Archived posting to the Leica Users Group, 2009/02/14

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Subject: [Leica] Some M8 Images
From: henningw at archiphoto.com (Henning Wulff)
Date: Sat Feb 14 00:46:54 2009
References: <6af76ca00902121230k459835fcvf5660064adb7eddf@mail.gmail.com> <36172e5a0902121322ocd9c27cn3dbaa50a892bb3b1@mail.gmail.com> <p06230905c5bac5b918ad@10.0.1.199> <36172e5a0902130152j270c9b3at71f96e9df01a23c1@mail.gmail.com> <p06230906c5bba80a0f2d@10.0.1.199> <36172e5a0902131534g44a37373tf5ff4e4d623d17db@mail.gmail.com>

At 9:34 AM +1000 2/14/09, Geoff Hopkinson wrote:
>Henning I follow. I was thinking about UV attenuation when I assumed the
>window glass would reduce IR too. Sounds like that we agree on my moon
>reflection.
>Care to comment on the elements described in my cantina shot?. I'm not
>convinced those are window glass reflections.
>Did you look at Nathan's pub shot, Alternate 9? No window involved there. I
>think that both of these are internal reflections related to having a filter
>on (not just UV/IR)  I don't think that any of these are sensor bloom
>either.
>
>Probably I'm the only one thinking (too deeply) about these technical
>aspects ;-)
>Thanks for contributing on this and other areas when I post opinions.
>

I think in the Cantina shot those _are_ window reflections, and the 
visibility and placement are completely due to relative light levels, 
albedos or emission intensity of the objects and angles. As soon as 
you shoot through windows you get them. As I mentioned before, window 
glass is much, much more reflective than even single coated filters, 
and will often have relatively brightly lit objects behind them. 
Remember also that each sheet of glass has two surfaces, so things 
like your arm are reflected twice (out of focus) and are additive.

I don't know which shot of Nathan's you're referring to (he has taken 
a lot of pub shots :-)).

I'll be gone for a couple of weeks, so continuation of this thread 
won't happen. In any case, expect reflections if you shoot through 
windows, but don't let that stop you. :-)


-- 

    *            Henning J. Wulff
   /|\      Wulff Photography & Design
  /###\   mailto:henningw@archiphoto.com
  |[ ]|     http://www.archiphoto.com

In reply to: Message from crbirchenhall at googlemail.com (Christopher Birchenhall) ([Leica] Some M8 Images)
Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] Some M8 Images)
Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] Some M8 Images)
Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] Some M8 Images)