Hi Paul,I hope you enjoyed your Camping Trip
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I recently got some T-adapters for the 3 Nagler T6's, so they are all effectively 2", handy that because I only need one filter size.
Could you please explain or show a photo what you mean

I have never heard of them before

I will be picking up a 2" UHC today which I am looking to trying on the 17 mm Nagler

I have mainly 1.25 eyepieces except for my type 4 17 mm Nagler and a
55mm university optics
The 13mm Nagler is a 1,25" or can be used in the 2" mode

Cheers