Memory card reader

What model is the Nikon camera?

Exactly what does it say on the camera cards?

Try plugging the camera into the iMac using the Nikon supplied USB cable?

see > Import photos from a camera or phone using Photos on Mac - Apple Support

If those are SD cards, then you can plug them directly into the SD card reader on the back of your iMac.

If not, then you can get and use a USB card reader that supports that type of camera card.

The 2017 iMac has a memory card reader in the lower right hand corner (as you face the screen) just to the right (again as you face the screen) of the various cable ports:

You should be able to insert the card in it and have it show up on the Desktop. Then open it us and look for the folder holding the image files.

Old Toad wrote:

The 2017 iMac has a memory card reader in the lower right hand corner (as you face the screen) just to the right (again as you face the screen) of the various cable ports:

that is an SD card slot. the OP asked about Compact Flash (CF) which are quite different than SD cards.

spookymay53 wrote:

Unfortunately the camera was ruined because it sat with batteries inside for at least 7 or 8 years and they were so corroded I could not dig them out.

Ouch. How many of us have done the same thing, i.e. forgetting to take batteries out of devices when putting them in long term storage. I had one corrode just after 8 months.

Have fun with the ol photos and memories.

this card reader reads CF cards (plus other types) and is Mac compatible:

https://eshop.macsales.com/item/Sabrent/HBMACR/

OOOOPS, there goes another rubber tree plant.

you're welcome. :)

Perhaps an sd converter?

[Link Edited by Moderator]