational. Just be carefull not putting the reducer/flatnner to much separated of the back of the telescope. Cesar |
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| The Baader SCT adapter I ordered is a short version. Parts will be here tomorrow afternoon and it's been clear all week so I'll let you know my results. Thanks again. |
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Here's my final solution. I haven't taken any images yet to test the tilt but I wanted to show the final result. Rock solid with the Baader visual back. Got the 90mm back focus as well. Corrector is close to the scope so the reduction should be right. Thanks again Cesar  Mike   |
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Mike H: That way I can tell you, you won’t have tilt in the optical trem. For sure. Just do a collimation using a bright star before you’re starting to shoot. let me know about the results.. I’m super curious and probably I’ll be a future user of that reducer because I discovered today a thing about my Celestron one. Wish the best luck |
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My new connection using all threaded pieces: ??? |
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My new connection using all threaded pieces: ??? I will take a couple of long exposures tonight and see what the stars really look like. I was told that this software is not always dependable. |
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Mike H: Correct! Is not always dependable, but do also a check for the collimation. instead of using the square use the triangle an with the extra stars.. if you do like a 600s exposure, do a couple of them you will see the star field in the corners how they are, but my guess is that they are not too bad and really manageable. the CCD Inspector is far better for check tilt, despite the absurd among of money. But you have a 30 day trial |
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I've got a tri bahtinov mask I'm going to use to check collimation. Then I'll download CCD Inspector. Thanks again Cesar Everything threaded together has to be better. |
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So as a follow up to this post. I followed Cesar's and others advise, did away with the Baader Click Lock and used a Baader piece, visual back, I could thread to. The tilt dropped to 4% which is good enough for me. Stars are looking round pretty much to the very edges. However, autofocus no longer functioned correctly. I could not get a good curve. I have discovered why. There is almost no infocus travel possible. The Starizona corrector is too far away from the C8s optics. The focuser "bottoms out" at a very small amount of turning from focus. So if autofocus tried to turn the knob in that direction, it will hit. The Baader Click Lock allowed the Corrector to slip into it enough that I had some focus travel. Currently working on finding another solution. Which, is not likely. There is nothing in the Starizona literature that talks about this problem. Did the older C8s, orange tubes, have less focus travel? If I use a standard visual back with a compression ring, the Corrector will slide in further giving more travel and autofocus works. However, the tilt comes back when the imaging train is not threaded to the scope  Starizona has their own visual back "Virtual View" but it's a compression ring piece as well. I know, I know, shut up and buy an Edge HD already. Mike  |
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I just went through this very process on my fairly recent C8-A XLT Optical Tube Assembly. I started with recommended Starizona visual back and had a ton oblong stars in the corners of my ASI2600 I then bought this from amazon for $10 https://www.amazon.com/dp/B09JVMR455 Now I have almost perfect stars in the corners... maybe I need a little more back focus but haven't had the dark sky to tune it further. My ASIAir plate-solved focal length is now 1475 because I think the end of the reducer is now offset slightly from the SCT threads on the telescope. All is good for me with this solution. |
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Thanks for the suggestion John. It's ordered. Mike |
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My friend loaned me a 6.3 Celestron corrector reducer. It threads directly to the back of the scope which gives more room to focus. Since it all threads together to my imaging train should be no tilt issues. I'm going to test it tonight or tomorrow to see if it's as big a train wreck as people claim. I'll do a comparison on the same target with the Starizona Corrector. I want to see if the Starizona piece is that much better and worth all the sacrifices. Mike |
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Mike H: Hello Mike, I think I warned you to get a thinner adapter, because I suspect that may happen. The lack of room to focus with the Starizona reducer/flatnner. Anyway The suggestion of John is perfect because that one is very thin. I think I’ll buy one or two because I’m thinking in upgrading my Celestron x0.63 to the Starizona one. I found out recently that I wasn’t battling with my backfocus problem, but it was the limitations of the reducer from Celestron. Despite the Celestron reducer/flatnner gives more room to adjust focusing and have a shorter backspacing regarding the Starizona, I found out that he only covers with perfect stars up to an image circle of 15mm in my C8. Actually that model only covers those 15mm which was told me by Celestron themselfs, meaning that we are limited to sensors up to the the IMX533. The Starizona goes up to 27mm of image circle corrected. Which gives more room to work with, specially with M4T sensores like the ones I use. I don’t know if this is helpful, but you have here my intel about it. But make your own tests to confirm my results. It will be a plus in order to establish information regarding both pieces. My last opinion on this is that it will be worth it the trouble on the Starizona. I’m doing the move to one of these as soon as I find my way to get one into Europe through a family member. Best regards, Cesar |
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Until my new super short visual back arrives (7mm long so, "thinner" Cesar) arrives, I used this last night:  At least in this configuration I have some room to focus. The "stock" Celestron Corrector does leave a lot to be desired  |
