2"-1.25" Twist Lock adapter

[Portech7]

Hi All

Question, has anyone experienced any focusing problems with a 2"-1.25" twist lock adapter? On my SW Explorer 150P I removed the existing 1.25" adapter from the 2" focuser draw tube and replaced it with the new adapter and inserted my eyepiece, but I cannot seem to get focus any where along the travel. If I add a 2" extension I can get focus but then the draw tube goes too far towards the secondary mirror. Is this a common issue?

I'm not too worried as it greatly helps centering for collimation, however I do see the benefits if I can get it to work.

Any thoughts welcome.

Cheers

[Ricochet]

On the SW Newtonians the standard 2" and 1.25" eyepiece clamps are also extension tubes. It is the expected behaviour that if you choose to use a 2"-1.25" reducer instead of the 1.25" eyepiece clamp/extension you must leave the 2" eyepiece clamp/extension fixed to the focuser for all eyepieces. 

However, if you use 2" eyepieces you will soon also want a 2" Clicklock. In this case you should take careful measurements to determine which parts(s) you will need to buy so that the focuser tube is the correct length in order to achieve focus.

[Portech7]

Hi Ripochet, that confirms my thoughts as the 2" extension with the twist lock did work but I didn't like how far I had to rack it in to get focus.

I'm still new to astronomy and learning as I go. I have found it very useful for collimation which is worth its money just for that purpose.

Cheers 👍👌