johnnymossville Posted July 2, 2014 Share Posted July 2, 2014 Which one has the best dynamic range? In the comparison, it seems to assume both GH4 and A7S have same dynamic range. The one video I've seen comparing the two side by side show very similar DR. Quote Link to comment Share on other sites More sharing options...
Michael1 Posted July 2, 2014 Share Posted July 2, 2014 The one video I've seen comparing the two side by side show very similar DR. A lot of people suspect this video is fake. Michael Quote Link to comment Share on other sites More sharing options...
johnnymossville Posted July 2, 2014 Share Posted July 2, 2014 hey I saw it on the internet it has to be true. :) Quote Link to comment Share on other sites More sharing options...
Michael1 Posted July 2, 2014 Share Posted July 2, 2014 Stops are exponencial, 1 stop more is 2 times the light, 2 stops is 4 times the light. The difference between FF an m43 is 2 stops, if you get a 0.5 speedbooster the difference will be 0. That would assume 0 transmission loss through the Speed Booster, and that you could get a 0.5 Speed Booster. The ones I have seen for M 4/3 have been closer to 0.7, and one stop. I've never seen any measurements as to what the losses actually are. Michael Quote Link to comment Share on other sites More sharing options...
Michael1 Posted July 2, 2014 Share Posted July 2, 2014 hey I saw it on the internet it has to be true. :) LOL Cheers! Michael Quote Link to comment Share on other sites More sharing options...
rak_heri Posted July 2, 2014 Share Posted July 2, 2014 The one video I've seen comparing the two side by side show very similar DR. I'm a bit lost. The big highlight of A7S was big large pixels (instead of 36MPx on Sony A7R). If DR is similar too GH4 which has finer pitch and also smaller sensor, what does the A7S has, apart from low ISO? Where are the 15+DR advertised? Quote Link to comment Share on other sites More sharing options...
johnnymossville Posted July 2, 2014 Share Posted July 2, 2014 I'm a bit lost. The big highlight of A7S was big large pixels (instead of 36MPx on Sony A7R). If DR is similar too GH4 which has finer pitch and also smaller sensor, what does the A7S has, apart from low ISO? Where are the 15+DR advertised? simple answer, I think we have to see more tests. Quote Link to comment Share on other sites More sharing options...
jcs Posted July 2, 2014 Author Share Posted July 2, 2014 DXOMark reports GH4 at 12.8 and the A7S at 13.2, so a .4 stop advantage to the A7S. The flower video above could be real- the DR is very close between the cameras. Quote Link to comment Share on other sites More sharing options...
Jacek Posted July 2, 2014 Share Posted July 2, 2014 I'm a bit lost. The big highlight of A7S was big large pixels (instead of 36MPx on Sony A7R). If DR is similar too GH4 which has finer pitch and also smaller sensor, what does the A7S has, apart from low ISO? Where are the 15+DR advertised? Maybe they changed their mind? Instead of high DR @ ISO100 (like most rivals) thay did good DR @ ISO100-25000 The same with Color Sensitivity according to dxomark. So instead of 15 stops DR @ ISO100 and unusable ISO>3200 you have 13 stops DR @ ISO 100 and still nice 9-10 stops DR @ ISO 12000 (the same with color sensitivity) [GH4 perfoms like that @ ~ ISO 1200] Quote Link to comment Share on other sites More sharing options...
jcs Posted July 2, 2014 Author Share Posted July 2, 2014 I revealed the answer to which camera was used for this shoot (originally planned for the A7S): '?do=embed' frameborder='0' data-embedContent>> When I received the A7S shipping notice last week, we planned a shoot for Saturday. The camera was due Friday however apparently Sony(?) stopped B&H from shipping the cameras early; ours never made it out of the warehouse. B&H was kind enough to ship it out overnight at no charge on Monday. This review was from a few hours working with the camera. My co-director-producer Elena loves the GH4 skin tones, as did our model. Elena never liked the FS700 (Sony) skin tones (and loves the 5D3 skin tones the best). I agree with them and feel that the A7S, once the proper settings are found (not using Slog2!) and likely one of the cine settings with natural color in-camera, will be a useful tool in the toolbox, especially for low light and/or more shallow DOF shots (I'm still waiting for the EF to m43 active SpeedBooster to come out). It's really important to shoot people and skin tones to see how accurate a camera's color science is. Human beings are very well evolved to detect when skin tones are wrong or 'off', probably related to evaluating health (related to survival and reproduction). Quote Link to comment Share on other sites More sharing options...
jcs Posted July 2, 2014 Author Share Posted July 2, 2014 We're very happy with the skin tones and 4K footage we get with the GH4 in studio lighting on a green screen: Quote Link to comment Share on other sites More sharing options...
jcs Posted July 2, 2014 Author Share Posted July 2, 2014 ">They do GMaximus 1 Quote Link to comment Share on other sites More sharing options...
GMaximus Posted July 2, 2014 Share Posted July 2, 2014 Which one has the best dynamic range? In the comparison, it seems to assume both GH4 and A7S have same dynamic range.DXO Labs test result:We have to keep in mind that if we shoot slog2, the base iso is 3200, so in bright conditions a7s loses lots of DR compared to GH4 or itself. Quote Link to comment Share on other sites More sharing options...
noone Posted July 2, 2014 Share Posted July 2, 2014 DXO Labs test result: We have to keep in mind that if we shoot slog2, the base iso is 3200, so in bright conditions a7s loses lots of DR compared to GH4 or itself. What I like is that the A7S still has almost 10 stops at ISO 6400 and is maybe the only camera with at least 10 stops at ISO 3200 in Dxo's data base. It is starting to look to me that while maybe designed as a hybrid with a video focus, it is getting rave reviews for stills but less than that for video. It is/will seemingly take a hit from many people because it may not do 15+ stops of DR except under very specific circumstances (maybe) but ignoring that it will still have a higher DR than any camera near its price at ISO 1600 and up. For live music, I am seriously considering replacing my A7 with an A7S for stills and the video will be better as well and good enough for me (since it will mostly be covers that I can't show anyway). gelaxstudio 1 Quote Link to comment Share on other sites More sharing options...
jcs Posted July 2, 2014 Author Share Posted July 2, 2014 Doing lower light tests with the GH4+Voigtlander 25mm @F.95 and the A7S with Canon 50mm F1.4 @ F2 (fairly equivalent in terms of FOV and DOF), the A7S does much better with noise control vs. the GH4 (as expected), however the GH4 does surprisingly well. In lower light shooting, the GH4 noise does go from nice monochromatic to colored, similar to the A7S (which is much less and better controlled). The GH4 is looking more detailed (4K => 1080p) and clear in bright light. The A7S is clearly better in low light; shooting handheld is tricky as rolling shutter is 30.5ms (vs 20.5ms for GH4 in 4K (13.7ms in 1080p)): http://www.dvxuser.com/V6/showthread.php?303559-Measuring-rolling-shutter-put-a-number-on-this-issue! Jacek 1 Quote Link to comment Share on other sites More sharing options...
Jacek Posted July 2, 2014 Share Posted July 2, 2014 Doing lower light tests with the GH4+Voigtlander 25mm @F.95 and the A7S with Canon 50mm F1.4 @ F2 (fairly equivalent in terms of FOV and DOF), the A7S does much better with noise control vs. the GH4 (as expected), however the GH4 does surprisingly well. In lower light shooting, the GH4 noise does go from nice monochromatic to colored, similar to the A7S (which is much less and better controlled). The GH4 is looking more detailed (4K => 1080p) and clear in bright light. The A7S is clearly better in low light; shooting handheld is tricky as rolling shutter is 30.5ms (vs 20.5ms for GH4 in 4K (13.7ms in 1080p)): http://www.dvxuser.com/V6/showthread.php?303559-Measuring-rolling-shutter-put-a-number-on-this-issue! Finally direct GH4 vs A7S test.. Oh! Thanks! Do you know You will get millions of clicks if you publish it? ;) Please do also DR test (extreme scene and GH4@100 , A7S@100, A7S@3200log2) and we will be happy as children.. Quote Link to comment Share on other sites More sharing options...
Guest Ebrahim Saadawi Posted July 3, 2014 Share Posted July 3, 2014 Thank you, JCS Please if you have the time, do a Dynamic range test and post it here. Just a small clip looking outside a window at the same exposure settings,... Side by Side ISO test would be greatly appreciated too! Quote Link to comment Share on other sites More sharing options...
johnnymossville Posted July 3, 2014 Share Posted July 3, 2014 Holy Rolling Shutter Batman. The A7S doesn't fare well even in 1080 in that dvxuser forum thread. I wonder if 4k will be even worse. Quote Link to comment Share on other sites More sharing options...
Guest Ebrahim Saadawi Posted July 3, 2014 Share Posted July 3, 2014 rolling shutter is 30.5ms (vs 20.5ms for GH4 in 4K (13.7ms in 1080p)): http://www.dvxuser.com/V6/showthread.php?303559-Measuring-rolling-shutter-put-a-number-on-this-issue! Ouch! That's D90 levels (i.e., almost unusable without a tripod if I remember that camera correctly) Quote Link to comment Share on other sites More sharing options...
johnnymossville Posted July 3, 2014 Share Posted July 3, 2014 on the plus side, I bet slo moving interviews shot in the dark of night with no lights will look fantastic. OK I'm being sarcastic. forgive me. Quote Link to comment Share on other sites More sharing options...
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