Skywatcher 130pds - DSLR Threaded Connection Advice.

[Ross1204]

Hi,

So I've been having an issue with what I believe to be camera tilt when connecting my DSLR to the stock dual speed crayford focuser of the Skywatcher 130pds. 

I removed the standard thumbscrew connection and replaced it with a compression ring adapter which I believe is still tilting the Baader coma corrector when tightening. The barrel of the corrector has a raised section which is not allowing the corrector to sit square within the compression ring.

So, this has led me to look around and see if there is a way to connect the camera through some sort of threaded setup. I have found an adapter which allows you to screw in to the drawtube which will provide a M48 connection for the coma corrector and a T-2 connection for the Canon T-ring. 

I have created a picture to illustrate the potential setup.

 

Adapter link - https://www.teleskop-express.de/shop/product_info.php/language/en/info/p203_TS-Optics-M54x1-to-T2-Adapter-fo-Skywatcher-Crayford-focusers.html

 

Does anyone know if this would work?

Would I likely have to correct the spacing somehow?

 

Thanks for reading.

Ross

Edited July 27, 2019 by Ross1204

[michael8554]

55mm from the M42 thread and 58mm from the M48 thread, looks like your adapter is designed to fit those specs.

That's the theory, but if you've read similar posts it can need adjustment - why not just try it and see.? 

Michael 

[Ross1204]

Thanks for the reply @michael8554

 

Not entirely sure if this is right but I'm thinking something like this.

 

 

The above is all founded on this line in the description I've highlighted. 

 

 

I assume that this means it will add 2.5mm into the optical path? 

If so this brings me to 57.5mm spacing right?

Ross

[Ross1204]

@Uranium235

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Dont try that TS M54 adaptor mate, its M54 thread is too short (mine nearly fell out, with camera attached!). I replaced that with a custom built M54-M48 adaptor with a much longer M54 thread, its basically:

This:

http://www.teleskop-express.de/shop/product_info.php/info/p4744_TS-M48-tilter---Tilting-compensation-for-field-tipping-in-astro-photography.html

Allen screwed to this:

http://www.teleskop-express.de/shop/product_info.php/info/p4147_Skywatcher-short-design-2--adapter-for-Crayford-focusers.html

The thread for the custom adaptor is here:

http://stargazerslounge.com/topic/215645-skywatcher-focuser-mod-mkii/?hl=%2Bfocuser+%2Bmod#entry2311103

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Would you say the threads on this adapter would be suitable for securing just a DSLR?

I am assuming you had a dedicated astro camera and filter wheel making the demand for a longer M54 thread imperative? 

Ross

Edited July 28, 2019 by Ross1204