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Help me understand this about DIY laser tilt adjuster jigs

DIY Astrophotography
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#1 John Berger

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Posted 23 March 2025 - 09:38 PM

Okay, so I got this idea from YT about a tilt laser jig; it's shaped like a square; camera stack goes on top, face down, so much less chance of camera droop than if I use a horizontal jig; laser shoots at a steep upward angle, bounces off sensor, to the paper, so I can observe and remove tilt

 

Like this, (and I named the top board, A, and the bottom board B, to help you understand the questions I'm about to ask):

 

 

tilt jig.jpg

 

My first question is, what happens if top board A is not parallel with bottom board B; I understand that you can place a laser anywhere, for this tilt adjuster, no matter how steep the angle, as long as it hits the sensor and bounces back, but I'm concerned if the "reference board" (A) is already tilted relative to the base board, wont it cause the jig to also display the tilt being caused by board A along with sensor tilt, and therefore make my whole jig useless?

 

and that brings up the next question:

 

if the top board has to be perfectly parallel with the bottom board, what is the tolerance for that? millimeters?

 

I don't want to pay 250 euros for the AstroPrecision tool, it's just too overpriced, I doubt the actual build costed more than 100 euros, seems greedy

 

so I would appreciate any help on building this rig

 

and, if anyone is wondering, in the place of the black circle (or hole), that can be seen in my design, I plan to place a spare 2" eyepiece holder that uses a compression ring, to hold my camera stack in place (it came with my astrograph, but I'm not using it; it's the 2nd adapter from the back, in this photo https://teleskopy.pl...kar_65phq_3.jpg)

 

thx in advance


Edited by John Berger, 23 March 2025 - 09:42 PM.


#2 PeteConrad

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Posted 23 March 2025 - 10:15 PM

I built the same jig out of a dresser drawer from IKEA's scratch and dent for $10 USD and followed AstroShed's YouTube explainer here


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#3 John Berger

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Posted 23 March 2025 - 11:59 PM

I built the same jig out of a dresser drawer from IKEA's scratch and dent for $10 USD and followed AstroShed's YouTube explainer here

thank you, I was looking for his video, couldn't remember his channel

 

in the video he doesn't say anything about parallelism between the boards, just simply putting 4 boards together; after thinking about it more, I now understand that parallelism doesn't matter and the top board can even be at a 45 degree angle relative to the bottom one, (if you could position your laser in such a way that it would reach the sensor), and it would still work

 

so, mystery solved; it's good to know this jig is not complicated at all to make, I'll start building soon


Edited by John Berger, 24 March 2025 - 12:00 AM.



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