Perkil8r Posted March 9, 2012 Share Posted March 9, 2012 Might be a dumb question but how does one go about fitting a light pollution filter when using DSLR on a t ring directly onto the 2"-1.25" adaptor on a 200p? Most lp filters I have seen are either 1.25" or 2" ep thread. Link to comment Share on other sites More sharing options...
Guest Eddy Posted March 9, 2012 Share Posted March 9, 2012 You need a filter for the camera I believe Link to comment Share on other sites More sharing options...
andyboy1970 Posted March 10, 2012 Share Posted March 10, 2012 (edited) Can you post a picture of your T-ring? Not 100% sure but I think this is the T-ring I have - http://www.ebay.co.uk/itm/T-mount-ring-m42-0-75-camera-adapter-Canon-EOS-/130586550359?pt=UK_Telescope_Adapters&hash=item1e6790a057#ht_1063wt_1110 With mine I can unmount 2" filters and put them into the T-ring with the locking ring from the filter assembly. Edited March 10, 2012 by andyboy1970 Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 10, 2012 Share Posted March 10, 2012 If you're using a 200P, sooner rather than later you're going to start thinking about a coma corrector : these have 2" filter threads on the end that push fits into the 2" EP holder. Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 This may help http://www.telescope...S_clip_fit.html a few people i no use these and they ae really good o so they tell me chees Pat they want to be good at that price I nearly spat tea over my laptop! I can see a DIY filter coming on Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 10, 2012 Share Posted March 10, 2012 they want to be good at that price I nearly spat tea over my laptop! I can see a DIY filter coming on I can guarentee you the only way to beat that filter is with an even more expensive filter Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 (edited) I can guarantee you that the SWMBO will certainly beat me around the head with it! lol Just had a quick look, all I need to do is find a filter with the same thread as the eye piece holder, screw it in before I attatch the t ring thingy. Hmmm, anybody know what thread size that is? Edited March 10, 2012 by Perkil8r Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 10, 2012 Share Posted March 10, 2012 I don't follow (picture may help,) if you've got the t-ring on the focuser, you aren't using an EP holder? Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 This one: Link to comment Share on other sites More sharing options...
andyboy1970 Posted March 10, 2012 Share Posted March 10, 2012 OK, the bottom righthand picture is with the T-ring in place isn't it? Measure the thread diameter inside the camera end of the T-ring as it is probably the same size as a 2 inch filter internal thread. Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 (edited) it is yes, There is no thread as such on the camera end of the t ring, there is a bit of t ring thread spare though. Edited March 10, 2012 by Perkil8r Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 10, 2012 Share Posted March 10, 2012 How do you fit a 2" (M48) thread inside a T2 ring (42mm)? Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 How do you fit a 2" (M48) thread inside a T2 ring (42mm)? You use an unobtanium tap This is why I'm asking, I don't have any filters to try or measure, so trying to figure a way to do something that doesn't involve spending £140 lol Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 10, 2012 Share Posted March 10, 2012 I think it will cause more harm than good, but you can get one of these />http://www.scopestuff.com/ss_tfa1.htm I use one in my T2 chaing from DSI to T2 extension. Holds a 1.25" filter in the chain. HOWEVER putting it in the path to a DSLR sensor is going to cause major vignetting and reflections I would of thought ..... Prime focus using native T2 threads does not lend itself to adding filters, fact of life unfortunately. You typically have to go down the clip in / 2" nosepiece / coma corrector route. Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 Just seen this http://www.firstlightoptics.com/adaptors/max-dslr-camera-adaptor.html Whilst it won't fit the EOS, I suspect the camera mount part comes off if you undo the 3 grub screws. This is the same as my T ring adaptor, so the two might go together maybe. Then I could fit a 2" filter. Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 10, 2012 Share Posted March 10, 2012 There's an EOS version available from other stores. You just need to verify you have enough back focus to use that. Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 Does the knurled ring not sit flush like with the T ring when fitted? Can't really tell from the picture I guess. Might be worth looking further into though. Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 10, 2012 Share Posted March 10, 2012 Mine did, see PM I sent you though Link to comment Share on other sites More sharing options...
Perkil8r Posted March 10, 2012 Author Share Posted March 10, 2012 PM replied to I don't have much travel left to play with when focused, although when using the barlow I have loads, but that being the case I could use a 1.25" filter anyway. Link to comment Share on other sites More sharing options...
andyboy1970 Posted March 10, 2012 Share Posted March 10, 2012 I will try and get a picture of my T-ring. Yes one side is M42 and screws on to where the drawtube is unscrewed from but the camera bayonet side is larger and on mine the internal part of the camera side is M48 which is 2" filter size. Link to comment Share on other sites More sharing options...
andyboy1970 Posted March 11, 2012 Share Posted March 11, 2012 As promised. Link to comment Share on other sites More sharing options...
Perkil8r Posted March 11, 2012 Author Share Posted March 11, 2012 Ahh, I see, Mine is a smaller ID than that and smooth. Where did you get that from, which manufacturer? Link to comment Share on other sites More sharing options...
andyboy1970 Posted March 11, 2012 Share Posted March 11, 2012 (edited) I think it was the one I mentioned earlier in this thread, on Ebay. Should point out that the filter is taken out of its mount and secured using its retaining ring, you can see this retaining ring just below right hand yellow arrow in the bottom picture. Edited March 11, 2012 by andyboy1970 Link to comment Share on other sites More sharing options...
Perkil8r Posted March 11, 2012 Author Share Posted March 11, 2012 Thanks, I'll have a look into it in more detail I think. Link to comment Share on other sites More sharing options...
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