I just got my R7 and I am so hyped to take it out for some real wildlife shots but I am honestly spinning in circles trying to pick a lens. I'm heading out to Yellowstone in about six weeks so the pressure is on to buy something soon. I've been looking at the RF 100-400mm f/5.6-8 because it's so cheap and light and the reviews say the autofocus is snappy but then I worry about that f/8 aperture. Like if I'm trying to catch a bear in the brush at dawn is it just gonna be a grainy mess? My logic was that the R7 crop factor makes that 400mm behave like a 640mm which is awesome for reach but some people on the forums keep saying the RF 100-500mm L is the only real choice for this body. The problem is that lens costs like three times my $1600 budget and I really don't want to carry a brick around all day. I also saw some people using the old EF 100-400mm II with an adapter and they say it's sharper but then I'm adding bulk and a used one is still pricey. I just want something that wont hunt for focus when a bird moves. Is the budget RF 100-400 actually good enough for the R7 sensor or am I gonna regret not saving up for the big white lens...
- Grab the Canon RF 100-400mm f/5.6-8 IS USM.
- In my experience, its Nano USM is lightning fast for birds. ISO performance on the R7 handles f/8 diffraction limits surprisingly well.
Quick thought before you pull the trigger... honestly, be super careful with that f/8 aperture if youre chasing bears at dawn in Yellowstone. The R7 sensor is packed with pixels, which is cool for reach, but it gets pretty noisy when the light drops. If you stick with the Canon RF 100-400mm f/5.6-8 IS USM, you might find yourself struggling to keep shutter speeds high enough without the ISO going through the roof. I would suggest maybe hunting for a used Canon EF 100-400mm f/4.5-5.6L IS II USM and the Canon Mount Adapter EF-EOS R. Yeah, its a bit of a brick, but that extra stop of light is a lifesaver when the sun is barely up. You dont want your dream trip to be a bunch of blurry blobs. TL;DR: The light RF lens is okay for midday, but for Yellowstone wildlife, the older EF L-glass is the safer bet for low light.
I actually rented my current setup first. Tbh it helped me see what I could actually carry all day without dying. Maybe try some rental sites before you drop all that cash.
Huh interesting. I had no idea. The more you know I guess 🤷
> The problem is that lens costs like three times my $1600 budget and I really don't want to carry a brick around all day. ^ This. Honestly, everyone here is debating the technical specs of aperture vs. reach, but after shooting wildlife for years, the best gear is just the one you actually bring with you. When I started, I lugged around these massive, heavy setups that looked professional but just left me exhausted and grumpy by noon. I eventually sold them all for a lighter kit and my keeper rate actually went up because I wasnt shaking from fatigue or missing shots while fumbling with a tripod. People get so hung up on the L-series branding, but if you arent printing billboards, the difference is way smaller than the forums make it seem. Renting is a solid call like someone mentioned, just to see if the weight bothers you. Yellowstone is a ton of walking, so dont overthink the noise levels at dawn too much—you'll get plenty of shots even if you have to bump the ISO a little. Just enjoy the trip and keep your kit light enough to actually enjoy the scenery.
