How to get the BEST collimation on your SCT!
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- เผยแพร่เมื่อ 27 ส.ค. 2024
- Review of how to use a tribahtinov mask and what difference it makes vs the old way to collimate. I show photos taken with my Celestron C9.25 both before and after using the tribahtinov mask and the difference is obvious!
You can buy tribahtinov masks at Agena Astro. Go to:
bit.ly/3qfWaZS
and search for Tribahtinov mask. Be sure to get the size that fits your scope.
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#astrophotography #bahtinov #telescope
This is exactly the simple info I was looking for. Over the decades, like you, I’ve wasted hours attempting perfect collimation by the technique given in the manuals of my early C8 and C5… Thank you for this introduction. The before and after images of Jupiter are amazing!
Thanks!
This is very helpful! Thank you!
Great! Hope you get some sharp images!
That looks like an excellent device! I also have the Edge 9.25” and I struggle with the ‘regular’ collimation method. Thank you!
I think you’ll love the result!
@@AZASTROGUYI just ordered a 3D printed one from eBay 👍
I didn't know about this, just ordered one, thanks for the tip!
Thanks! I’ve been struggling with the same thing on my old, old C8. I have a laser collimator, but it just doesn’t do very well.
Just found your channel and I am new subscriber. Very nice job on your video. I have the Celestron 9.25 but haven't bought the hyperstar yet. I also have the AM5 but haven't tried the scope on that mount yet. Have you had good results with the 9.25 and particularly with the hyperstar attached? Looking forward to more videos.
Absolutely! The C9.25/Hyperstar on the AM5 (with an 11 lb counterweight) and the ASIAir routinely guides at 0.5". It's one of my favorite set ups. Easy to polar align and tracks perfectly.
@@AZASTROGUY Sorry, one more question. Is the bathinov mask modification something you did or did you buy it somewhere.
@@marvinwhisman3333 Get it here from Agena Astro: bit.ly/3qfWaZS
didn" know about this type , thank you!
I have an 8-inch SCT and an 8-inch rasa. I see they make different masks for both telescopes even though they are both 8". Do you know if I can use one mask for both scopes, or does the f/ value affect things? Are you able to use the same mask for your scope with and without the hyperstar attached? I imagine that's pretty close to the same difference as an sct vs rasa.
1 8 inch mask will work for a C8, a C8 hyper star, and an 8 inch rasa
can you talk more about how you know which screw to adjust based on the pattern of the 18 pointed star?
While looking at the image put a finger in front of the corrector plate beside one of the screws. You will see a shadow in the image. Move your finger until the shadow is over the screw with the asymmetric star.
Thanks for the good information and link to the mask. What guidescope and camera are you using with your SCT?
evostar 50
Great tip 👍🏻
Like you, collimating my 8" Edge HD using the donut method just doesn't feel like I get it as good as it can be. I wasn't aware the tribahtinvo could be used for that, I only thought it could be used to help focus. I'm assuming you get the best focus you can by eye before using the mask for collimation, correct? You have my attention but I would have like to see a little more of the steps you go through.
Yes that is correct. Focus by eye first. You can even use a normal bahtinov mask to tighten up the focus. But when you then switch to the tribahtinov mask, you'll see one or more of the screws need adjustment to get 3 perfectly symmetric star patterns. And even a subtle difference between not quite symmetric and truly symmetric will make a difference in your image quality. Good luck!
Thanks
Do the same principles apply to Maksukov scopes?
Yes!
At 2:18 where you write "only far left to far right is symmetrical" are those the ones that determine focus while the other four show collimation?
No. Think of collimation happening in 3 axes, one for each screw. Each elongated '6 pointed star' corresponds to one screw. If two are set correctly, you'll have two symmetric 6 pointed stars and one where the center line is offset
So It would be important to focus first with a regular bahtinov mask before using the tri-bahtinov or you might not know if the problem is collimation or focus correct?@@AZASTROGUY
Before the collimation, do you need to focus first?
@@MrWeesontan yes
Are the inner arrows or the outer arrows of the tri-bahtinov supposed to line up with the collimation screws?
Inner
I was under the impression that the tri-Bahtrinov mask is for focusing, not for collimation. There is a separate part that often comes with tri-Bahtinov masks that is (I think) called a Duncan mask that is there to help with collimation. I had a tri-Bahtinov mask 3D printed for me by a friend, and I find that not all of the three-line images line up when focusing, so is that a sign of poor collimation?
The Bahtinov mask is for focusing. The Tribahtinov mask is for collimation. Yes to your second question. AFTER focusing with a bahtinov mask, put on the tribahtinov mask and adjust the screws until the pattern is symmetric as I show in the video. Good luck!
This looks pretty cool. I'm going to have to try it out. Thanks!
How do you measure perfect symmetry? Your collimated scope doesn’t have symmetry at left bottom.
It's a visual perspective, but a lot easier than judging out of focus circle symmetry. Agree bottom could have been tweaked a bit
Is this the same principle as using a torch through a pinhole to collimate?
No. It is essentially three Bahtinov masks in one, rotated over 120 degrees. It gives you three lines and three crosses to check collimation, along three axis simultaneously. So, in addition to focusing, the tri-Bahtinov mask also indicates collimation status along three axis.
@@AZASTROGUY I might try this to collimate mine, having a hard time getting it finely tuned ,i think my corrector plate is slightly off for some reason but not really sure how to fix it.
Can you use this method for a reflector scope?
No because it doesn't have a secondary mirror in a corrector plate like an SCT does
Unfortunately no explanation what to look for except a round star. What about the spikes??
I explained in the video that once you're on a star you'll get the 18 point shape as shown. You turn the collimation screws until all the lines are symmetric. I didn't say to look for a round star except in my explanation of the 'old method' for collimation
I think you need to watch it again. It’s clearly explained
Hi,
Can I use same mask for collimating the RC?
Yes so long as it fits
Did you collimate during the day in a dark space using a artificial star?
No
Any thoughts on how to collimate the Hyperstar?
You use the screws attached. I think Starizona has instructions
You didn't show how to use it!!!!!!!!!!!!!!!!!!!!
I explained you simply turn the collimation screws until the pattern is symmetric