Ibbo! Posted September 3, 2012 Share Posted September 3, 2012 Does anybody know the spec of the 48mm filter threadsis it .5 or .6 or some imperial sizeThanksSteve Link to comment Share on other sites More sharing options...
JamesF Posted September 3, 2012 Share Posted September 3, 2012 0.75mm. Allegedly.James Link to comment Share on other sites More sharing options...
JamesF Posted September 3, 2012 Share Posted September 3, 2012 See the answer to the question "What are the thread sizes on Lumicon filters?" here:http://www.lumicon.com/faq.phpJames Link to comment Share on other sites More sharing options...
Ibbo! Posted September 4, 2012 Author Share Posted September 4, 2012 Thanks for that linkI will try a .75 and try it but my thread gauge says finer but I can't quite see which it is as I can't find my magnifying glassi could with a microscope as well as a telescope at the moment Link to comment Share on other sites More sharing options...
JamesF Posted September 4, 2012 Share Posted September 4, 2012 Reading a few other bits I found on google suggests that the cutting of the threads is not that accurate as a rule and they could be anything between 0.6mm and 0.75mm. I'd guess that as the filters rarely go on more than a few turns it's entirely possible that they could not be particularly accurate and still fit enough to be considered "working".James Link to comment Share on other sites More sharing options...
Ibbo! Posted September 4, 2012 Author Share Posted September 4, 2012 Yes I think we have read similar threads(pun intended)If its cloudy I will spin the lathe up tonight and see what happensmy concern is not to strip or cross the existing thread Link to comment Share on other sites More sharing options...
Stu_2011 Posted September 4, 2012 Share Posted September 4, 2012 Yes I think we have read similar threads(pun intended)If its cloudy I will spin the lathe up tonight and see what happensmy concern is not to strip or cross the existing threadI aim for 0.7 mm on my cheap Chinese lathe and it seems to work, a bit loose so I don't do things up to tight but it seems ok.ThanksSent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
JamesF Posted September 4, 2012 Share Posted September 4, 2012 my concern is not to strip or cross the existing threadI'm sure as long as you're sympathetic when you offer up the threads that should't be a problem.James Link to comment Share on other sites More sharing options...
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