jpelt78 wrote:
The FL notation is probably the spot for the drop in filter holder.
arbitrage wrote:
Just to see the design a bit, here are pictures from the 500PF and 600PF patents and the official 300PF from Nikon...
I notice they all use the same elements except the 600 has one extra thing at the rear labeled FL...(and the 400PF also has that FL at the rear)....otherwise all four lenses have the exact same type of elements in the same order just different diameters and I'd guess spacing based on the focal length/aperture.
Interesting....if FL is for the filter then I could see why there might be one on the larger 600PF and not the 500 or 300. However, the other patent (which I didn't post a screenshot of) was said to be for a 400 f/5.6 PF (which would be a fairly small lens, much closer to the 300PF's size) and it does have the rear "FL" section on the patent.....I wonder if that patent was misread and it is actually for what everyone really wants....ie a 400mm f/4 (which Canon's version does have a drop-in flitter)....hmmmm....
I need to go back and find which website did the patent analysis and see if there are more specifics from the 400mm patent. As I've said a few times in this thread...I see no reason to make a 400 f/5.6 PF but I can see reason to make a 400 f/4 PF....
2nd EDIT: I looked up some other Nikon patents and a recent one for a suspected mirrorless zoom lens has that FL line on the patent so I don't think it is a drop in filter....I will continue to see if I can find out what all the labels mean...because I have nothing better to do
Jul 14, 2018 at 11:40 PM
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