Photos keep seeing old pics as new, importing ad nauseum.

Added to that, is that if you are going to rely on your iCloud Photo Librar, you can stop physically importing your photos completely from your iPhone.

Yes right.

And for the times when you plug in your phone to your computer, you can stop the import notification from Photos by deselecting "Open Photos for this device"

Had the same issue.

Here is how I fixed it

Send the photos/videos to my mac via Airdrop, iMessage, etc.

Permanently delete them from my iPhone and the photos app.

Send them back and save the photos/videos and them reimport all new photos/videos.

The photos/videos will import for the last time. As they are reimported they will no longer be seen as new. Also the photos/videos are time stamped in the moments tab they will be sorted to its original place. But not in the camera roll, something I am not using.

What this is doing is giving them a new identity on the iPhone and the photos/videos is new for my iPhone, giving it another attempt to import properly.

Ugh! I have this problem too, only it happens with my Sony nex camera. For me, it is not just a few pictures, but several pics and videos as well. This causes a MAJOR issue because with the multiple duplicates of long videos, I end up running out of startup disk space. So, every time I try to download pics, I have to weed through old videos to make sure I'm only deleting the copies. It is a HUGE pain. I've uploaded the photos duplicates app to help, but it doesn't recognize any as duplicates.

Additionally, I just noticed that ones I recently downloaded were marked with a date of November of last year (11 months ago), so that is a horrible glitch as well, since it will mess with my ability to search photos.

Macbook Pro (15" mid 2015)

Yosemite 10.10.5

Photos Version 1.0.1 (215.65.0)

I'm rather late to this thread. However, I thought I'd share my experience with already imported photos that were not deleted from my iPhone 5C showing up as new photos next session of importing photos. This issue has been persistent since my old iPhone 4/10.6.8/iPhoto setup.

As I travel often and split my time between Asia and the US, I noticed that the already imported photos would start showing up after I changed time zones from the original photo timezone. By manually setting both the iPhone and MBPro times zones to the original timezone, then restarting each and connecting to iPhoto/Photos, the formerly imported photos no longer show in the import dialogue. However, any previously imported photos taken outside this timezone still show. It appears to me that Apple has failed to adequately ground all photos and database import data to a fixed GMT zone.

Perhaps my experience and observation is inconsistent with the issue as experienced by other users,. However, I suspect Apple has failed to arrive at a system for IDing files beyond some time stamps. Oddly, created and modified time stamps are inconstant between what's shown in Finder and what is shown in iPhoto/Photos photo info.

Me too, started after I did an attempted photos library merge.

Needed photos have been LOST.

I am having this problem with about 200 photos ranging in age. Very annoying

I have the same issue. I just try to remember which photos I've already imported each time I plug my phone in. I have about 40 that won't go away.

Oh man this actually worked! Thanks!!!