Ira

I've noticed mirror slap on my D750. It happens on 1/30 or under, but occasionally happens on faster speeds. It is a vertical blur that you can see easily on 100% crop. It can be stopped by using Mirror Lock-up or Exposure Delay mode, which is essentially is the same, the camera locks up the mirror for 1, 2 or 3 seconds before it takes the shot. I was wondering if anyone else has had this issue.
I sent the camera back to Nikon for repair and I am waiting to see the result of their fix. The camera is out of warrantee at this point, so they charged me around $250 for the repair. I think it is a design flaw and they should have picked up the tab. Their latest firmware update addressed issues with mirror timing. This camera has been back to Nikon for the 2 recalls issued.
Attached are test images shot at 1/30 with a Nikon 70-200 on a tripod. I've repeated this test a number of times wth the same results. See attached photos. Zoom in and you'll see the vertical blur. I'll keep you posted.

No Exposure Delay

(Download)

3sec exposure delay

(Download)

MT Shooter Loc: Montana

Welcome to the world of full frame cameras, the mirror has almost 3 times the mass of the crop sensor models and mirror slap is well known and documented even going back to the very first SLR cameras. That is why the Mirror Up option is made available for slow shutter speeds.

Ira

They have been making SLR cameras for over 60 years, I would imagine they have the engineering figured out by this point. All I'm saying is that my D750 has shown to have extensive mirror slap. I have had Nikon cameras for many years. A Nikon F, a Nikkormat and may others. This is the worst I've had. Some cameras show more mirror slap then others.

jerryc41 Loc: Catskill Mts of NY

So the mirror timing update didn't help?

RWR Loc: La Mesa, CA

Photo #1 shows what to expect when one ignores the user’s manual. Photo #2 illustrates the value of following the manual’s recommendations (Page 109).

MT Shooter Loc: Montana

Ira

No, I have the latest firmware update. It didn't make a difference. I'll just have to wait until I get the camera back from Nikon. I'm hoping that they can fix it the first shot. They will warrantee the repair for 6 months. I'm willing to keep sending it back until the problem is solved. I have another camera body to use while it's gone.

Ira

I don't understand your issue with me calling out to the group about my camera, is an issue for you. I'm sure you don't want to hear anything negative about your D750. I think the D750 it is a great camera with some problems. Your reference to page 109 in the manual is to do with photo taking techniques. Your other reference to mirror size on a crop sensor compared to a full frame is moronic. Pentax has made 6x7 format slr camera for years with a mirror that is over twice the size of a full frame DSLR's mirror, using 120 film that was larger then Hasselblad's mirror due to the fact that the camera produced images that were in 8x10 ratio rather than Hasselblad's square format. That camera was very stable with little mirror shake. I would think that Nikon can make a full frame DSLR the has little mirror slap.

rook2c4 Loc: Philadelphia, PA USA

Maybe you have mirror foam erosion on your D750, which certainly can increase the effect of mirror slap.

Leitz Loc: Solms

Obviously!!

Ira

I hope that is all it is. That would be an easy fix for Nikon. This is an early D750, less then 4 years old. I wouldn't think that foam would wear so quickly. It is being worked on now. I'll keep everyone posted.