Q: my iPhone photo album is full, if i delete will it delete off my photo stream on imac

My iphone 5 wont take any more photos as its full of photos, if i delte them all will they also delete automatically off my IMac photo stream?

If you delete photos from your camera roll or saved pictures, they will stay in the PhotoStream, only if you delete from the Photo Stream will they be removed from iCloud and all streams on all devices, see this link:  iCloud: How to delete photos from Photo Stream

But the photos are not save, if they are only in the Photo stream. They will be automatically removed after a month, see:  iCloud: Photo Stream FAQ

So you need to import them on your iMac from the Photo Stream to store them locally.

Regards

Léonie