Finally upgraded to the R7 for birding around the wetlands near my house here in Florida, but now my old glass is just not cutting it at all. Im struggling because the crop factor on the R7 is awesome for reach but it really shows the flaws in my current setup. I have about 800-900 bucks to spend max and I need something that wont weigh a ton since I walk a few miles every weekend.
I keep looking at the RF 100-400mm because its super light and fits the budget perfectly, but then I see folks on other forums obsessing over how you need prime lenses for sharpness. So I was thinking, is the 100-400 really enough for detailed feathers? I also checked out the Sigma 150-600 with an adapter, but honestly the idea of carrying that massive thing around in the heat makes me tired just thinking about it. My logic was that maybe I sacrifice a little bit of reach for portability, but I keep second-guessing if I'll regret not having those extra 200mm. Is the RF 100-400 actually decent for wildlife or am I gonna be frustrated the second I see a bird further than twenty yards away?
Honestly, grab the Canon RF 100-400mm F5.6-8 IS USM and dont look back. I take mine out on trails all the time and honestly, the weight difference between that and a 150-600 is life-changing. If you are walking miles in Florida heat, you will hate lugging a massive lens around after the first hour. I get the obsession with primes, but for birding with an R7, you actually get a ton of reach with that combo. The crop factor means you are essentially shooting at 640mm equivalent. Is it gonna be as sharp as a massive prime? No. But for the money, the clarity on feathers is surprisingly good. I have gotten some great shots of egrets and herons where you can still see the individual texture. Forget the Sigma. The adapter adds bulk, and the focusing speed on those older third-party lenses can be super finicky compared to native RF glass. If you keep your shutter speed up and use a decent tripod or monopod when you can, you will be fine. You really wont regret the weight savings when you are five miles into your hike. Just save your back and go with the 100-400, its a total no-brainer for the R7 imo.
I have been using the Canon RF 100-400mm F5.6-8 IS USM on my R7 for a few months now and it is definitely a capable piece of kit for the price. You have to be realistic about the f/8 aperture at the long end though. If you are shooting in deep shade or early morning, that ISO is gonna climb fast and introduce noise.
- The reach on an APS-C sensor is equivalent to 640mm which is plenty for most wetlands.
- Sharpness is surprisingly solid if you keep your shutter speed up and don't rely too heavily on cropping in post. Personally, I prefer the portability over carrying a heavy Sigma 150-600mm F5-6.3 DG OS HSM Contemporary with an adapter, especially in that humidity. Just make sure you learn to track well because you need to keep that subject sharp since you cant crop as aggressively as you would with a prime.
Man, I feel your pain. Florida heat is brutal when you are lugging gear. Reminds me of when my buddy tried to trek through the Everglades with a massive prime lens setup; he ended up dropping his whole bag into a shallow marsh when he slipped. It was a complete disaster, he spent three hours drying everything out.
- The humidity is killer.
- My gear always feels heavier than it actually is.
- Getting the shot is just exhausting.
