Perkil8r Posted June 7, 2012 Share Posted June 7, 2012 As title really. In the end of the standard R&P focuser on the ST80 there are some threads. I've not measured them as I don't have any thread gauges and can't find my "very near caliper" but I'm guessing at approx 34mm. Any ideas what they are intended for, or if it's possible to get a filter that would screw in? I know you can get 34mm filters, is this even remotely plausable? If not, what are they there for? It makes no sense to spend money using a threaded tube if there is no reason for it, so I doubt they are not intended. Link to comment Share on other sites More sharing options...
Guest Kheldar Posted June 7, 2012 Share Posted June 7, 2012 Slightly confused here can you post a pic? The black bit screws onto the end of the draw tube, and any T2 extension screws onto the black bit. Link to comment Share on other sites More sharing options...
Perkil8r Posted June 7, 2012 Author Share Posted June 7, 2012 Yes Stephen, but inside that black bit is a screw thread approx 34mm dia..... waiting for battery to charge then will post a pic. Link to comment Share on other sites More sharing options...
Guest Kheldar Posted June 7, 2012 Share Posted June 7, 2012 Never saw that thread, it's not a standard as far as I'm aware as normally the EP or diagonal will go into there ... #intrigued Could they be machining marks rather than a real thread? Link to comment Share on other sites More sharing options...
Perkil8r Posted June 7, 2012 Author Share Posted June 7, 2012 (edited) Definately threads. Too clean and definately pitched, not individual rings. It's a little coarser than T thread and obviously smaller too. It goes all the way through. got fed up with the 300D so took them with my phone lol Edited June 7, 2012 by Perkil8r Link to comment Share on other sites More sharing options...
Perkil8r Posted June 7, 2012 Author Share Posted June 7, 2012 If it is 34mm filter thread, I could unscrew it off the main focus tube and screw a filter on the inner end I think. The thread certainly looks like it's been machined for a purpose rather than just left over from a machining process. Link to comment Share on other sites More sharing options...
glider Posted June 7, 2012 Share Posted June 7, 2012 The inner 'thread' isn't actually anything except a light baffle to cut down reflections. However, if it is a handy size then you might be able to actually make use of it. The outer thread is T2. Link to comment Share on other sites More sharing options...
Perkil8r Posted June 7, 2012 Author Share Posted June 7, 2012 I'll have to try and get hold of some measuring equipment and get some identification. If it is 34mm filter thread that would be a bonus. Link to comment Share on other sites More sharing options...
Perkil8r Posted June 8, 2012 Author Share Posted June 8, 2012 Measured it and it is 34mm x 1.25mm pitch. 34mm filters are 0.75mm pitch so will not work Was worth a look though, still begs the question of what they are there for though.......... Link to comment Share on other sites More sharing options...
glider Posted June 9, 2012 Share Posted June 9, 2012 It's just a light baffle to stop stray reflections. Link to comment Share on other sites More sharing options...
Perkil8r Posted June 9, 2012 Author Share Posted June 9, 2012 That's a disapointment really, it would have been just as easy to make it 34mm x 0.75, still had the same effect but also then taken 34mm filters. Link to comment Share on other sites More sharing options...
andyboy1970 Posted June 28, 2012 Share Posted June 28, 2012 The 127Mak has them too. Link to comment Share on other sites More sharing options...
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