2" Nosepiece to T-2/M48a

The optical length with T-2 adapters threaded on both sides is 26mm. But in that case you could also use a simple T-2 extension, available in 7.5, 15 and 40 mm

You need an adapter from SC-thread to T-2. You can use e.g. Baader T Adapter (BTA) for SC and MAK Telescopes (T-2 part #21) # 2408160

You can use this nosepiece and any T-2-ring to equip your camera with a standard 2" nosepiece and insert it into your telescope like any 2" eyepiece. Please check the manual of your telescope to see if it is suited for astrophotography - at some Newtonian telescopes, you need to remove some adapters from the focuser to reach focus; this should be described in the manual of the telescope. We do not sell Sky-Watcher-telescopes, but as far as we know, the 200PDS is one of the telescopes where you have to remove an extension from the focuser.