Micro Four Thirds Focal Reducer Shootout

Started Feb 20, 2014 | Discussions thread
pmus2017 New Member • Posts: 1
Re: Shootout Part 2: Hotspotting

Hi Brian. Thanks very much for your article showing the hotspot issue. I have just bought the Speedbooster ULTRA for use with the Panasonic GH5 and my Sigma EF mount lenses and am getting the central bluish haze very badly on my Sigma 17-50mm f2.8 EX lens. I thought it was a fault but your article is the only thing I can find online & explains the issue. I understand that my lens has a much larger exit pupil distance (140.7mm to 187.4mm) which would explain why it is even worse than the 18-35mm lens you examined. I need to find a suitable alternative lens for my zoom but am finding it hard to get the exit pupil data from Canon ( they have a 17-55 f2.8 IS lens as well ). Do you have access to that data? I am hoping that there is another similar zoom available that avoids the issue, otherwise I may not be able to use the Speedbooster after all.

Post (hide subjects) Posted by
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow