JordanWright Posted June 7, 2018 Share Posted June 7, 2018 So I ordered a Tokina 28-70mm 2.6-2.8 EF from eBay but after testing it, it seems that it doesn't reach anywhere close to infinity focus on the wide end. does anyone know of a fix to this or will I have to return? Im using a GH5 with a Speedbooster XL. Here is a comparison between 28mm, 50mm and 70mm focusing on the kettle/ infinity. Quote Link to comment Share on other sites More sharing options...
Phil A Posted June 7, 2018 Share Posted June 7, 2018 It actually might be the combination with the speed booster. Did you try to adjust the optical element to fix it? http://www.metabones.com/article/of/infinity-adjustment-speed-booster-only I also heard that with some focal reducer brand/model + lens combinations, there are issues that it's not possible to get perfect infinity focus. JordanWright 1 Quote Link to comment Share on other sites More sharing options...
JordanWright Posted June 7, 2018 Author Share Posted June 7, 2018 Thanks for the tip, will buy a screwdriver to get into that screw and report back! Quote Link to comment Share on other sites More sharing options...
JordanWright Posted June 7, 2018 Author Share Posted June 7, 2018 So I tried adjusting the speedbooster but it only made it worse and didnt spin in the other direction... maybe the speedbooster is a dud Quote Link to comment Share on other sites More sharing options...
anonim Posted June 7, 2018 Share Posted June 7, 2018 Maybe to try first with some dumb adapter? Try also behavior in regarding to f value... I'd rather say that problem is with lens. JordanWright 1 Quote Link to comment Share on other sites More sharing options...
JordanWright Posted June 8, 2018 Author Share Posted June 8, 2018 Update: I removed the optical block from the speedbooster and the issue remains which leads me to believe that it is in fact an issue with the lens itself. Quote Link to comment Share on other sites More sharing options...
JordanWright Posted June 8, 2018 Author Share Posted June 8, 2018 I still don't quite hit infinity with my 44-2 but I think its due to the £5 amazon adapter im using. Ill be testing some more lenses after a shoot tomorrow. Thanks for the help guys! Quote Link to comment Share on other sites More sharing options...
anonim Posted June 8, 2018 Share Posted June 8, 2018 I wish you successful resolving... But, one of the reason I dropped usage of adapted vintage lenses is painful trying to achieve infinity focus, especially (almost impossible) with wide lenses. JordanWright and Phil A 2 Quote Link to comment Share on other sites More sharing options...
Shirozina Posted June 8, 2018 Share Posted June 8, 2018 1 hour ago, JordanWright said: Update: I removed the optical block from the speedbooster and the issue remains which leads me to believe that it is in fact an issue with the lens itself. That won't work as the adaptor body is not the same thickness as the non speedbooster adapter. With speedboosters the adjustment if you are short of infinity is to wind the optical group towards the sensor. PannySVHS, JordanWright and Geoff CB 2 1 Quote Link to comment Share on other sites More sharing options...
JordanWright Posted June 8, 2018 Author Share Posted June 8, 2018 Thanks, ill be testing some more modern lenses tomorrow! Quote Link to comment Share on other sites More sharing options...
JordanWright Posted June 11, 2018 Author Share Posted June 11, 2018 Tried the 28-70 on a canon camera and it behaved perfectly. New metabones XL should arrive tomorrow. Quote Link to comment Share on other sites More sharing options...
JordanWright Posted June 12, 2018 Author Share Posted June 12, 2018 SUCCESS! Just to finish this thread, I replaced the eBay purchased Metabones XL with a new one. The new one had much tighter tolerances and even a weather sealed gasket on the back. I had to adjust the infinity focus a small amount but now my XL and Tokina 28-70mm work great together! PannySVHS, Snuff, anonim and 2 others 5 Quote Link to comment Share on other sites More sharing options...
Azores78 Posted December 18, 2020 Share Posted December 18, 2020 I just bought recentely the same lens and cannot achive infinite focus with a focus reducer. Tryed on a nikon camera and the problem remains. Is there any way to ajust the backfocus of this lens. Any sugestion? Quote Link to comment Share on other sites More sharing options...
PannySVHS Posted December 18, 2020 Share Posted December 18, 2020 @JordanWright No, don´t finish this thread. Always beautiful to see that Tokina in action. I have it in Nikon mount and it still waits to be used much more. Such a gem! andrgl 1 Quote Link to comment Share on other sites More sharing options...
Papiskokuji Posted December 18, 2020 Share Posted December 18, 2020 I had many Tokina APS-C 11-16mm, they all had infinity focus issues. Canon lenses for instance go past infinity focus, there's a margin of error, meaning you're sure to hit infinity focus. The Tokinas, they're right on the infinite or just before... They also have lots of chromatic aberrations which I can still see on your picture. Those problems with their lenses are a shame as I otherwise like their products. andrgl 1 Quote Link to comment Share on other sites More sharing options...
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