Adjust your CCD or CMOS astronomy camera tilt during the day with a laser pen.
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- เผยแพร่เมื่อ 5 ส.ค. 2021
- New video with updated parts list: • Optical test rig v2.0 ...
I built this simple rig following the article found here: www.sxccd.com/support/mainten...
And in the last video, I built my own rig, that video can be found here: • Building an optical ri...
In this video - I am trying to explain and adjust my own CCD camera with the help of that rig. It is as simple as i looks - just a laser pen and a couple of holders.
IMPORTANT! - Do not use any stronger laser than the allowed 5mw, you won't need any stronger laser anyway. It might damage the camera sensor!
Feel free to ask any questions and i will try to answer them :)
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You could also visit my facebookpage @ exophotograph - วิทยาศาสตร์และเทคโนโลยี
Thanks for sharing - great to see this in action!
My pleasure :)
I use a vertical geometry in my rig. So the camera is pointing straight down to the ground (which also makes the camera much easier to rotate than on its side) and the laser points up to the camera (from the ground) with the screen (a piece of A4 paper) lying flat on the ground. As I rotate the camera I mark the position of the bright point on the paper with a black marker - if you mark every 120 degrees rotation you end up with a triangle of dots and then it is very quick and easy to move the bright spot into the centre of the triangle and you have flattened the chip in just one go.
That sounds very interesting - I might even try to make a 3rd version of my rig :P
It is indeed better for the alignment and rotation of the camera to point it downwards... It should in theory eliminate the risk of "wobbling"
/Daniel
i also think so.can't wait to test this method
Great post, I assume you need a rock-solid optical bench setup. I wonder if an aluminum table and not wood would be better? What do you think?
Actually, I have one on order, but the wood if also very sturdy.
Hi Daniel
Interesting and I may try it on one of my ASI2600. How did you make sure that the screen is at a perfect 90° angel to your camera holder? As I understand it any tilt in the screen-plate (or holder) will cause a circular movement of the laster spot and interpreted as a tilted sensor. What you are measuring is how parallell that screen is to you sensor, if I get it right.
Cheers, Göran
Short answer - I didn't.
Long answer, I didn't notice some strange movement of the laser reflections which would lead me to assuming the plate would introduce these errors.
How ever - I have built a new version with a aluminium 20100 T-Groove rig plate with a 90 degree support bracket, so from now on, it is indeed mounted in 90 degree, or at least very close to 90 degree.
I have a upcoming video of the new parts i use in version 2 of the rig :)
/Daniel
@@ExoPhotography1 looking forward to the new video. can you include a parts list and where to buy please?
@@brianvalente The Aluminium plate I used in a later video was bought from Amazon, it is listed as 20100 extruded aluminium plate.
The rest is parts I had laying around at home.
/Daniel
@@ExoPhotography1 Thanks Daniel - the part that interests me the most is the 2" receptacle and mounting it to the board. any details on what that is?
@@brianvalente Yes, that one is made in a lathe with figures right of my head - But - You can buy one of those 2" extension tubes which i show in a video released after this one. I bought the omegon 2" 50mm extension i believe - this one is quite tight in tolerances so the "wiggle" is very well controlled.
/Daniel
:D
That was difficult to understand. Where did you get all that equipment? I don't know what would work on my ASI2600s, both of which appear to be very far out of proper adjustment. The components look expensive?
I made some my self, the wooden plank, the aluminium sheet with the white paper and the machined tube is self-made, costing almost nothing but then again, i have access to fine machines at my work.
The things i bought is the laser pen, the clamps for the tube and the aluminium bar holding the aluminium sheet. Costing around 20-30 USD. I have sience then upgraded and come up with a second solution if you can not machine the tube for your self. Check the two videos i made after this one and you get some more pointers :)
/Daniel
This seems pointless to me, there's just as much chance that the tilt in your system comes from the OTA and not the camera sensor.
For me, this is important to rule out any possible sources of errors.
As i mension in my videos, it might not be "the" problem I am fixing in the video which might have the biggest impact on my images - but all together it might.
The optical train can be seen as one unit, it isn't as strong as the weakest link.
And there is indeed cameras which have tilt in thier sensors, and this is one very easy method to correct that.
Best regards / Daniel
There are so many videos about ZWO 2600 tilt issues that it seems like ZWO is incapable of mounting a sensor correctly.
My ZWO was flawless, and still is. My Atik how ever suffered from slight tilt.
The video how ever was more a video of how you can adjust tilt with quite easy means :)
/Daniel
Can 5mW laser damage the sensor?
This report states that it can: ipvm.com/reports/lasers-cameras
This is very good points they make, I thought that Starlight Express have checked and double checked this but it might come with a warning.
The report does have some gaps though. Are the laser calibrated? Is it truly maximum 5mW?
Is it different with or without lens? (Focal point)
I will investigate this closer for sure!
Thanks for the heads up!
/Daniel
@@ExoPhotography1 Yeah. You're right. I think, if the sensor is off and used without lens, so there's no laser light converging on particular pixels it could be safe. What about your experiment? Did the sensor work as good as before the test? Thx.
The sensor was perfectly aligned from factory, so i didn’t adjust anything, and according to all my images, the tilt is non existing 👍🏻