CanadaMark wrote:
Even though Canon had almost the exact same issue (assuming light leak or similar) with their $3,500 made in Japan 5D III, I predict this will be made into a much larger issue because it's a Nikon and made in Thailand. Don't worry, if it becomes a widespread issue, we'll get our free piece of black tape too .
The manufacturing site is irrelevant if there is a design defect. Nikon should test for light leaks more thoroughly. It's been a basic weakness of cameras for over a hundred years.
JBPhotog wrote:
Um yes it does, you just need a bit more experience with lens flare. Focal length, light axis and f-stop all play a role and it isn't the same for each lens.
You didn't actually watch the video examples did you. That is not how lens flare works.
JHerr wrote:
You didn't actually watch the video examples did you. That is not how lens flare works.
Really? Ah yeah I did and I have experienced flare with hard horizontal lines. It all depends on the angle of incidence on the lens from the light source. Before any conclusions can be drawn(typical interweb speculation) proper testing must take place and be documented and replicated.
JBPhotog wrote:
Really? Ah yeah I did and I have experienced flare with hard horizontal lines. It all depends on the angle of incidence on the lens from the light source. Before any conclusions can be drawn(typical interweb speculation) proper testing must take place and be documented and replicated.
Horizontal flare still has a full round flare source - it doesn't have an obscured flare as if its hidden behind something straight.
Let's not start a war of words because there is no material gain or loss for winning or loosing.
All of us here are trying to figure out what caused the symptoms which was initially classified as light leak. But as time goes by with more available information, things seems to show it might be something else.
Let's use what variables we were given by those who owns the camera and apply the best method in the industry for identifying the problem. The method is known as Process of Elimination used in the aircraft industry for air crash investigation. Remembered that there could be more than a single cause for most of the air crashes , so our problem here is no exception.
1) initially the problem was thought to be light leak, but after someone tested it with a lens cap on and found that there were none.
We can now dismiss this as a possible cause.
2) next we have flares, there are many kinds of flares: lens flares, flares caused by internal reflection which could be of any shape and size. Here we have users who have tested it with and without lenses, wide and telephoto. The issue was found with wide angle lens but not with telephoto, and it was also found without a lens.
So the lens can be a source. I will go into this further later.
3) then we have the edge of the focusing screen that might have caused the problem. As one of the user have noticed that it only happened using LV and not with the VF, the next thing is it was also on still photos. Both of these happened with the reflex mirror in the up position, which means that there is no possibility that the focusing screen can cause it, because it will be completely blocked by the mirror and the rubber damper at the edge of the mirror box.
So the focusing screen can be ruled out.
4) let's concentrate on just the mirror box with the mirror in the up position as in LV or picture taking mode. Here we have eliminate the lens, the focusing screen, and what we are left with is just the blackened mirror box and the shutter behind. Remembered that one of the user said that he encountered the problem without the lens.
Now! What do we have here? A blackened mirror box, a secondary reflex mirror sitting behind the primary mirror in the up position, and the shutter.
We can rule out the blackened mirror box. But the edge of the secondary mirror can cause reflection if it is not sitting well or painted, and not only that, because it is sitting on top, whatever reflection it can produce can only be directed towards the lower section of the sensor, which means the top of the picture.
So some owners here must do a check to confirm or eliminate it. The best way to do it is in sensor cleaning mode with a flash light shinning from the very edge of the lens mount with a steep angle, and watch the reflection on the sensor surface. Also watch for inter-reflection caused by the AA filter.
5) finally the shutter. This might be a little tricky because no one other than Nikon knew exactly how it should work. Initially I thought that the timing sequence could play a part in this because of the dark band found on top of the pictures which looks like one of the shutter plate caused by information recording of the sensor was either too early or too late with respect to the 1st or 2nd shutter. But then I recalled that the D750 has an electronic 1st shutter for video. Could this be another cause? Now the timing sequence is something new and critical and Nikon does not have as much of expertise as Panasonic, Sony or Canon do on video.
Like I said let's not start a war of words but just add to the discussion and hopefully we are able to come to a conclusion and help to resolve this issue, so that all those owners of this camera can enjoy their photography.
Not sure who started a war of words, but anyway, someone on dpreview is investigating the problem a bit deeper and may or may not be on to something, I can't say, see here
Not pointed at any particular person, but because a lot of discussions ended with one.
Yes, agree those are also possible causes, because it is also related to reflection.
EB-1 wrote:
The manufacturing site is irrelevant if there is a design defect. Nikon should test for light leaks more thoroughly. It's been a basic weakness of cameras for over a hundred years.
EBH
I know, I agree with you, but some people seem to think Japan is infallible in their manufacturing. My post was in reference to all the "here we go again" and "made in Thailand" comments made previously in the thread .
JHerr wrote:
Horizontal flare still has a full round flare source - it doesn't have an obscured flare as if its hidden behind something straight.
I am not trying to be argumentative but, you are incorrect in your conclusion. As I said earlier in a post, I have experienced this type of flare before. FTR, I have been shooting professionally for over 30 years and likely experienced more anomalies than the average shooter.
I respect your experience and extensive knowledge regarding the flare.
With all due respect; Have you experienced this kind of flare on Nikon 24-70, 35, 50 and on 85mm lenses? Is it possible to have this kind of flare on above lenses on some D750 but not all? Is it even possible to have this type of flare on only some Nikon bodies and not all?
Because some user as they have posted here that they did exactly as I mentioned above which does eliminate flare issues.
If a particular lens flares the way it's shown here, it would flare on every camera body it's used with. If a lens flares like that, how come we don't have users complaining of lens flare of such kind until it's used on d750?
JBPhotog wrote:
I am not trying to be argumentative but, you are incorrect in your conclusion. As I said earlier in a post, I have experienced this type of flare before. FTR, I have been shooting professionally for over 30 years and likely experienced more anomalies than the average shooter.
Okay for all you 'it's not flare it's got to be a light leak' people, here you go. And I promise I won't say I told you so, oops!
Camera: Nikon D810
Lens: Nikkor AF-S 24-70 F2.8 - bare lens and no hood.
Set up was quick and dirty: Speedotron 102 bare bulb head on a stand, 250 watt model light only. Camera was pointed up so the head wasn't in the shot but the light source was right at the edge of the frame. Notice in all 5 focal lengths a hard flare line nearest the light source at the edge of the frame. Got the same with the 70-200 F2,8 VRII too. So hope this will enlighten those who have never seen hard edge flare before.
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