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Iphoto

Go into Iphoto, Preferences and put "no application" for what should happen when camera is detected. It works the same for just an SD card.
 
You can also use Image Capture (in your Application folder) to tell which program to launch (or do nothing in your case) when different devices such as an iPhone, P&S camera, SD card etc connect to your Mac.
 
The point is I am using lightroom. and every time i insert the SD card the iPhoto pops up. and I do not want to delete iPhotos cause my kids use it sometimes
 
Haaaaaaaaaa. I fixed it.
Open Image Capture
connect your camera or insert your memory card
once it pops in the image capture there will be a tiny arrow on lower left corner. hit it.
choose whatever program you want or hit other for more.
now SD card opens lightroom
 
Excellent! I had the same problem (after installing Yosemite), and this worked for me.

In my case I selected "No Application." That way it doesn't always open Lightroom when I stick the card in (I don't always want it to open). But if I already have LR open when I stick in the SD card, the LR importer opens automatically. Perfect!
 
Excellent! I had the same problem (after installing Yosemite), and this worked for me.

In my case I selected "No Application." That way it doesn't always open Lightroom when I stick the card in (I don't always want it to open). But if I already have LR open when I stick in the SD card, the LR importer opens automatically. Perfect!

There's no "no application", in the pulldown list for me in image capture. You have to pic something that the SD card, which the OS identifies as a camera, will open. Actually you can pick anything that you can navigate to, so I picked my user name :confused:

Then I ejected the SD card, quit image capture, re-inserted the SD card and NOTHING HAPPENED, which is what I want. I don't want SD cards to make anything happen, no iPhoto no Lightroom no nothing.

So problem solved for me :D
 
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