T2, different sizes ???

Ukastronomer (Jeremy) · #1 30-01-2019, 06:30 AM

See images

The tube is from my 120mm Esprit Refractor supposedly to attach a DSLR to, the problem is that the thread is what appears to be 47mm, the threads on T2 adapters are 42mm,

Does anyone know if they do a T2 Nikon with a 47mm

At the moment I am using the adjustable "Moonfish" one

Thanks

Outcast (Carlton) · #2 30-01-2019, 09:24 AM

Jeremy,

Not 100% sure but, from a bit of googling I think you might find your SW is 48mm thread (seems to be a standard across a lot of Astro things)

You should be able to get a 42mm (female) to 48mm (male) adapter ring to make what you have work for you..

doug mc · #3 30-01-2019, 10:02 AM

Also, thread pitch can vary. Baader T2 are 42mm diameter by .75mm. I have seen 42mm x 1.0mm pitch.

bojan · #4 30-01-2019, 10:33 AM

Quote:

Originally Posted by doug mc

Also, thread pitch can vary. Baader T2 are 42mm diameter by .75mm. I have seen 42mm x 1.0mm pitch.

42x1mm is standard Pentax (but also zenit, praktica etc) thread.

astro744 · #5 30-01-2019, 01:46 PM

A wide T-Ring is available with 48mm x 0.75mm pitch thread. See https://www.telescopeadapters.com/94...format-t-rings

Ukastronomer (Jeremy) · #6 30-01-2019, 08:12 PM

so 48mm, many thanks all

Ukastronomer (Jeremy) · #7 01-02-2019, 01:27 AM

Thanks for the help, found one on Amazon and ordered it

Ukastronomer (Jeremy) · #8 02-02-2019, 09:52 PM

Thank you

Thanks to your help I managed to get a step up, or is it down adaptor, much appreciated

Mind you I did order an additional T2 adaptor on Ebay from China for my Nikon, and receive a CANON

PhilTas (Phil) · #9 03-02-2019, 03:01 PM

this link was posted to IIS recently -

https://agenaastro.com/astronomy-threads-explained.html

I've found it very informative.

cheers Phil

Ukastronomer (Jeremy) · #10 03-02-2019, 09:04 PM

bookmarked on google chrome, thanks