When Apple announced that Aperture was no longer going to be developed and Photos in 10.10 will replace it, Adobe came and said that it is working on a migration tool for Aperture users. Apple has stated that Photos will offer more features and controls than iPhoto, but if it will meet the needs of Aperture users remains to be seen. Adobe has posted their first guide to the migration process to Lightroom. So if you can’t wait for them to finish the migration tool they are working on, you can follow this guide.