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Victor Boesen

Which adapter? T2, M48, M42 to 2"

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I'm purchasing an adapter for my camera to be mounted to my skywatcher 72 that supports filters. I'm looking at the following two but I don't know whether my current T-ring(or whatever it is) is an M42 type or M48.

https://www.astroshop.eu/extension-tubes/omegon-extension-tube-nosepiece-2r-ver-2-m48-to-2r-/p,21988

https://www.astroshop.eu/extension-tubes/omegon-extension-tube-nosepiece-2r-ver-1-m42-to-2r-/p,21987#tab_bar_0_select

Here are some pictures of the "t-ring":

69817454_735941396846692_8772982464613187584_n.jpg?_nc_cat=106&_nc_oc=AQn1vNucOTYx0RkZDWvASay6q1T71IIR4iCzpbZp5QqRrTBBRW8lOeCh8mhID5Za_Wo&_nc_ht=scontent-arn2-1.xx&oh=6bd75c1a756c648a844929b4e4ddbd96&oe=5DF2B0CB70284274_2412228185664859_3690692996912644096_n.jpg?_nc_cat=104&_nc_oc=AQmWtcfCIC1goBQD57If6927HrYhhqTpNEZ3Ye0NoFNMkfIvj1lXIxfWK2UkrYDEz6c&_nc_ht=scontent-arn2-1.xx&oh=d902999c41f8cb1c2be39c5fd157c1cc&oe=5E102A46

Thank you in advance!

Victor

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If you are using a full frame digital SLR the 48mm is better, as you can get slight vignetting with the 42mm T thread, with a crop frame sensor it probably doesn't make much difference.

John 

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Just now, johnturley said:

If you are using a full frame digital SLR the 48mm is better, as you can get slight vignetting with the 42mm T thread, with a crop frame sensor it probably doesn't make much difference.

John 

I'm using a nikon d3300 which is a crop sensor.

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Victor- Can you measure the diameter of your t ring aperture as shown in your first picture (the threaded part not the bayonet that connects to the camera. ) if it measures approx 48mm you need the first  item you linked, if it’s 42mm then you need the second version. You don’t need precise measure- a ruler across the opening should make it obvious.

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7 minutes ago, catburglar said:

Victor- Can you measure the diameter of your t ring aperture as shown in your first picture (the threaded part not the bayonet that connects to the camera. ) if it measures approx 48mm you need the first  item you linked, if it’s 42mm then you need the second version. You don’t need precise measure- a ruler across the opening should make it obvious.

Thank you very much! It measures 42mm so I will buy second one:)

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