Which telephoto lens is best for Canon EOS R7 wildlife photography?

Question

so ive got this huge trip to the olympic peninsula coming up in like three weeks and im literally losing sleep over which lens to bring for my R7. ive been using the kit lens but obviously that isnt gonna cut it for eagles and marmots. im super torn between three options and my head is spinning.

rf 100-400mm (light and cheap but is 400mm enough?)

sigma 150-600mm with the ef adapter (extra reach but i heard it has focus pulsing)

rf 200-800mm (expensive and heavy and maybe out of stock everywhere)

my budget is capped at 1800 bucks so the rf 100-500 is way out of the question unless i sell a kidney lol. im mostly shooting in dense woods where the light is kinda crap so the f/8 or f/9 apertures on those longer zooms are making me really nervous about my iso speeds. if i go with the sigma am i gonna regret the weight and the adapter or should i just play it safe with the native 100-400 even if i have to crop in a ton? what would you guys do if you were in my shoes and needed the best balance of reach and speed for a trip like this?

newyorknewyork · Accepted Answer

Look, if you're hitting the Olympic Peninsula, you gotta be really careful about those apertures. I've shot in the Hoh Rainforest and the light there is practically non-existent under the canopy. An f/9 lens like the Canon RF 200-800mm f/6.3-9 IS USM is gonna force your ISO through the roof, and the R7 sensor starts getting noisy real fast once you move past ISO 3200. Tbh, shooting at f/9 in a dark forest is basically asking for blurry, grainy messes. I would suggest staying away from the Sigma too. The focus pulsing isn't just a rumor... it's a known issue with the R7 sensor and that specific third-party EF glass. It'll drive you crazy when an eagle finally lands and your lens just hunts back and forth. You dont want to miss a once in a lifetime shot because the autofocus couldn't keep up with the body. If I were in your shoes, I'd seriously consider hunting down a used Canon EF 100-400mm f/4.5-5.6L IS II USM and the Canon Mount Adapter EF-EOS R. You can usually find that lens for around 1300 bucks used, which leaves plenty of room in your budget. It's significantly sharper than the cheap RF 100-400 and that f/5.6 at the long end makes a massive difference in dark woods compared to f/8 or f/9. Just make sure to check the weather sealing and zoom ring for any grit before you buy. If the light still fails you, use the leftover cash for DxO PureRAW 4 to handle the high ISO noise. It's a lifesaver for R7 wildlife shots.

Ethan · Answer

> im mostly shooting in dense woods where the light is kinda crap so the f/8 or f/9 apertures on those longer zooms are making me really nervous The Canon RF 100-400mm f/5.6-8 IS USM is a decent option for the size. Even at f/8, the R7 autofocus stays snappy in most light... kinda shocked me tbh. The Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary for Canon EF has better reach, but its heavy and the pulsing is a known issue. Native glass is safer for this trip. Feel free to ask about settings!

FragmentedShadow · Answer

Honestly just search YouTube for R7 wildlife lens comparisons I had issues finding clear info here, unfortunately Those videos show the ISO performance way better than we can explain