sparkie Posted March 21, 2007 Share #1 Posted March 21, 2007 Advertisement (gone after registration) What are thoughts on this image. Do you think the colours look natural or a bit flat? Was shot with CV15 with no IR Cut filter and processed in Lightroom trial. Before processing there was very noticeable cyan in the borders. I only thought cyan drifting was evident when using IR Cut filters. Do you expericence cyan drifting when not using IR filters also? Thoughts and comments appreciated. TIA Link to post Share on other sites More sharing options...
Advertisement Posted March 21, 2007 Posted March 21, 2007 Hi sparkie, Take a look here M8 Colour & CV15 / cyan drifitng without IR cut filters. I'm sure you'll find what you were looking for!
sparkie Posted March 21, 2007 Author Share #2 Posted March 21, 2007 here's the unprocessed image showing the cyan in the borders.. Link to post Share on other sites More sharing options...
sparkie Posted March 21, 2007 Author Share #3 Posted March 21, 2007 sensor melting? (i should mention this is the models hair tie thingy which had diamond clusters, and i think the sunlight was reflecting off this) Link to post Share on other sites More sharing options...
Guest guy_mancuso Posted March 21, 2007 Share #4 Posted March 21, 2007 What i see is vignetting in the corners that is normal from a CV 15 lens and that is motion blur plain and simple. Nothing wrong here just stop that CV to F8 or f11 and that vignetting will be reduced more. It does not look flat either nice contrast between couch and highlights Link to post Share on other sites More sharing options...
LJL Posted March 21, 2007 Share #5 Posted March 21, 2007 Exactly. LR has gone in and "brightened" the highlights a bit, thus pulllng out the vignetting that you see without adjustment. The apparent cyan cast is most likely due to the cooler light from the daylight source. Also agree with Guy that the other is pure motion blur from the longish exposure. As an aside, the image itself is interesting, and has the look of older shooting style (slower shutter speeds) in a more modern setting with the subject zipping on through the frame, to some degree. Nice comp. LJ Link to post Share on other sites More sharing options...
tashley Posted March 21, 2007 Share #6 Posted March 21, 2007 Exactly. LR has gone in and "brightened" the highlights a bit, thus pulllng out the vignetting that you see without adjustment. The apparent cyan cast is most likely due to the cooler light from the daylight source. Also agree with Guy that the other is pure motion blur from the longish exposure. As an aside, the image itself is interesting, and has the look of older shooting style (slower shutter speeds) in a more modern setting with the subject zipping on through the frame, to some degree. Nice comp. LJ I think the colours are fine. Did you know, BTW that Lightroom's Vibrance slider is more subtle than the Saturation one? Very useful. The CV does best at the half-stop between 5.6 and 8. I also sometimes get mild cyans without filter - but with filters, it's like a cyan hallucination! Tim Link to post Share on other sites More sharing options...
sparkie Posted March 21, 2007 Author Share #7 Posted March 21, 2007 Advertisement (gone after registration) here's a version with slightly more saturation. which do you prefer the 1st image or this one? Link to post Share on other sites More sharing options...
sparkie Posted March 21, 2007 Author Share #8 Posted March 21, 2007 What i see is vignetting in the corners that is normal from a CV 15 lens and that is motion blur plain and simple. Nothing wrong here just stop that CV to F8 or f11 and that vignetting will be reduced more. It does not look flat either nice contrast between couch and highlights thanks for the reply. these were shot between f4.5 and 5.6. never stopped down further otherwise the motion blur would have been too 'blurred'. will try f8 or 11 next time. just wasnt sure when diffraction kicked in with this lens Link to post Share on other sites More sharing options...
sparkie Posted March 21, 2007 Author Share #9 Posted March 21, 2007 Exactly. LR has gone in and "brightened" the highlights a bit, thus pulllng out the vignetting that you see without adjustment. The apparent cyan cast is most likely due to the cooler light from the daylight source. Also agree with Guy that the other is pure motion blur from the longish exposure. As an aside, the image itself is interesting, and has the look of older shooting style (slower shutter speeds) in a more modern setting with the subject zipping on through the frame, to some degree. Nice comp. LJ Thanks for the compliment LG. I think your analysis on the cyan cast is spot on. That it is due to the daylight source rather than the lens itself (though I'm not sure what caused this blueish effect, seems out of place) as other shots with this lens didnt yield such a cyan cast, they were more grey vignetting with the very slightest tinge of cyan. On the back of the screen when i reviewed this shot and zoomed in on the hair tie it looked like tim's sunset melt shot in that the pixels were 'hard pixels'. but when processed they were softer, and part of the image. so guy and you are right that its a very bright reflection but it didnt actually cause sensor overspill. I have not testing by shooting in halogens or the sun yet Link to post Share on other sites More sharing options...
LJL Posted March 21, 2007 Share #10 Posted March 21, 2007 I agree with Tim that the CV 15 really hits its stride at f6.3. It is very usable at f5.6 and f8 also, but it seems to perform best around f6.3 for most of the shooting I have done with it. I did try some stuff at f11 and thought I was starting to see some diffraction starting to effect the inherrent sharpness of the M8 images. I will keep playing with things if I ever get my camera back from Solms! (Sorry for that rant, but 8+ weeks now and I am trying not to get to steamed up.) LJ P.S. Sparkie, the slight boost in saturation on the last post is very subtle, from what I can tell. Either looks o.k., to my eye right now. Link to post Share on other sites More sharing options...
sparkie Posted March 21, 2007 Author Share #11 Posted March 21, 2007 I think the colours are fine. Did you know, BTW that Lightroom's Vibrance slider is more subtle than the Saturation one? Very useful. The CV does best at the half-stop between 5.6 and 8. I also sometimes get mild cyans without filter - but with filters, it's like a cyan hallucination! Tim Thanks for the tip Tim, this is the first time i have used lightroom (MUCH better than CS2 RAW) and still blindly bumping into its features Thats what i wanted to hear! – that there was 'some' residual cyan without filter, but it must be shocking with one. Yipes! Link to post Share on other sites More sharing options...
sparkie Posted March 21, 2007 Author Share #12 Posted March 21, 2007 Here's another shot. Do you think the skin-tone is ok? I think lightroom automatically adjusts the sliders, i have to go back and check. This image definitely isn't flat. Its strange I'm getting saturation inconsistencies. I didn't even touch the saturation slider on this! Link to post Share on other sites More sharing options...
wparsonsgisnet Posted March 21, 2007 Share #13 Posted March 21, 2007 Regarding difraction, I have noticed that the M8 does not like my Leica lenses at f11 or smaller. At f8, they're still ok. This is for tripod-mounted camera at 1/250, so it's not shake. Is the 1.33 factor enlarging the COC? Link to post Share on other sites More sharing options...
sparkie Posted March 21, 2007 Author Share #14 Posted March 21, 2007 Thanks LJ (& tim) for the tip. I'll try it next time! i figured f11 and beyond and you might be risking diffraction problems the second version has more saturation (visible side by side) and more dynamic range hope you get your M8 back soon Link to post Share on other sites More sharing options...
LJL Posted March 21, 2007 Share #15 Posted March 21, 2007 Sparkie, Not sure how LR does its corrections. You should be able to turn off the auto corrections in the preferences, like you can in ACR. (I do not use LR, so I really cannot comment too much on how it does what.) As for skin tones in this image......I think they look a bit oversaturated and reddish, personally, but that point is almost moot when you consider you are working with a blur that conveys shape more than detail. Any auto settings would struggle a bit here, as you have a significant portion of the image with very muted light tones, so the tendency would be to boost saturation and even contrast to get to something more "normal". Not sure that is needed here, as the subtle seems to play better, in my opinion. LJ Link to post Share on other sites More sharing options...
robsteve Posted March 21, 2007 Share #16 Posted March 21, 2007 The CV 15mm is sharpest between f5.6 and f8. I have confirmed this with testing and it is also shown on the MTF curves for this lens. Link to post Share on other sites More sharing options...
robertwright Posted March 21, 2007 Share #17 Posted March 21, 2007 i would think that whatever Ir filtration the M8 has internally is what is causing the cyan corners, and the reason you are seeing it is because the cv15 exit pupil is so close to the sensor, and the angle of incidence is steep, and inducing the red absorbtion. Am I wrong? Link to post Share on other sites More sharing options...
sparkie Posted March 22, 2007 Author Share #18 Posted March 22, 2007 Bill - whats COC ? LL - what raw processor are you using? thanks for your comments. yes, i think the skin tone is a touch too 'cooked'. but the balustrade is just right tone and colour wise. maybe the i've got to tweak the curves a bit for skin tones. hmm, where do i start Robert - sorry i dont know the answer to your hypothesis. its way beyond my technical knowledge! i'm sure someone here knows and will hopefully chime in Link to post Share on other sites More sharing options...
adan Posted March 22, 2007 Share #19 Posted March 22, 2007 Like Robert and Sparkie said - the C/V 15mm is wide enough that it encounters cyan drift or whatever you want to call it with just the weak internal IR filter of the M8. It's not terribly strong, but it IS there. I noted it in shots with a demo M8 as far back as November, when I posted this shot on this forum. Link to post Share on other sites More sharing options...
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