Just saw this thread and honestly, you dont need to spend your whole $500 to get professional results. Building on the earlier suggestion, the Canon EF 50mm f/1.8 STM is the most logical starting point for any 90D user. It is incredibly affordable, usually under $130, and handles that blurry background perfectly. Since the 90D has a crop sensor, this glass acts like an 80mm lens which is basically the sweet spot for portraits. If you want to use the full budget for something more substantial, the Canon EF 85mm f/1.8 USM is a solid step up. It offers better reach and smoother bokeh for outdoor shots. Another practical tip: look for a used Sigma 30mm f/1.4 DC HSM Art for Canon EF-S if you plan on shooting in tighter indoor spaces. Youll save enough money that way to maybe grab a basic flash too.

^ This. Also, you really need to consider the physical space you'll have at the party. On a crop sensor like the 90D, an 85mm lens is very tight indoors. You'll likely find yourself backed against a wall trying to fit people in. The Sigma 30mm f/1.4 DC HSM Art is a much more practical choice for indoor events. Its a solid build and gives you that professional depth of field while still being wide enough for group photos. I've found it helpful to use the lens simulator on the Canon website or look at the sample galleries on DPReview before buying anything. If you want to save money, check the used stock on MPB or KEH. You could probably pick up both the Sigma and a Canon EF 50mm f/1.8 STM for under your $500 limit. Having both focal lengths gives you much better coverage for the graduation shots and the family party afterward.

Just found this thread. I have been very satisfied with how the 90D performs when switching to fast primes. You can definitely get that professional look for way under your $500 limit.

• The Canon EF 50mm f/1.8 STM is basically a requirement; its cheap and the background blur is miles better than any kit lens.
• If you have some space to move, the Canon EF 85mm f/1.8 USM offers even better subject separation for those graduation headshots. Quick tip for the party: set your shutter speed to at least 1/160. Even with a wide aperture, you dont want motion blur from people talking or laughing to ruin the sharpness. Those two lenses will give you exactly what you need by Saturday.

I felt the same way when I started with my 90D. I was really worried about wasting money, but I finally got a prime lens and im so happy with it. It works well for my kids portraits and ive got no complaints... basically changed everything. Are you mostly shooting these graduations indoors where space is tight, or will you be outside with plenty of room?

TIL! Thanks for sharing