Exodies Posted August 11, 2015 Share #1 Posted August 11, 2015 Advertisement (gone after registration) Sitting in a cafe, I idly took two pictures, one with Super-Elmar-M 1:3.4/21 ASPH. and the other with Apo-Summicron-M 1:2/50 ASPH. I just wanted to record the colours of the tent but the results were very different. The scene was very HDR so exposure was not good. Both snaps were developed in LR, have the same colour temp and tint settings and have been cropped from about the middle of the DNG. With the SEM the tent was much brighter so I reduced the exposure (in LR); highlights were blown but not on the tent. On the first image you can see that the yellow panel becomes its correct red where it is in the shade at the bottom so I suppose some kind of flooding has taken place. 21 lens Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! 50 lens What have I done wrong? Thanks for your help to explain this. Oh, and I can assure you it's not a spinning top... Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! 50 lens What have I done wrong? Thanks for your help to explain this. Oh, and I can assure you it's not a spinning top... ' data-webShareUrl='https://www.l-camera-forum.com/topic/248846-different-lens-different-colours/?do=findComment&comment=2870074'>More sharing options...
Advertisement Posted August 11, 2015 Posted August 11, 2015 Hi Exodies, Take a look here Different lens, different colours. I'm sure you'll find what you were looking for!
jaapv Posted August 11, 2015 Share #2 Posted August 11, 2015 Well, a difference in exposure will create a difference in colour, and different lenses will have different colour renderings, despite the lens makers trying to harmonize their range with coatings. Link to post Share on other sites More sharing options...
earleygallery Posted August 11, 2015 Share #3 Posted August 11, 2015 Were the exposures identical? I suspect not, hence the difference. Link to post Share on other sites More sharing options...
tobey bilek Posted August 11, 2015 Share #4 Posted August 11, 2015 Were the exposures identical? I suspect not, hence the difference. If exposures were not the same, results will be different. Not to disparage you, but digital images can only be manipulated so far. Camera setting may have been the same, but the top exposure is more because the light changed. Look at the white building in the background. Maybe a cloud shaded the tent in the bottom. Leica makes great effort to keep the lenses the same and they are very successful. Take your two and photograph something neutral and measure the RGB colors in LR or PS. Color casts will easily show and that is what is different between lenses. Link to post Share on other sites More sharing options...
earleygallery Posted August 11, 2015 Share #5 Posted August 11, 2015 If exposures were not the same, results will be different. Yes, that's my point. Link to post Share on other sites More sharing options...
Exodies Posted August 11, 2015 Author Share #6 Posted August 11, 2015 Thanks! The exposures were not identical, about two stops over on the SEM. So I need to learn to expose properly. I use classic metering on the 50mm, this kept the bright centre under control. I use Multi-Field metering with the SEM. As this scene has the brightest part in the middle I suppose it doesn't match the multi-field algorithm's assumptions. Checking the histogram would have been useful. I forget why I switched from centre weighted to multi-field. I'll work on this tomorrow although we're having some fierce sun these days; temperatures in the thirties. Link to post Share on other sites More sharing options...
CheshireCat Posted August 12, 2015 Share #7 Posted August 12, 2015 Advertisement (gone after registration) In the tent, the red panel rendered orange/yellow in the 21mm shot means that green and/or red is clipping. Check the histogram for the different color channels. Link to post Share on other sites More sharing options...
algrove Posted August 12, 2015 Share #8 Posted August 12, 2015 No problem here just a typical beginner mistake. Link to post Share on other sites More sharing options...
Exodies Posted August 12, 2015 Author Share #9 Posted August 12, 2015 What a relief. I thought I'd be stuck with the problem forever. Link to post Share on other sites More sharing options...
CheshireCat Posted August 12, 2015 Share #10 Posted August 12, 2015 Right, but can you check per-channel histograms and let us know if the diagnosis is correct ? Link to post Share on other sites More sharing options...
Exodies Posted August 13, 2015 Author Share #11 Posted August 13, 2015 I opened the original in Photoshop, selected a false-yellow part of the tent and grabbed the histogram. Here is the sample and the chart, Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! The red has gone overboard. Here's the histogram of the whole scene Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! The red has gone overboard. Here's the histogram of the whole scene ' data-webShareUrl='https://www.l-camera-forum.com/topic/248846-different-lens-different-colours/?do=findComment&comment=2870850'>More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.