Archived posting to the Leica Users Group, 2009/02/13[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
See Alt nine in Nathan's recent fishy senorita post!! 2009/2/13 Geoff Hopkinson <email@example.com> > Henning I meant that I wouldn't expect significant IR from those subjects > behind glass. I agree those subjects would not be big IR candidates anyway. > I assumed that the window glass would attenuate IR as well. Sounds like I > should not have linked the two ideas. I'm no scientist there certainly. For > fun I must have a play and educate myself on that now. > > Regarding the small blue highlights, I have seen secondary mirror images of > point light sources in some of my shots. For example this shot with the 75 > Summicron and UV/IR. (4 second exposure). You should be able to make out a > ghost image of the moon crescent as well as some stars repeated as blue > dots. I assumed this was due to reflections back into the camera from the > filter. I based that on an article in the Feb 2007 LFI demonstrating this > with a night street shot of street lights and headlights. The article > states > that the ghost images are caused by the presence of the filter. > http://gallery.leica-users.org/v/gh/a/ns/Sky.jpg.html > > In Chris's shot you can certainly see a set of reflections on the window > glass. I love to play with reflection shots like this myself which is > partly > why I was staring into this enjoyable one by Chris. I believe that the two > blue spots above the girl to the left, are a ghost of another set of > reflections on the window glass! The blue colour is a clue to me. Note the > yellow original sets above and to the left that are on the window glass I > think. Never mind just some technical opinion from me that I thought might > be of interest. As a practical matter those spots are easy to retouch of > course. > I put another up for discussion on this subect > http://gallery.leica-users.org/v/gh/a/usa/f/Cantina.jpg.html > This is a 28 uncropped, through a window at close range. Of interest maybe > is you can see my left arm and watch over the back of the guy to the left > and I think our table edge on the lady's back to the right. Look at the hat > of the background guy to the right and the blonde hair of the lady just > below her left ear position. You probably need to look at the larger > version > to see more clearly. Anyway I find these details fascinating to learn > about. > I'd value any comment from you, or others. > Cheers > Geoff > 'Licence to Chill' > > > > 2009/2/13 Henning Wulff <firstname.lastname@example.org> > > A nice set, Chris but to clarify what Geoff has written: >> >> The window glass won't do anything for/against the IR. Your available >> light just happens to be low IR content, which is usual in winter. >> >> The reflection may or may not be due to the UV filter. It looks like the >> picture is shot through glass, the most likely cause is the window glass >> as >> that causes way more reflections than filters, an of a somewhat different >> type. >> >> >> >> >> Chris that is a thoughtful and well constructed group. The second ice shot >>> is especially appealing. >>> There's nothing in any of the content that might provide a reason for the >>> UV/IR . >>> If you'd like a technical comment on that aspect,look at the >>> Selfridges shots. I suspect that the window glass has prevented any >>> possible >>> mis-rendering of the dark fabrics anyway. But your UV has given you the >>> same >>> minor artefacts that a UV/IR (or any filter) would have. See the small >>> blue >>> internal reflections (second shot) of the point light sources? >>> >>> 2009/2/13 Christopher Birchenhall <email@example.com> >>> >>> LUGers >>>> >>>> I took my recently acquired M8 out with a LTM 50mm Summicron f2 >>>> collapsible on two occasions. This lens came as part of a very >>>> collectible IIIf R/D kit. I am not a collector so I decided to cash in >>>> the body and case (sigh). But the lens is for me one of my best. We >>>> get on very well. We "clicked" :-) One or two of these pics may >>>> appeal but I can't but offer to share my delight at using the new >>>> electronic camera with a "peach" of a classic lens (with a standard UV >>>> filter and no 6-bit coding). >>>> >>>> I managed to get into the centre of Manchester (UK) with some good >>>> winter sunlight. Some of the subject matter (graffiti/street art?) may >>>> not appeal to all but I am ok with this stuff - a couple do involve >>>> the "fair" sex? >>>> >>>> http://gallery.leica-users.org/v/crb/M8/Manchester/ >>>> >>>> We had a quick walk along my staple venue (Macclesfield Canal) when it >>>> was cold and the canal was partly frozen - a barge had clearly passed >>>> through and broken up the ice - we had a fine half pint of a winter >>>> warmer ale half way through! >>>> >>>> http://gallery.leica-users.org/v/crb/M8/canal/ >>>> >>>> Needless to say C&C are welcome. >>>> >>>> Chris B >>>> >>>> _______________________________________________ >>>> Leica Users Group. >>>> See http://leica-users.org/mailman/listinfo/lug for more information >>>> >>>> >>> >>> >>> -- >>> Cheers >>> Geoff >>> 'Licence to Chill' >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >> >> -- >> >> * Henning J. Wulff >> /|\ Wulff Photography & Design >> /###\ mailto:firstname.lastname@example.org >> |[ ]| http://www.archiphoto.com >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > > > -- > -- Cheers Geoff 'Licence to Chill'