Timotheus Posted July 24, 2016 Share Posted July 24, 2016 Hi all, simple question, can't seem to find a good answer so I thought I'd just ask the knowledgeable crowd here. So I found an Isco Video Attachment (same design as Iscorama 54, just different stretch factor). Besides being heavy, MFD is 2m which also impacts practical shooting. I have some 82mm and 86mm diopters to use so I would like to buy a step ring. Front filter size is 95mm. Thread pitch is larger than normal though...Does anyone know it's specifications and/or have suggestions for suitable step rings? Thanks a lot! IshootbeforeItalk 1 Quote Link to comment Share on other sites More sharing options...
Tito Ferradans Posted July 25, 2016 Share Posted July 25, 2016 It shouldn't be larger... I had one and it was regular 95mm. Which version do you have? Mine was Mk I. Quote Link to comment Share on other sites More sharing options...
Timotheus Posted July 25, 2016 Author Share Posted July 25, 2016 Thanks @tferradans. On the version: I have one without numerical, so just "Isco Video Attachment". I read somewhere that it's actually 1.42x, but to my eyes stretching by 1.33x looks better. Have to do some formal testing though. So by regular 95mm you mean 0.75mm thread pitch? I think i can see that the thread pitch on mine is wider/deeper (probably 1mm). Perhaps I'll just take my chances on a cheap chinese step ring, they go for a few euros on ebay. Quote Link to comment Share on other sites More sharing options...
Tito Ferradans Posted July 25, 2016 Share Posted July 25, 2016 Yeah, mine was Mk I, and it was 0.75. I used regular chinese step rings on it. http://www.tferradans.com/blog/?p=7901 If yours says 16:9 video attachment, the stretch is 1.33x, because it was designed to turn 4:3 projectors into 16:9 Timotheus 1 Quote Link to comment Share on other sites More sharing options...
Timotheus Posted July 26, 2016 Author Share Posted July 26, 2016 Haha, I feel dumb now cause the 16:9 part is kinda obvious (mine says that too yes). So 1.33x it is and I guess this guy is wrong :-) l'll be ordering the regular step rings. Thanks again Tito. Quote Link to comment Share on other sites More sharing options...
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