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Adapter weight limit and thread depth

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5 replies to this topic

#1 feygan

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Posted 16 April 2019 - 04:29 AM

Hello everybody,

 

It's my first time using adapters and I've got some concerns.

 

I'm using an iOptron SkyGuider PRO mount and on top of that I got a really sturdy ball-head from Manfrotto.

I recently bought a William Optics Zenithstar 61 Refractor and I plan to use it with my Sony A6300. The thing is that my camera will stand on the ballhead and the refractor will be connected to the camera with some M48 adapters

 

Here is a very crude drawing of the setup:

badpaint.png

 

And here is the adapter (made of some metal alloy) that will connect everything:

Webp.net-resizeimage.jpg

 

Basically my question is: is the "thread depth" long enough to support around 2 kg of weight? What is the general rule of thumb to consider when screwing adapters one into another?

 

PS: This might be a silly question, I'm really bad at handy-work / mechanics smile.gif

 

Thanks!


Edited by feygan, 16 April 2019 - 04:33 AM.


#2 RaulTheRat

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Posted 16 April 2019 - 04:45 AM

It'll be fine, you'd be surprised how much load that much thread could support...

Any concerns, just thread it together and give it a good wobble - if you can't feel it moving it's fine.
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#3 CharlesW

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Posted 16 April 2019 - 09:38 AM

Can you attach the scope foot to the Skyguider. It will be a lot more stabile. 


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#4 OldManSky

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Posted 16 April 2019 - 01:16 PM

Can you attach the scope foot to the Skyguider. It will be a lot more stabile. 

Yes, that.  With your camera on the back of the Z61, the center of balance will be right about where the scope's foot is.  Attach it to the mount there, not at the camera, where ALL of the weight will be hanging off the front of the camera.  My worry wouldn't be how much your adapter can take, it would be how much your camera's mount can take.  Having that snap off would be really, really bad.


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#5 Stephen S.

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Posted 16 April 2019 - 01:27 PM

Can you attach the scope foot to the Skyguider. It will be a lot more stabile. 

+1



#6 feygan

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Posted 17 April 2019 - 02:29 PM

I just attached the scope foot directly to the mount as you guys suggested and it seemed very solid.Thanks everybody for the advice!


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