DarthVader There is no such thing as Title Fairy ever  6,513 posts Likes: 42 Joined Apr 2008 Location: Death Star More info | Dec 19, 2014 14:02 | #1 Nikon/Fuji.
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smythie I wasn't even trying More info | Dec 19, 2014 15:30 | #2 Hmm, the 77mm filter thread suggests to me that either it won't be the full 300mm or f/4
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Dec 19, 2014 20:15 | #3 smythie wrote in post #17341794  Hmm, the 77mm filter thread suggests to me that either it won't be the full 300mm or f/4 Why? The current 300 f/4 takes 77mm filters.
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smythie I wasn't even trying More info Post edited over 8 years ago by smythie. | Dec 20, 2014 05:26 | #4 which suggests that the current is also either not the full 300mm or the aperture is not the full f/4.
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Bob_A Cream of the Crop  More info | Dec 20, 2014 22:23 | #5 smythie wrote in post #17342567 which suggests that the current is also either not the full 300mm or the aperture is not the full f/4. 300/4 = 75mm: This leaves just 1mm between the mid point of the cross section of the filter thread and the edge of the front element as a minimum (or in practice less than 0.5mm between the inside edges of the filter thread and the edge of the front element). Correct. The actual focal length is probably a bit under 300 (i.e, ~290mm). The Canon 300mm f/4 also takes a 77mm filter. Bob
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