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  1. #18
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    Quote Originally Posted by kwun
    Neil is that directly from your 50/1.4 AIS? if so, i must say that the current production 50/1.4 AF-D that i got has much worse looking bokeh.
    yep, errr with a UV filter. at f/1.4 and f/2.0
    it's a made in Japan, serial 3849751 if that tells you anything

  2. #19
    Administrator kwun's Avatar
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    Quote Originally Posted by Neil Nicholls
    yep, errr with a UV filter. at f/1.4 and f/2.0
    it's a made in Japan, serial 3849751 if that tells you anything
    thanks. and it does confirm my believe that at f/1.4 the shape of the bokeh should be circular. and that also means that any detection of heptagonal shape in your original flower photos is purely imagination of the viewer.

  3. #20
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    Quote Originally Posted by kwun
    any detection of heptagonal shape in your original flower photos is purely imagination of the viewer.
    I guess you mean pentagonal, but it may not be imagined. There are a lot of little stalks sticking out all over the place that could produce that effect.

  4. #21
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    Quote Originally Posted by kwun
    Neil is that directly from your 50/1.4 AIS?
    sorry, I don't think it is AIS. It's older than that, a K-series according to
    http://www.photosynthesis.co.nz/niko...html#50%20fast

    here's apicture of the lens
    http://img411.imageshack.us/img411/4527/dsc00079cx5.jpg
    on the silver ring, there is the big black line to indicate aperture
    but what are the other smaller coloured lines for?
    and what is the little red dot?

  5. #22
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    Those markings could be the depth of field markings at various apertures.

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    Regular Member red00ecstrat's Avatar
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    cheung is absolutely right and that little red dot is an infrared focus mark.

  7. #24
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    Quote Originally Posted by Cheung
    Those markings could be the depth of field markings at various apertures.
    ahhh, that makes sense, thanks.
    some googling makes me think the red dot is a focusing mark for infra-red.

  8. #25
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    Quote Originally Posted by red00ecstrat
    cheung is absolutely right and that little red dot is an infrared focus mark.
    Thanks, I was just finding that out when you posted
    Last edited by Neil Nicholls; 03-15-2007 at 11:05 AM.

  9. #26
    Administrator kwun's Avatar
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    here is a the bokeh quality of a recent production 50/1.4AF-D at f/1.4. as you can see, it is pretty ugly. but as mentioned, it is a circular pattern as it was shot wide open.
    Attached Images Attached Images  

  10. #27
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    Quote Originally Posted by kwun
    here is a the bokeh quality of a recent production 50/1.4AF-D at f/1.4. as you can see, it is pretty ugly. but as mentioned, it is a circular pattern as it was shot wide open.
    This is very poor bokeh. Its edge is bright and too well defined. Imagine this same bokeh as the sun and then a thick cloud moves in to cover the sun completely, you will then see a good bokeh with no distinct edges and more fuzzy-like.

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