Picture Taker Loc: Michigan Thumb

I found Scan Disk great (888) 527-1441 or (800) 578-6007

PGHphoto Loc: Pittsburgh, PA

Did you compare the metadata on a good and a bad image ? Could be a camera setting changed at some point and everything after that point reflected a bad setup. If the shutter speed, ISO and Aperture are reasonably close, I would suspect the camera itself.

ralf Loc: NJ

Try adjusting exposure by +5stops in post. Just in case you made a mistake in exposure. I would not blame the SD card. Seems very unlikely.

mlkddk Loc: Colorado

I have multiple issues with all brands of SD cards. While the consensus is SD cards don't wear out, I just limit the times I use a card and then either exchange it or buy new. Solves the problem!

Beenthere

Save the good shots to your computer , and/or a B/U drive, then completely re-format the card. This very thing happened to me during my nephew's wedding. Fortunately I had a second camera. However not being one to quickly toss gear, I decided to save what I had and re-format. I've used that card since then with no problems. Remember, this is only one of other possible causes, or solutions.

TheShoe Loc: Lacey, WA

Perhaps the mirror was stuck and not flipping up out of the way of the sensor. Solution: Remove chewing gum from the interior of the camera.

abc1234 Loc: Elk Grove Village, Illinois

The reported exposures were consistent.

abc1234 Loc: Elk Grove Village, Illinois

Could be. I do not know if matters that I was in burst mode. Sorry but the gum stays. I need a way to cover the holes in the mirror box.

abc1234 Loc: Elk Grove Village, Illinois

I agree on reformatting and do it when I reuse a filled card.

abc1234 Loc: Elk Grove Village, Illinois

Good idea. The file just showed a lot of blue and green noise and no hint of an image.

Eric2018 Loc: Los Angeles, CA, USA

By that, do you mean that the "good" images were taken with one lens, then you changed lenses, and the "black" images were all taken with that lens on the camera? If so, and given that you say the lens that gave the black images has worked fine before and after, I think you may be on to something in thinking perhaps you didn't get the lens mounted correctly. But -- you might also check all of the contacts, lenses and camera, to see if you can spot any that might be loose or worn.
Does anyone around here know how the metadata are recorded to the SD card? Is it based solely on the settings, and independent of what the camera actually did? Would a bad contact on the lens in question have caused it to stop down to its smallest aperture, or interfere with the shutter action?
It sure seems that, if the SD card is OK, the only way to get totally black frames is if the shutter didn't open at all. Could that happen with your camera even if the mirror flopped out of the way? If so, you might not have noticed any different sound or feel, but no light reached the sensor.
Based on your description, it doesn't sound like you were using flash, but if so, it could be a synchronization problem. And if the flash simply didn't fire, then (a) that should have shown up in the metadata, and (2) the images probably wouldn't be black, just majorly underexposed.
A LONG time ago I earned a few extra dollars in college photographing couples at fraternity and sorority events. I was justifiably paranoid that the 35mm film hadn't "caught" and wasn't advancing, so I got in the habit of constantly checking to be sure the rewind knob turned each time I cocked the shutter for the next shot. Fortunately, I never got hit with the dreaded blank film, but that old habit refuses to die, and something in me takes subconscious notes of little details that sometimes alert me to problems in time to correct them before it's too late.

abc1234 Loc: Elk Grove Village, Illinois

A lot of good ideas and questions. I used both lenses for the good images. The bad ones were with one lens only. No flash. I do not know how the camera records the metadata but it is unique for each image. Since the pictures were shot in burst mode, I tried that right now and the shots were good. At this point, I think the card is ok and something wrong was wrong with the camera. I thought I did not seat the lens all the way in the mount. I tested the setup by rotating the lens back by about 30 degrees and the exposures were still ok.

I also had film cameras that cocked the shutter when advancing the film but you teach a good lesson there. I will go back to chimping the images more often.

Thanks for posting.

aellman Loc: Boston MA

Given the reputation of SanDisk, a large scale manufacturing error is virtually impossible.

Beenthere

But it does happen.., a SD card CAN go bad. It actually can be a manufacturing defect. I do, however, agree that it's "very unlikely" hence my suggestion to re-format. It worked for me. Hardware, like women.., you can't live with it, you can't live without it.

Picture Taker Loc: Michigan Thumb

Was ScanDisk called and what did they say?